An Introduction to Gas Accretion onto Galaxies

Abstract

Evidence for gas accretion onto galaxies can be found throughout the universe. In this chapter, I summarize the direct and indirect signatures of this process and discuss the primary sources. The evidence for gas accretion includes the star formation rates and metallicities of galaxies, the evolution of the cold gas content of the universe with time, numerous indirect indicators for individual galaxies, and a few direct detections of inflow. The primary sources of gas accretion are the intergalactic medium, satellite gas and feedback material. There is support for each of these sources from observations and simulations, but the methods with which the fuel ultimately settles in to form stars remain murky.

14 pages, 5 figures, Invited review to appear in Gas Accretion onto Galaxies, Astrophysics and Space Science Library, eds. A. J. Fox & R. Davé, to be published by Springer

References in corpus (23)

• Cosmic Star Formation History
• Ubiquitous outflows in DEEP2 spectra of star-forming galaxies at z=1.4
• Cold gas accretion in galaxies
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• The Geneva-Copenhagen Survey of the Solar neighbourhood II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk
• The Search for the Missing Baryons at Low Redshift
• The cold gaseous halo of NGC 891
• On the (Non)Evolution of HI Disks over Cosmic Time
• Accretion of gas onto nearby spiral galaxies
• The HI content of star-forming galaxies at z = 0.24
• The COS/UVES Absorption Survey of the Magellanic Stream. III: Ionization, Total Mass, and Inflow Rate onto the Milky Way
• The Dearth of Neutral Hydrogen in Galactic Dwarf Spheroidal Galaxies
• The Source of Ionization along the Magellanic Stream
• Highest Redshift Image of Neutral Hydrogen in Emission: A CHILES Detection of a Starbursting Galaxy at z=0.376
• The environmental dependence of HI in galaxies in the EAGLE simulations
• A relationship between specific star formation rate and metallicity gradient within z=1 galaxies from KMOS-HiZELS
• Local Volume TiNy Titans: Gaseous Dwarf-Dwarf Interactions in the Local Universe
• MUSE searches for galaxies near very metal-poor gas clouds at z~3: new constraints for cold accretion models
• Gas Loss by Ram Pressure Stripping and Internal Feedback From Low Mass Milky Way Satellites
• The building up of the disk galaxy M33 and the evolution of the metallicity gradient
• Linked evolution of gas and star formation in galaxies over cosmic history
• The Structure of the Circumgalactic Medium of Galaxies: Cool Accretion Inflow Around NGC 1097
• HST/COS Observations of Ionized Gas Accretion at the Disk-halo Interface of M33

Cited by in corpus (17)

• The Extended Distribution of Baryons Around Galaxies
• xGASS: HI fueling of star formation in disk-dominated galaxies
• ALMACAL VI: Molecular gas mass density across cosmic time via a blind search for intervening molecular absorbers
• The effect of gas accretion on the radial gas metallicity profile of simulated galaxies
• Exploring Chemical Homogeneity in Dwarf Galaxies: A VLT-MUSE study of JKB 18
• GASP. VII. Gas accretion onto an isolated galaxy
• Evidence for the Accretion of Gas in Star-Forming Galaxies: High N/O Abundances in Regions of Anomalously-Low Metallicity
• Directly tracing cool filamentary accretion over >100 kpc into the interstellar medium of a quasar host at z=1
• HALOGAS: Strong Constraints on the Neutral Gas Reservoir and Accretion Rate in Nearby Spiral Galaxies
• Metal content of the circumgalactic medium around star-forming galaxies at z $\sim$ 2.6 as revealed by the VIMOS Ultra-Deep Survey
• Probing galaxy evolution through HI 21-cm emission and absorption: current status and prospects with the Square Kilometre Array
• Bidimensional Exploration of the warm-Temperature Ionised gaS (BETIS) II. Revisiting the ionisation mechanism of the extraplanar diffuse ionised gas
• Decoding NGC 628 with radiative transfer methods
• Feeding the Dead: Neutral Gas Inflow in a Long-Quenched Ancient Massive Galaxy at $z\sim 2.7$ Observed with JWST/NIRSpec
• Extraplanar emission in isolated edge-on late-type galaxies. I. The H$\alpha$ distribution versus to the old and young stellar discs
• Stellar CoRGI in MaNGA: Stellar Counterrotating Galaxies Identified in the MaNGA Survey
• Spatially Resolved Properties of Extraplanar Diffuse Ionized Gas in NGC3511 and NGC3513