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08/04/2024, 09:00
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Celine Peroux08/04/2024, 09:20
New observatories and advanced simulations are revolutionising our understanding of the cycling of matter into, through, and out of galaxies. In this talk I will provide an overview of the normal matter in collapsed structures, their chemical make-up and dust content. I will present fresh clues of the cosmic evolution of cold gas with cosmic times as well as its spatial distribution around...
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Ian McCarthy08/04/2024, 09:45
I will present results from the FLAMINGO suite of large-volume cosmological hydrodynamical simulations on the impact of baryons on various large-scale structure observables and its implication for the 'S8 tension'. I will also discuss the crucial role that independent measurements of the intragroup medium play and I will examine the consistency between various data sets (particularly, X-ray,...
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Smita Mathur08/04/2024, 10:10
The circumgalactic medium (CGM) plays a critical role in galaxy formation and evolution. The X-ray missions Chandra, XMM-Newton, and Suzaku opened a new window on CGM studies, allowing us to probe the warm-hot gas where most of the galactic baryons reside. In over two decades since the launch of Chandra and XMM-Newton, we have made great strides in understanding the CGM, but significant...
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Dylan Nelson08/04/2024, 11:05
We have certainly reached a consensus that galaxy evolution depends intricately on the cosmic baryon cycle. Inflows from the IGM meet outflows driven by feedback processes, creating the dynamic, multi-phase CGM. The physics of these gaseous halos, and the baryon cycle as a whole, are the key to understanding galaxy evolution. This is, however, a challenging regime for cosmological...
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Benjamin Oppenheimer08/04/2024, 11:30
I will present observational predictions of X-rays, FRBs, and 21-cm HI for the local circumgalactic medium from a variety of simulations. [Check back for a more complete abstract later.]
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Nicola Locatelli08/04/2024, 11:55
The first all-sky maps of high ionization lines observed in X-rays by eROSITA will provide an excellent probe for the study of the hot phase (T ∼ 10^6 K) of the Milky Way (MW) circumgalactic medium (CGM). In this work we analyse the OVIII line detected in the eROSITA data. We fit sky maps made in narrow energy bins around the lines, with physical emission models embedded in a 3D geometry to...
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Daniele Sorini08/04/2024, 14:00
Simulations indicate that stellar and AGN feedback processes significantly influence star formation and the distribution of baryons in the Universe. Despite this consensus, there is no agreement on the exact model for these processes. The Simba suite of hydrodynamical cosmological simulations (box size 74 Mpc, gas mass resolution 1.82X10^7 M_sun) includes variants with various stellar/AGN...
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Claude-Andre Faucher-Giguere08/04/2024, 14:25
I will review basic results on the virialization of the CGM, a key phase transition determining when the gas is expected to be hot vs. cold. The presentation will highlight recent insights from modeling cooling flows in galaxy-scale halos and the concept of outside-in virialization, in which the inner CGM is the last part of a halo to sustain a hot phase. Time permitting, I will summarize...
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Jonathan Stern08/04/2024, 14:50
A basic ansatz employed by studies of circumgalactic low/mid-ion absorbers is that they trace 'clouds' or 'mist' with minute filling fractions, embedded in a hot T ~ T_vir volume-filling medium. I will present evidence from cosmological and idealized simulations that this ansatz may be incorrect for absorbers with high equivalent widths (EW >~1 A). Such high EW absorbers instead trace a T <<...
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Akos Bogdan08/04/2024, 15:40
The circumgalactic medium (CGM) plays a pivotal role in every aspect of the formation and evolution of galaxies from the highest redshifts to the present day. While UV observations have made significant progress in mapping the warm gas around galaxies, the bulk of the baryons reside in the CGM in the form of tenuous, hot, X-ray-emitting gas. This hot gas can only be studied with X-ray...
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Joey Braspenning08/04/2024, 16:05
We use FLAMINGO, the biggest full hydro cosmological simulation ever, to study the most massive objects in the universe and do a direct comparison with observations. FLAMINGO hosts many tens of thousands of galaxy groups and clusters, in their full cosmological environment, making it an ideal testing ground to do a statistically relevant comparison with observations. Using a new forward...
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Ilaria Marini08/04/2024, 16:25
"Mapping the distribution of baryonic mass on large scales, specifically within group-sized halos, is vital to clarify how much of the missing baryons is locked up within halos and filaments. Thermal feedback, predominantly driven by AGNs residing in central galaxies, has been proposed to explain the observed amount and distribution of hot gas and overall baryonic content. However, the...
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Victoria Toptun08/04/2024, 16:45
Low-mass galaxy groups are the most common environments for galaxies in the Universe, and they provide a crucial link between cosmology and galaxy evolution. However, their hot gas and baryon content are poorly constrained by current X-ray observations due to their low surface brightness. In this talk, I will demonstrate the efficiency of spectral stacking as a method to overcome these...
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Johan Comparat08/04/2024, 17:05
In this presentation, in a first part, I review the current measurements of the hot CGM carried out on eROSITA using the galaxy samples from SDSS and GAMA. Then I discuss the potential of combining the next-level spectroscopic surveys (4MOST and DESI) with the latest eROSITA observations to measure the properties of hot CGM.
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In a second part, I discuss the challenges encountered in modelling... -
Emmanuel Schaan09/04/2024, 09:00
Many baryon properties such as density, temperature, bulk velocity and more are imprinted on the CMB as secondary anisotropies. I will review these numerous effects, including the thermal and kinematic Sunyaev-Zel'dovich effects, the patchy screening, highlighting their differences and complementarity. Combined with imprints of the gravitational potential on the CMB, such as lensing,...
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Simone Ferraro09/04/2024, 09:25
The CMB provides and clean and direct way to measure the gas distribution in the outskirts of galaxies and clusters, and therefore measure the effect of feedback. Combining pressure (from tSZ), density (from kSZ) and lensing data, we can reconstruct the full thermodynamic properties of the halo and test hydrodynamical simulations. Moreover, direct measurements of gas density are able to...
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Naonori Sugiyama09/04/2024, 09:45
"The measurement of the Kinematic Sunyaev-Zel'dovich (KSZ) effect is increasingly gaining prominence for the exploration of baryons in the universe. The KSZ effect, an result of the motion of free electron gas, is independent of the gas temperature. Therefore, it is sensitive to the Warm-Hot Intergalactic Medium (WHIM) in the temperature range of 10^5 K < T < 10^7 K, which is neither hot...
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Marian Douspis09/04/2024, 10:05
"The Cosmic Microwave data at very small scales are known to probe not only primordial CMB fluctuations but also many extragalactic components such as tSZ, kSZ, CIB, points sources.
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I will show how to use the cosmological dependent SZ signatures (tSZ and kSZ) at small scales coherently in a combined analysis of Planck and SPT experiments to retrieve not only cosmological parameters but... -
Nabila Aghanim09/04/2024, 10:55
The Large scale Structure of the Universe is organised in a cosmic web made of nodes, filaments, walls and voids, and is well traced by the distribution of galaxies. This filamentary structure, detected in galaxy surveys, contains the majority of baryons in the form of hot and warm gas components. The use of the Sunyaev-Zeldovich (SZ) signal measured by the Planck satellite over the whole sky...
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Ken Osato09/04/2024, 11:20
"The inverse Compton scattering of cosmic microwave background (CMB) photons with hot cosmic gas induces spectral distortions of CMB. This effect leads to the secondary anisotropy of CMB temperature and is referred to as the Sunyaev-Zel'dovich (SZ) effect. The SZ effect is a sensitive probe into the cosmic gas distribution and has been employed to constrain cosmological models and address...
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Aleksandra Kusiak09/04/2024, 11:40
"The Cosmic Microwave Background (CMB) data not only provide powerful constraints on the early Universe physics, but also information from the late Universe, as the CMB photons interact with matter while propagating through cosmic time. One of such powerful probes of late-time physics is the Sunyaev-Zel’dovich (SZ) Effect—inverse-Compton scattering of the CMB photons off free electrons in...
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Stefano Ettori09/04/2024, 14:00
I will discuss the role of non-thermal pressure support as a major source of the difference between the hydrostatic and the total ``true'' halo mass in galaxy clusters. I will present new models and methods to constrain the non-thermal pressure, highlighting the role of the next generation of X-ray observatories, like XRISM and Athena, in constructing a consistent picture of the formation and...
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Joe Mohr09/04/2024, 14:25
Cluster mass calibration using the DES weak lensing dataset as well as weak lensing informed cluster abundance analyses of ICM selected cluster samples from SPT, RASS and eROSITA offer new accuracy and precision for cluster mass measurements that can be used to improve studies of cluster baryonic scaling relations. We present new measurements of the ICM mass versus halo mass relation and...
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Norbert Werner09/04/2024, 14:50
Most galaxies comparable to or larger than the mass of the Milky Way host hot, X-ray-emitting atmospheres and central radio sources. Hot atmospheres and radio jets and lobes are the ingredients of radio-mechanical active galactic nucleus (AGN) feedback. Nearby massive elliptical galaxies are excellent laboratories for the study of AGN feedback and its role in the redistribution of baryons in...
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Yu-Ling Chang09/04/2024, 15:40
Radio-mode feedback from supermassive black holes is expected to impact the evolution of massive galaxies, suppressing star formation and maintaining the heat content of their circumgalactic medium (CGM). However, the effects of this feedback on the cool CGM remain poorly understood. In this talk, I will present our recent study of probing the cool CGM traced by MgII absorption lines around...
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Fabrizio Nicastro09/04/2024, 16:00
"Baryons are still missing at all scales in the Universe, from galaxies to the intergalactic medium at large-scale-structure scales.
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While theory unanimously and since two decades strongly suggests that they should be hiding in hot and tenuous material in the diffuse IGM (the so-called WHIM) and galaxy halos (so called CGM), observations have been struggling in confirming it. This is... -
Ang Liu09/04/2024, 16:25
The first eROSITA All-Sky Survey (eRASS1) was completed in June 2020. The eRASS1 data, catalog, and science results in the western Galactic hemisphere will be released in early 2024. In this talk, I will briefly overview the most recent results on galaxy clusters and superclusters from eRASS1.
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Nhut Truong09/04/2024, 16:45
Current and future microcalorimeter-based X-ray missions (e.g., XRISM, LEM, ATHENA) will have transformative impacts on the study of hot gaseous atmospheres across galactic scales: spanning the circumgalactic medium (CGM) to the intra-group/cluster medium (IGrM/ICM). Notably, these missions will offer high-resolution (eV-scale) spectroscopic data, enabling detailed analysis of the gas motions...
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Nagai Daisuke09/04/2024, 17:10
We are entering the golden age of multi-wavelength astronomical surveys. In the 2020s, a plethora of multi-band surveys (such as Rubin-LSST, DESI, Simons Observatory, CMB-S4, and eROSITA, to name a few) are underway or planned to provide unprecedented insights into the cosmic structure formation and the fundamental physics of the cosmos. One of the key challenges of this cosmic frontier lies...
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Eugene Churazov10/04/2024, 09:00
While X-rays from massive virialized halos are routinely observed, the detection of low density warm-hot intergalactic medium is much more difficult. We discuss specific spectral signatures of WHIM and the possible strategies of finding them with perspective X-ray observatories.
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Xiaoyuan Zhang10/04/2024, 09:25
The warm/hot intergalactic medium (WHIM) within cosmic filaments is one of the least well-characterized baryon repositories in the local Universe. The extremely weak signals in either X-rays or the Sunyaev-Zeldovich effect challenge its robust detection. We utilize SRG/eROSITA All-Sky Survey data to examine WHIM emission properties in > 20 Mpc long cosmic filaments. We detect a 9.2σ...
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Lydia Stofanova10/04/2024, 09:45
The physical properties of the faint and extremely tenuous plasma in the far outskirts of galaxy clusters, the circumgalactic media of normal galaxies, and filaments of the cosmic web, remain one of the biggest unknowns in our story of large-scale structure evolution. Modeling the spectral features due to emission and absorption from this very diffuse plasma poses unique challenges, as both...
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Daniela Galárraga-Espinosa10/04/2024, 10:05
I will present a characterisation of gas in and around filaments at different scales of the Universe using several simulations from the TNG suite. I will show that, at Mpc-scales, the cosmic filaments at the basis of the cosmic skeleton are essentially made of gas in the warm-hot intergalactic medium (WHIM), the ‘missing baryon’ gas phase that is still partially elusive in current...
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Gabriele Ponti10/04/2024, 10:55
The growth of galaxies in the local Universe critically depends on the physical conditions of the hot phase of the interstellar and the circumgalactic medium and on its interplay (via outflows and re-condensation) with the other phases.
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I will review the recent progress on our knowledge of the hot phase of the circumgalactic medium of the Milky Way, as well as of Milky Way like galaxies,... -
Irina Zhuravleva10/04/2024, 11:20
Hot, volume-filling gas in the intracluster medium (ICM) is continuously perturbed by matter accretion along cosmic filaments, mergers, and AGN feedback. Measuring velocities of gas motions is important for understanding energy partition during large-scale structure evolution, astrophysical processes that drive the evolution of galaxies within the ICM, and plasma physics. In my talk, I will...
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Nissim Kanekar10/04/2024, 11:40
The weakness of the hyperfine HI 21cm line, the main tracer of the HI content of galaxies, has meant that we know little about the atomic gas content of high-redshift galaxies and its redshift evolution. In this talk, I will describe new HI 21cm studies of star-forming galaxies at z~0.7-1.5 that, via stacking their HI 21cm emission signals, have resulted in the first measurements of the...
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Chenze Dong10/04/2024, 12:00
While dark matter interacts solely through gravity and is responsible for shaping the cosmic web, baryonic matter exhibits more complicated behavior and modify the structure up to megaparsec scale. Among the physics baryon gets involved, the feedback from active galactic nuclei (AGN) is essential as the observation requires its energy input to regulate the star formation, but at the same time...
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Clancy James11/04/2024, 10:00
"Fast radio bursts (FRBs) are extragalactic radio transients of typcially ~ms duration. Their extreme luminosities allow them to be observed at cosmological distances, with optical follow-up observations identifying their host galaxies at redshifts up to 1.01. The key characteristic of FRBs is their dispersion measure - a frequency dependent delay due to propagation through astrophysical...
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Ilya Khrykin11/04/2024, 10:25
Despite the, yet, unconstrained nature, the Fast Radio Bursts (FRB) became unique probes of various astrophysical and cosmological phenomena. For instance, FRBs were paramount in resolving the so-called ‘missing baryons problem’, yet the major questions remained regarding the relative distribution of cosmic baryons in the diffuse IGM vs CGM of the galactic halos. Unraveling the exact partition...
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Sunil Simha11/04/2024, 11:10
Fast Radio Bursts (FRBs) are emerging as promising new probes of ionized matter in the cosmic web. FRB dispersion measures (DMs) inform us of the integrated line of sight electron density. In combination with identifying foreground structures through redshift surveys, FRB DMs can lay novel constraints on baryon distribution in the circumgalactic and intergalactic media (CGM and IGM)....
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Tzu-Yin Hsu11/04/2024, 11:30
"The enigma of the missing baryons poses a prominent and unresolved problem in astronomy. Dispersion measures (DM), serving as a distinctive observable of fast radio bursts (FRBs), quantify the electron column density along each line of sight, revealing the missing baryons described in the Macquart (DM-z) relation. The scatter of this relation is anticipated to be the variation of cosmic...
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Charles Walker11/04/2024, 11:50
"The large-scale cosmic baryon distribution is sensitive to processes from gravitational collapse to AGN feedback. Characterising it may improve our understanding of the baryon cycle, matter in elusive phases, and cosmological parameters. The Cosmic Web is being probed by an increasingly diverse arsenal of tracers, and techniques from simulations to statistics. Isolating its components has...
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Yuxin Huang11/04/2024, 12:10
"Fast radio bursts (FRBs) have recently become a promising and independent new technique to probe the cosmic baryon distribution through their dispersion measures (DM). Despite the wealth of information provided by spectroscopic surveys and constrained simulations of the D<100Mpc Local Volume, a reliable DM model is still lacking for the Local Volume.
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In this presentation, I will introduce an... -
Isabel Medlock11/04/2024, 14:00
Most diffuse baryons, including the circumgalactic medium (CGM) surrounding galaxies and the intergalactic medium (IGM) in the cosmic web, remain unmeasured and unconstrained. Fast Radio Bursts (FRBs) offer an unparalleled method to measure the electron dispersion measures (DMs) of ionized baryons. Their distribution can resolve the "missing" baryon problem and constrain the history of...
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Tilman Troester11/04/2024, 14:20
"Future weak lensing surveys aim to probe the matter distribution far into the non-linear regime. At these non-linear scales, weak lensing is sensitive to the effects of galaxy formation on the matter distribution, such as the redistribution of gas due to feedback from active galactic nuclei. In this talk, I will show how our models can be calibrated by including probes that are sensitive to...
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Raul Angulo11/04/2024, 14:45
Optimal exploitation of future cosmic probes will rely on a detailed understanding of the connection between dark and visible matter in the universe. In this talk I will discuss several physical approaches to model these connections. By combining with suites of gravity-only simulations, this framework delivers predictions for the observed properties of galaxies and gas as a function of...
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Giovanni Aricò11/04/2024, 15:40
I will present the baryonification as a method to accurately model baryonic processes in a cosmological context, and show how we can exploit multi-wavelength observations to constrain both cosmology and astrophysics.
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Tassia Ferreira11/04/2024, 16:05
We report a first detection, at very high significance ($25\sigma$), of the cross-correlation between cosmic shear and the diffuse X-ray background, using data from the Dark Energy Survey and the ROSAT satellite. The X-ray cross-correlation signal is sensitive to the distribution of the surrounding gas in dark matter haloes. This allows us to use our measurements to place constraints on key...
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Angela Chen11/04/2024, 16:25
Baryonification is a strong candidate for modeling the baryonic feedback on matter power spectrum. The gold of this model is that it provides an inclusive picture of both the intra-cluster physics, namely the cluster component profiles, and the inter-cluster physics, namely the 2pt function statistics of cosmic shear. We plan to both test the validity of this picture and constrain the...
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Laura Salvati11/04/2024, 16:45
"Galaxy clusters are the most massive gravitationally bound objects in the Universe. They are powerful cosmological probe, being able to constrain the matter distribution in the recent Universe.
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In the cluster cosmological analysis, the measurement of cluster mass is a key ingredient. Nevertheless, cluster masses cannot be measured directly. We rely therefore on scaling relations, linking... -
Calvin Leung11/04/2024, 17:05
Weak lensing convergence maps offer a line-of-sight probe of the matter power spectrum, but cosmological inference from the total matter auto-power spectrum is contaminated by baryonic effects which limit the use of small scales. Fast radio bursts (FRBs) offer a line-of-sight probe of baryons at z ~ 1 which offer a path towards independently measuring these baryonic effects at the field level....
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Marcel van Daalen12/04/2024, 09:00
Galaxy formation reduces the clustering of matter on scales k >~0.1 h/Mpc, primarily through AGN and supernova feedback. Several sophisticated models exist to model this effect as a function of cosmology, feedback strength and/or a number of free parameters. In this talk, I will demonstrate that we can understand the suppression of matter clustering to a very high degree as simply mass being...
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Kentaro Nagamine12/04/2024, 09:25
We have developed a new physically motivated supervised machine-learning method, HYDRO-BAM, to reproduce the 3-dimensional Lya forest field in real and redshift space, which learns from a reference hydro simulation including the effects of star formation and feedback. Our new method saves about seven orders of magnitude in computing time, and is accurate up to k ~ 1 h/Mpc in the one- to...
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Benjamin Horowitz12/04/2024, 09:45
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Biwei Dai12/04/2024, 10:05
We develop a new and simple method to model baryonic effects at the field level relevant for weak lensing analyses. We analyze thousands of state-of-the-art hydrodynamic simulations from the CAMELS project, each with different cosmology and strength of feedback, and we find that the cross-correlation coefficient between full hydrodynamic and N-body simulations is very close to 1 down to...
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Alexandra Amon12/04/2024, 11:00
"In this talk, I present a weak lensing view of baryonic feedback effects.
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Key to leveraging the power of weak lensing surveys is an accurate modelling of the matter power spectrum, including the baryonic content. I present a rigorous comparison of state-of-the-art modelling approaches to mitigate barons in cosmological analyses. I show new constraints on cosmological and astrophysical... -
Jaime Salcido12/04/2024, 11:20
"Upcoming large-scale structure (LSS) surveys will measure the matter power spectrum to approximately percent level accuracy with the aim of searching for evidence for new physics beyond the standard model of cosmology. In order to avoid biasing our conclusions, the theoretical predictions need to be at least as accurate as the measurements for a given choice of cosmological parameters....
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Selim Hotinli12/04/2024, 11:40
Baryon fluctuations carry valuable cosmological and astrophysical information. On large scales, cross-correlations between matter and baryon (or electron) fluctuations probe initial conditions, interactions and dynamics during early Universe, such as primordial isocurvature, a smoking-gun signature of inflationary models. On scales corresponding to inter- and circum-galactic media, precise...
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Ryo Terasawa12/04/2024, 12:00
"Cosmic shear is a powerful tool for revealing matter distribution in the large-scale structure of the universe. Li et al. (2023) and Dalal et al. (2023) measured the tomographic cosmic shear correlation functions and power spectra, respectively, from the HSC-Y3 data, and then constrained the cosmological parameters from the model fitting. Although the small scale data has a high...
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Joe Burchett12/04/2024, 14:00
The interconnectedness among galaxies, their circumgalactic media (CGM), and the intergalactic medium (IGM) that permeates the cosmic web has come in ever sharper focus, as it is now clear that star formation and the enrichment of heavy elements critically depends on the exchange of matter and energy from one to the other. I will present results from the observational perspective highlighting...
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Zheng Cai12/04/2024, 14:25
I will provide some new results of about the properties of the interstellar and circumgalactic of galaxies using JWST, ALMA, Keck/KCWI and VLT/MUSE at z=2-5. The properties include the metallicity (e.g., mass-metallicity relation, signature of solar-metallicity in very low-mass galaxies, new tracers such as SIII or so), kinematics (e.g., recycled inflow, IGM metal enrichment), and morphology...
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Siwei Zou12/04/2024, 14:45
This talk will focus on the new era of observing the high-redshift universe enabled by ground-based all-sky surveys and the James Webb Space Telescope (JWST). Specifically, the investigation of the intergalactic medium (IGM)/circumgalactic medium (CGM) and its correlation with local environments from cosmic noon and the reionization epoch (EoR) will be presented, highlighting the synergies...
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Guochao Sun12/04/2024, 15:35
Intensity mapping (IM) is a highly promising approach for the census of cosmic baryons out to Cosmic Dawn. Through low-resolution tomography of many unresolved sources, IM can efficiently map large cosmological volumes in aggregate line or continuum emission, thereby probing the physics of cosmic gas in different phases and environments traced by these emission signals. Understanding and...
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Megan Tillman12/04/2024, 15:55
The low redshift Lyman-α (Lyα) forest (z ≲ 2) presents a challenge for both observers and theorists. Observationally, it is difficult to collect data due to the need for high resolution space-based FUV spectrographs. The observational data we do have for the forest (which lies largely below z=0.5) challenges predictions from cosmological hydrodynamic simulations. In order to resolve theory and...
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