CGM${}^2$ $+$ CASBaH: The Mass Dependence of H~I Ly$\alpha$-Galaxy Clustering and the Extent of the CGM

Abstract

We combine datasets from the CGM${}^2$ and CASBaH surveys to model a transition point, $R_{\mathrm{cross}}$, between circumgalactic and intergalactic media (CGM and IGM, respectively). In total, our data consist of 7244 galaxies at z < 0.5 with precisely measured spectroscopic redshifts, all having impact parameters of 0.01 - 20 comoving Mpc from 28 QSO sightlines with high-resolution UV spectra that cover H I Ly$\alpha$. Our best-fitting model is an exclusionary two-component model that combines a 3D absorber-galaxy cross correlation function with a simple Gaussian profile at inner radii to represent the CGM. By design, this model gives rise to a determination of $R_{\mathrm{cross}}$ as a function of galaxy stellar mass, which can be interpreted as the boundary between the CGM and IGM. For galaxies with $10^8\le M_{\star }/M_{\odot }\le 10^{10.5}$, we find that $R_{\mathrm{cross}}(M_{\star })\approx 2\pm 0.6R_{\mathrm{vir}}$. Additionally, we find excellent agreement between $R_{\mathrm{cross}}(M_{\star })$ and the theoretically-determined splashback radius for galaxies in this mass range. Overall, our results favor models of galaxy evolution at z < 0.5 that distribute $T\approx 10^4$K gas to distances beyond the virial radius.

arXiv commentSubmitted to ApJ, 17 pages, 8 figures

References in corpus (81)

• emcee: The MCMC Hammer
• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Simulating Galaxy Formation with the IllustrisTNG Model
• Overview of the DESI Legacy Imaging Surveys
• Galactic star formation and accretion histories from matching galaxies to dark matter haloes
• CIGALE: a python Code Investigating GALaxy Emission
• Simba: Cosmological Simulations with Black Hole Growth and Feedback
• The Circumgalactic Medium
• The Large Scale Bias of Dark Matter Halos: Numerical Calibration and Model Tests
• Analysis of galaxy SEDs from far-UV to far-IR with CIGALE: Studying a SINGS test sample
• Equation of State of the Photoionized Intergalactic Medium
• The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the extended Baryon Oscillation Spectroscopic Survey and from the second phase of the Apache Point Observatory Galactic Evolution Experiment
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• COLOSSUS: A python toolkit for cosmology, large-scale structure, and dark matter halos
• The Cosmic Origins Spectrograph
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Dependence of the outer density profiles of halos on their mass accretion rate
• A Two-Parameter Model for the Infrared/Submillimeter/Radio Spectral Energy Distributions of Galaxies and AGN
• The COS-Halos Survey: Rationale, Design, and A Census of Circumgalactic Neutral Hydrogen
• The COS-Halos Survey: An Empirical Description of the Metal-Line Absorption in the Low-Redshift Circumgalactic Medium
• A Budget and Accounting of Metals at z~0: Results from the COS-Halos Survey
• Model-independent insights into the nature of the Lyman-alpha forest and the distribution of matter in the universe
• The splashback radius as a physical halo boundary and the growth of halo mass
• Probing the IGM/Galaxy Connection V: On the Origin of Lya and OVI Absorption at z<0.2
• Absorption line systems in simulated galaxies fed by cold streams
• The COS-Halos Survey: Metallicities in the Low-Redshift Circumgalactic Medium
• A High-Resolution Survey of Low-Redshift QSO Absorption Lines: Statistics and Physical Conditions of O VI Absorbers
• The COS-Dwarfs Survey: The Carbon Reservoir Around sub-L* Galaxies
• Figuring Out Gas & Galaxies in Enzo (FOGGIE). I. Resolving Simulated Circumgalactic Absorption at 2 < z < 2.5
• Splashback in accreting dark matter halos
• The Impact of Enhanced Halo Resolution on the Simulated Circumgalactic Medium
• The pseudo-evolution of halo mass
• An HST/COS Survey of the Low-Redshift IGM. I. Survey, Methodology, & Overall Results
• The Impact of Star Formation Feedback on the Circumgalactic Medium
• The Hidden Mass and Large Spatial Extent of a Poststarburst Galaxy Outflow
• Not Dead Yet: Cool Circumgalactic Gas in the Halos of Early Type Galaxies
• Mining Circumgalactic Baryons in the Low-Redshift Universe
• MAGICC haloes: confronting simulations with observations of the circumgalactic medium at z=0
• Quasars Probing Quasars II: The Anisotropic Clustering of Optically Thick Absorbers around Quasars
• Constraints on Hydrodynamical Subgrid Models from Quasar Absorption Line Studies of the Simulated Circumgalactic Medium
• The intergalactic medium over the last 10 billion years I: Lyman alpha absorption and physical conditions
• The Environment of Lyman a Absorbers in the Sightline toward 3C273
• Mergers and Mass Accretion for Infalling Halos Both End Well Outside Cluster Virial Radii
• The intergalactic medium over the last 10 billion years II: Metal-line absorption and physical conditions
• The Relationship Between Intergalactic HI/OVI and Nearby (z<0.017) Galaxies
• Hydrogen and Metal Line Absorption Around Low-Redshift Galaxies in Cosmological Hydrodynamic Simulations
• Galactic and Circumgalactic OVI and its Impact on the Cosmological Metal and Baryon Budgets at 2<z<3.5
• Connection Between the Circumgalactic Medium and the Interstellar Medium of Galaxies: Results from the COS-GASS Survey
• Characterizing the UV-to-NIR shape of the dust attenuation curve of IR luminous galaxies up to z$\sim$2
• O VI and Multicomponent H I Absorption Associated with a Galaxy Group in the Direction of PG0953+415: Physical Conditions and Baryonic Content
• The Column Density, Kinematics, and Thermal State of Metal-Bearing Gas within the Virial Radius of z~2 Star-Forming Galaxies in the Keck Baryonic Structure Survey
• A Deep Search For Faint Galaxies Associated With Very Low-redshift C IV Absorbers: III. The Mass- and Environment-dependent Circumgalactic Medium
• Detection of Ne VIII in the Low-Redshift Warm-Hot IGM
• The Temperature-Density Relation in the Intergalactic Medium at Redshift <z>=2.4
• The Impact of Cosmic Rays on Thermal Instability in the Circumgalactic Medium
• The Large-scale Distribution of Cool Gas around Luminous Red Galaxies
• Multiphase Gas In Galaxy Halos: The OVI Lyman-limit System toward J1009+0713
• The COS Absorption Survey of Baryon Harbors (CASBaH): Warm-hot Circumgalactic Gas Reservoirs Traced by Ne VIII Absorption
• The First Observations of Low Redshift Damped Lyman-alpha Systems with the Cosmic Origins Spectrograph
• The CAMELS Multifield Dataset: Learning the Universe's Fundamental Parameters with Artificial Intelligence
• CGM${}^2$ I: The Extent of the Circumgalactic Medium Traced by Neutral Hydrogen
• On the connection between the intergalactic medium and galaxies: The HI-galaxy cross-correlation at z < 1
• The splashback boundary of haloes in hydrodynamic simulations
• The Co-Evolution of Galaxies and the Cool Circumgalactic Medium Probed with the SDSS and DESI Legacy Imaging Surveys
• Probing the IGM-Galaxy Connection Toward PKS0405-123 II : A Cross-Correlation Study of Lya Absorbers and Galaxies at z<0.5
• Fast Winds Drive Slow Shells: A Model for the Circumgalactic Medium as Galactic Wind-Driven Bubbles
• The COS Absorption Survey of Baryon Harbors: Unveiling the Physical Conditions of Circumgalactic Gas through Multiphase Bayesian Ionization Modeling
• Revealing the Dark Threads of the Cosmic Web
• Cross correlation of Lyman-alpha absorbers with gas-rich galaxies
• A Deep Search For Faint Galaxies Associated With Very Low-redshift C IV Absorbers: II. Program Design, Absorption-line Measurements, and Absorber Statistics
• Environmental Dependence of Galactic Properties Traced by Ly$\alpha$ Forest Absorption: Diversity among Galaxy Populations
• Large Scale Structure in Absorption: Gas within and around Galaxy Voids
• The COS Absorption Survey of Baryon Harbors: The Galaxy Database and Cross-Correlation Analysis of OVI Systems
• On the connection between the metal-enriched intergalactic medium and galaxies: an OVI-galaxy cross-correlation study at $z<1$
• The Bimodal Absorption System Imaging Campaign (BASIC) I. A Dual Population of Low-metallicity Absorbers at z $<1$
• The evolution of the low-density HI intergalactic medium from z=3.6 to 0: Data, transmitted flux and HI column density
• On the relation between Lya absorbers and local galaxy filaments
• Constraints on precipitation-limited hot halos from massive galaxies to galaxy clusters
• How are Lyman $\alpha$ absorbers in the cosmic web related to gas-rich galaxies?

Cited by in corpus (3)

• A positive correlation between broad HI Ly$\alpha$ absorptions and local overdensities of galaxies
• Mainly on the Plane: Observing the Extended, Ionized Disks of Milky Way Analogs in IllustrisTNG
• The GLEAM 4-Jy (G4Jy) Sample: IV. Multiwavelength data and analysis