# Ionization corrections in a multiphase interstellar medium: lessons from a zabs∼ 2 sub‐DLA

@article{Milutinovic2010IonizationCI,
title={Ionization corrections in a multiphase interstellar medium: lessons from a zabs∼ 2 sub‐DLA},
author={N. Milutinovic and Sara L Ellison and J. Xavier Prochaska and Jason Tumlinson},
journal={Monthly Notices of the Royal Astronomical Society},
year={2010},
volume={408},
pages={2071-2082}
}
We present a high resolution (FWHM= 2.7 km s −1 ), high S/N echelle spectrum for the zem = 2.26 QSO J2123−0050 and determine elemental abundances for the zabs = 2.06 subDLA in its line of sight. This high redshift sub-DLA has a complex kinematic structure and harbours detections of neutral (Si, Ci), singly (e.g. Cii, Sii) and multiply ionized (e.g. Civ, Siiv) species as well as molecular H2 and HD. The plethora of detected transitions in various ionization stages is indicative of a complex… Expand
20 Citations

#### Figures and Tables from this paper

VLT/UVES observations of peculiar alpha abundances in a sub-DLA at z ~ 1.8 towards the quasar B1101-26
We present a detailed analysis of chemical abundances in a sub-damped Lyman alpha absorber at z=1.839 towards the quasar B1101-26, based on a very-high-resolution (R ~ 75,000) andExpand
Discovery of a Perseus-like cloud in the early Universe - H I-to-H2 transition, carbon monoxide and small dust grains at zabs≈ 2.53 towards the quasar J0000+0048
We present the discovery of a molecular cloud at z_abs sim 2.5255 along the line of sight to the quasar SDSS J000015.17+004833.3. We use a high-resolution spectrum obtained with the Ultraviolet andExpand
A high molecular fraction in a subdamped absorber at z = 0.56
Measuring rest-frame ultraviolet rotational transitions from the Lyman and Werner bands in absorption against a bright background continuum is one of the few ways to directly measure molecularExpand
A cold component and the complex velocity structure of DLA1331 + 170
• Physics
• 2010
We examine the velocity structure in the gas associated with H I in the damped Lyα absorption system at redshift z = 1.7764 towards the QSO 1331 + 170 using Arecibo H i 21-cm data, optical spectraExpand
Metallicities and dust content of proximate damped Lyman α systems in the Sloan Digital Sky Survey
• Physics
• 2010
Composite spectra of 85 proximate absorbers [log N(H I) > 20 cm -2 and velocity difference between the absorption and emission redshifts, ΔV 6000 km s -1 , with further sub-samples to investigate theExpand
The spin temperature of high-redshift damped Lyman α systems
• Physics
• 2014
We report results from a programme aimed at investigating the temperature of neutral gas in high-redshift damped Lyman α absorbers (DLAs). This involved (1) H I 21 cm absorption studies of a largeExpand
The ESO UVES advanced data products quasar sample – VI. Sub-damped Lyman α metallicity measurements and the circumgalactic medium
The circumgalactic medium (CGM) can be probed through the analysis of absorbing systems in the line of sight to bright background quasars. We present measurements of the metallicity of a new sampleExpand
HI content, metallicities and spin temperatures of damped and sub-damped Lyman alpha systems in the redshift desert (0.6 < z < 1.7)
• Physics
• 2012
The HI 21cm absorption optical depth and the N(HI) derived from Lya absorption can be combined to yield the spin temperature (Ts) of DLAs. Although Ts measurements exist for samples of DLAs with zExpand
Sub-damped Lyman α systems in the XQ-100 survey – II. Chemical evolution at 2.4 ≤ z ≤ 4.3
We present the measured gas-phase metal column densities in 155 sub-damped Ly α systems (subDLAs) with the aim to investigate the contribution of subDLAs to the chemical evolution of the Universe.Expand
The First Observations of Low-redshift Damped Lyα Systems with the Cosmic Origins Spectrograph: Chemical Abundances and Affiliated Galaxies
We present Cosmic Origins Spectrograph (COS) measurements of metal abundances in eight 0.083 < zabs < 0.321 damped Lyman-α (DLA) and sub-damped Lyα absorption systems serendipitously discovered inExpand

#### References

SHOWING 1-10 OF 64 REFERENCES
The sub-damped Ly α system toward HE 0001−2340: galaxy formation at z ≈ 2
• Physics
• 2005
We present a detailed analysis of chemical abundances in a sub-damped Ly α absorber (sub-DLA) at z = 2.187 towards the quasar HE 0001−2340 (zem = 2.28). Our study is based on high-resolution (R ≈ 45Expand
Multiphase Plasma in Sub-Damped Lyα Systems: A Hidden Metal Reservoir*
We present a VLT UVES spectrum of a proximate sub-damped Lyα (sub-DLA) system at zabs = 2.65618 toward the quasar Q0331-4505 (zqso = 2.6785 ± 0.0030). Absorption lines of O I, Si II, Si III, Si IV, CExpand
Molecular hydrogen in high-redshift Damped Lyman-alpha systems: The VLT/UVES database
• Physics
• 2008
Aims. We present the current status of ongoing searches for molecular hydrogen in high-redshift (1.8 z abs ≤ 4.2) Damped Lyman- α systems (DLAs) capitalising on observations performed with the ESOExpand
New abundance determinations in z < 1.5 QSO absorbers: seven sub-DLAs and one DLA
We present chemical abundance measurements from high resolution observations of 7 subdamped Lyman-� absorbers and 1 damped Lyman-� system at z < 1.5. Three of these objects have high metallicity,Expand
A homogeneous sample of sub-damped Lyman systems – IV. Global metallicity evolution
An accurate method to measure the abundance of high-redshift galaxies involves the observation of absorbers along the line of sight towards a background quasar. Here, we present abundanceExpand
A comprehensive set of elemental abundances in damped Lyα systems: Revealing the nature of these high-redshift galaxies
By combining our UVES-VLT spectra of a sample of four damped Lyα systems (DLAs) toward the quasars Q0100+13, Q1331+17, Q2231−00 and Q2343+12 with the existing HIRES-Keck spectra, we covered the totalExpand
The chemical compositions of 10 new sub-DLAs and strong Lyman-limit systems at z≲ 1.5
We present chemical abundance measurements from medium-resolution observations of eight subdamped Lya (sub-DLA) absorber and two strong Lyman-limit systems at z ≤ 1.5 observed with the MagellanExpand
Metal abundances at z < 1.5: new measurements in sub-damped Lyman α absorbers★
Damped Lyman a systems (DLAs) andsub-DLAs seen towards background quasars provide the most detailed probes of elemental abundances. Somewhat paradoxically these measurements are more difficult atExpand
HE 0515–4414: an unusual sub-damped Ly $\alpha$ system revisited
• Physics
• 2008
Aims. We examine the ionization, abundances, and differential dust depletion of metals, the kinematic structure, and the physical conditions in the molecular hydrogen-bearing sub-damped Ly α systemExpand
H i 21 cm absorption at z ∼ 2.347 towards PKS B0438-436
• Physics
• 2006
We report the detection of redshifted H i 21-cm absorption in the z ~ 2.347 damped Lyman absorber (DLA) towards PKS B0438-436 with the Green Bank Telescope. This is the second-highest redshift atExpand