2004A&A...416...79D


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET03:15:36

2004A&A...416...79D - Astronomy and Astrophysics, volume 416, 79-110 (2004/3-2)

A comprehensive set of elemental abundances in damped Lyα systems: Revealing the nature of these high-redshift galaxies.

DESSAUGES-ZAVADSKY M., CALURA F., PROCHASKA J.X., D'ODORICO S. and MATTEUCCI F.

Abstract (from CDS):

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 total optical spectral range from 3150 to 10000Å for the four quasars. This large wavelength coverage and the high quality of the spectra allowed us to measure the column densities of up to 21 ions, namely of 15 elements - N, O, Mg, Al, Si, P, S, Cl, Ar, Ti, Cr, Mn, Fe, Ni, Zn. This comprehensive set of ionic column densities and elemental abundances severely contrasts with the majority of DLAs for which only a handful of ions and elements is typically observed. Such a large amount of information is necessary to constrain the photoionization and dust depletion effects, two important steps in order to derive the intrinsic chemical abundance patterns of DLAs. We evaluated the photoionization effects with the help of the Al+/Al++, Fe+/Fe++, N0/N+ and Ar/Si, S ratios, and computed dust corrections. Our analysis revealed that the DLA toward Q2343+12 requires important ionization corrections. This makes the abundance determinations in this object uncertain. The access to the complete series of relatively robust intrinsic elemental abundances in the other three DLAs allowed us to constrain their star formation history, their age and their star formation rate by a detailed comparison with a grid of chemical evolution models for spiral and dwarf irregular galaxies. Our results show that the galaxies associated with these three DLAs in the redshift interval zabs=1.7-2.5 are either outer regions of spiral disks (radius ≥8kpc) or dwarf irregular galaxies (showing a bursting or continuous star formation history) with ages varying from some 50Myr only to >3.5Gyr and with moderate star formation rates per unit area of -2.1<logψ←1.5M/yr/kpc2.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: abundances - galaxies: evolution - galaxies: quasars: absorption lines

Nomenclature: Table 3: [DCP2004] QSO J0103+1316 abs N.NNNNNN N=7. Table 4: [DCP2004] QSO J1333+1649 abs N.NNNNNN N=17. Table 5: [DCP2004] QSO J2234+0000 abs N.NNNNNN N=30. Tables6, 7: [DCP2004] QSO J2346+1248 abs N.NNNNNN N=23+15.

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

CDS comments: QSO 2343+12 = QSO J2346+1248 = QSO J2346+1241. Table 1: The DLAs in the line of sight of the 4 QSOs are [PGW2001] QSO JHHMM+DDMM abs N.NNN in SIMBAD.

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PHL 957 QSO 01 03 11.2740814277 +13 16 17.810502093   16.97 16.57     ~ 330 0
2 QSO B0551-36 QSO 05 52 46.1825351739 -36 37 27.606597529   17.72 17.57     ~ 89 0
3 QSO J0812+32 QSO 08 12 40.6859427300 +32 08 08.578960457   18.16 17.75     ~ 92 0
4 QSO B1331+170 QSO 13 33 35.7828550018 +16 49 04.012528106   16.84 16.71 16.41   ~ 419 0
5 QSO B1759+7539 BLL 17 57 46.3591958319 +75 39 16.182864362     16.50     ~ 82 0
6 LBQS 2231-0048 QSO 22 33 59.9313869539 -00 33 15.797603856   18.19 17.76     ~ 37 0
7 LBQS 2230-0015 QSO 22 34 08.9971883754 +00 00 01.695912538   18.09 17.39 17.3   ~ 119 0
8 QSO B2343+125 QSO 23 46 28.200 +12 49 00.00     17.5     ~ 130 2

    Equat.    Gal    SGal    Ecl

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2021.03.02-03:15:36

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