2006A&A...450...53P


Query : 2006A&A...450...53P

2006A&A...450...53P - Astronomy and Astrophysics, volume 450, 53-57 (2006/4-4)

The most metal-rich intervening quasar absorber known.

PEROUX C., KULKARNI V.P., MEIRING J., FERLET R., KHARE P., LAUROESCH J.T., VLADILO G. and YORK D.G.

Abstract (from CDS):

The metallicity in portions of high-redshift galaxies has been successfully measured thanks to the gas observed in absorption in the spectra of quasars, in the Damped Lyman-α systems (DLAs). Surprisingly, the global mean metallicity derived from DLAs is about 1/10th solar at 0≲z≲4 leading to the so-called ``missing-metals problem''. In this paper, we present high-resolution observations of a sub-DLA system at zabs=0.716 with super-solar metallicity toward SDSS J1323-0021. This is the highest metallicity intervening high-H i quasar absorber currently known, and is only the second super-solar such absorber known to date. We provide a detailed study of this unique object from VLT/UVES spectroscopy. We derive [Zn/H]=+0.61, [Fe/H]=-0.51, [Cr/H]=←0.53, [Mn/H]=-0.37, and [Ti/H]=-0.61. Observations and photoionisation models using the CLOUDY software confirm that the gas in this sub-DLA is predominantly neutral and that the abundance pattern is probably significantly different from a Solar pattern. Fe/Zn and Ti/Zn vary among the main velocity components by factors of ∼3 and ∼35, respectively, indicating non-uniform dust depletion. Mn/Fe is super-solar in almost all components, and varies by a factor of ∼3 among the dominant components. It would be interesting to observe more sub-DLA systems and determine whether they might contribute significantly toward the cosmic budget of metals.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - intergalactic medium - quasars: absorption lines - quasars: individual: SDSS J1323-0021

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 LBQS 0058+0155 QSO 01 00 54.1201107072 +02 11 36.331220364   17.48 17.16     ~ 161 0
2 LBQS 1320-0006 QSO 13 23 23.7871066608 -00 21 55.244828772   18.70 18.22     ~ 83 0
3 ALMA J132323.81-002154.1 G 13 23 23.81 -00 21 54.1           ~ 9 0

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2023.02.01-20:18:46

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