SIMBAD references

2006PASP..118.1077H - Publ. Astron. Soc. Pac., 118, 1077-1097 (2006/August-0)

The metal-strong damped Lyα systems.


Abstract (from CDS):

We have identified a metal-strong [logN(Zn+)≥13.15 or logN(Si+)≥15.95] damped Lyα (MSDLA) population from an automated quasar (QSO) absorber search in the Sloan Digital Sky Survey (SDSS) Data Release 3 quasar sample and find that MSDLAs comprise ~5% of the entire DLA population with zabs≥2.2 found in QSO sight lines with r<19.5. We have also acquired 27 Keck ESI (Echellete Spectrograph and Imager) follow-up spectra of metal-strong candidates in order to evaluate our automated technique and examine the MSDLA candidates at higher resolution. We demonstrate that the rest equivalent widths of strong Zn II λ2026 and Si II λ1808 lines in low-resolution SDSS spectra are accurate indicators of metal-strong systems in higher resolution spectra, and predict the observed equivalent widths Wobsand signal-to-noise ratios needed to detect certain extremely weak lines with high-resolution instruments. We investigate how the MSDLAs may affect previous studies concerning a dust obscuration bias and the N(H I)-weighted cosmic mean metallicity <Z(z)>. Finally, we include a brief discussion of abundance ratios in our ESI sample and find that underlying mostly Type II supernova enrichment are differential depletion effects due to dust (and in a few cases, these are quite strong); we present here a handful of new Ti and Mn measurements, both of which are useful probes of depletion in DLAs. Future papers will present detailed examinations of particularly metal-strong DLAs from high-resolution Keck I HIRES and VLT UVES spectra.

Abstract Copyright:

Journal keyword(s): Galaxies: Quasars: Absorption Lines - Galaxies: Abundances - Galaxies: Evolution

VizieR on-line data: <Available at CDS (J/PASP/118/1077): table3.dat tables.dat>

Nomenclature: Table 3: [HPD2006] SDSS abs N.NNN N=435.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: Paragr.1: FJ 0812+32 = QSO J0812+3208 in SIMBAD (confusion between 1950 and 2000 coordinates), and the DLA with z=2.626 is [PHW2003] Galaxy in SIMBAD.

Simbad objects: 417

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