Damped Lyman alpha Systems

  title={Damped Lyman alpha Systems},
  author={Arthur M. Wolfe and Eric Gawiser and Jason Xavier Prochaska},
  journal={arXiv: Astrophysics},
Observations of damped Lyman alpha systems offer a unique window on the neutral-gas reservoirs that gave rise to galaxies at high redshifts. This review focuses on critical properties such as the H I and metal content of the gas and on independent evidence for star formation. Together, these provide an emerging picture of gravitationally bound objects in which accretion of gas from the IGM replenishes gas consumed by star formation. Other properties such as dust content, molecular content… 
Dust-depletion sequences in damped Lyman-α absorbers
Metals in the interstellar medium (ISM) of essentially all types of galaxies are observed to be depleted compared to the expected values. The depletion is most likely due to dust condensation in, for
Reproducing the kinematics of damped Lyman α systems
We examine the kinematic structure of Damped Lyman- Systems (DLAs) in a series of cosmological hydrodynamic simulations using the AREPO code. We are able to match the distribution of velocity widths
Evidence for diffuse molecular gas and dust in the hearts of gamma-ray burst host galaxies
Context. Damped Lyman-α (DLA) absorption-line systems at the redshifts of gamma-ray burst (GRB) afterglows offer a unique way to probe the physical conditions within star-forming galaxies in the
Testing galaxy formation simulations with damped Lyman-α abundance and metallicity evolution
We examine the properties of damped Lyman-α absorbers (DLAs) emerging from a single set of cosmological initial conditions in two state-of-the-art cosmological hydrodynamic simulations: simba and
Extremely strong damped Lyα systems at high redshifts
We present a spectroscopic analysis of seven Extremely Strong Damped Lyα systems at redshifts z = 2–3, obtained with the intermediate-resolution spectrograph X-shooter on the Very Large Telescope.
Evolution of the Dust Composition in Damped Lyα Systems
We present a method for estimating the relative abundances of refractory elements in the interstellar dust of galaxies hosting damped Lyα (DLA) systems. The method requires gas-phase column densities
The chemical connection between damped Lyman-α systems and Local Group dwarf galaxies
Abundances of the volatile elements S and Zn have now been measured in around 80 individual stars in the Sculptor dwarf spheroidal galaxy, covering the metallicity range − 2.4 ≤ [Fe/H] ≤−0.9. These
Discovery of a Damped Lyα System in a Low-z Galaxy Group: Possible Evidence for Gas Inflow and Nuclear Star Formation
We present a low-redshift (z = 0.029) damped Lyα (DLA) system in the spectrum of a background quasi-stellar object (QSO). The DLA is associated with an interacting galaxy pair within a galaxy group.
Probing the Assembly of Dwarf Galaxies through Cosmic Time with Damped Lyα Absorption Spectroscopy
We investigate the absorption features associated with a gas-rich dwarf galaxy, using cosmological hydrodynamics simulations. Our goal is to explore whether the progenitors of the lowest-mass dwarf
Cold neutral hydrogen gas in galaxies
  • R. Dutta
  • Physics
    Journal of Astrophysics and Astronomy
  • 2019
This review summarizes recent studies of the cold neutral hydrogen gas associated with galaxies probed via the HI 21-cm absorption line. HI 21-cm absorption against background radio-loud quasars is a


Origin and evolution of the elements
This work on the origin and evolution of cosmic elements draws upon the work of experts at an international conference held in Paris in 1992. It deals with stellar and primordial nuceosynthesis,