The gas and stellar mass of low-redshift damped Lyman-$\alpha$ absorbers

Abstract

We report Hubble Space Telescope Cosmic Origins Spectrograph far-ultraviolet and Arecibo Telescope H{\sc i} 21cm spectroscopic studies of six damped and sub-damped Lyman-$\alpha$ absorbers (DLAs and sub-DLAs, respectively) at $z\lesssim 0.1$, that have yielded estimates of their H{\sc i} column density, metallicity and atomic gas mass. This significantly increases the number of DLAs with gas mass estimates, allowing the first comparison between the gas masses of DLAs and local galaxies. Including three absorbers from the literature, we obtain H{\sc i} masses $\approx (0.24-5.2)\times 10^9{\mathrm{M}}_{\odot }$, lower than the knee of the local H{\sc i} mass function. This implies that massive galaxies do not dominate the absorption cross-section for low-$z$ DLAs. We use Sloan Digital Sky Survey photometry and spectroscopy to identify the likely hosts of four absorbers, obtaining low stellar masses, $\approx 10^7-10^{8.7}{M}_{\odot }$, in all cases, consistent with the hosts being dwarf galaxies. We obtain high H{\sc i} 21\,cm or CO emission line widths, $\Delta V_{20}\approx 100-290$~km~s${}^{-1}$, and high gas fractions, $f_{\mathrm{HI}}\approx 5-100$, suggesting that the absorber hosts are gas-rich galaxies with low star formation efficiencies. However, the H{\sc i} 21\,cm velocity spreads ($\gtrsim 100$~km~s${}^{-1}$) appear systematically larger than the velocity spreads in typical dwarf galaxies.

arXiv comment6 pages, 2 figures. Accepted for publication in MNRAS Letters

References in corpus (40)

• Planck 2015 results. XIII. Cosmological parameters
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Damped Lyman alpha Systems
• The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
• The SDSS Damped Lya Survey: Data Release 3
• Metallicity Evolution of Damped Lyman-alpha Systems out to z~5
• The Arecibo Legacy Fast ALFA Survey: X. The HI Mass Function and Omega_HI From the 40% ALFALFA Survey
• The Age-Metallicity Relation of the Universe in Neutral Gas: The First 100 Damped Lya Systems
• The Arecibo Legacy Fast ALFA Survey: The Galaxy Population Detected by ALFALFA
• The VLT-UVES survey for molecular hydrogen in high-redshift damped Lyman-alpha systems
• Stellar Masses and SFRs for 1M Galaxies from SDSS and WISE
• FIGGS: Faint Irregular Galaxies GMRT Survey - Overview, observations and first results
• Molecular hydrogen in high-redshift Damped Lyman-alpha systems: The VLT/UVES database
• Reconciling the local galaxy population with damped Ly-alpha cross sections and metal abundances
• The Northern HIPASS catalogue - Data presentation, completeness and reliability measures
• A deep search for 21cm absorption in high redshift damped Lyman-$\alpha$ systems
• Connection Between the Circumgalactic Medium and the Interstellar Medium of Galaxies: Results from the COS-GASS Survey
• Verifying the mass-metallicity relation in damped Lyman-alpha selected galaxies at 0.1<z<3.2
• The spin temperature of high-redshift damped Lyman-$\alpha$ systems
• Galaxy counterparts of metal-rich damped Lyman-alpha absorbers - II. A solar-metallicity and dusty DLA at z_abs=2.58
• A SINFONI Integral Field Spectroscopy Survey for Galaxy Counterparts to Damped Lyman-alpha Systems - III. Three Additional Detections
• The HI Content of the Universe over the Past 10 Gyrs
• The Galaxy Counterparts of the two high-metallicity DLAs at z=2.412 and z=2.583 towards Q0918+1636
• Discovery of a Primitive Damped Lyman alpha Absorber Near an X-ray Bright Galaxy Group in the Virgo Cluster
• The First Observations of Low Redshift Damped Lyman-alpha Systems with the Cosmic Origins Spectrograph
• Catalog of Visually Classified Galaxies in the Local ($z\sim 0.01$) Universe
• [CII] 158 micron Emission from the Host Galaxies of Damped Lyman Alpha Systems
• A catalogue of photometric redshifts for the SDSS-DR9 galaxies
• The First Observations of Low-Redshift Damped Lyman-α Systems with the Cosmic Origins Spectrograph: Chemical Abundances and Affiliated Galaxies
• A Comparison of Absorption and Emission Line Abundances in the Nearby Damped Lyman-alpha Galaxy SBS 1543+593
• Directly imaging damped Ly-alpha galaxies at z>2. II: Imaging and spectroscopic observations of 32 quasar fields
• First Connection between Cold Gas in Emission and Absorption: CO Emission from a Galaxy-Quasar Pair
• ATCA search for 21 cm emission from a candidate damped Ly-$\alpha$ absorber at z = 0.101
• HI 21cm imaging of a nearby Damped Lyman-alpha system
• 21-cm H I emission from the Damped Lyman-alpha absorber SBS 1543+593
• Cold parsec-scale gas in a zabs~0.1 sub-DLA with disparate H2 and 21-cm absorption
• The Nearby Damped Lyman-alpha Absorber SBS 1543+593: A Large HI Envelope in a Gas-Rich Galaxy Group
• HI 21cm observations of the PG1216+069 sub-DLy-alpha absorber field at z=0.00632
• HI 21cm emission from the sub-damped Lyman-alpha absorber at z=0.0063 towards PG1216+069
• Constraints on the gas masses of low-z damped Lyman-$\alpha$ systems

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