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

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References

SHOWING 1-10 OF 64 REFERENCES
The sub-damped Ly α system toward HE 0001−2340: galaxy formation at z ≈ 2
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
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
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
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
...
1
2
3
4
5
...