2018A&A...615A..43H


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET03:42:12

2018A&A...615A..43H - Astronomy and Astrophysics, volume 615A, 43-43 (2018/7-1)

A quasar hiding behind two dusty absorbers. Quantifying the selection bias of metal-rich, damped Lyα absorption systems.

HEINTZ K.E., FYNBO J.P.U., LEDOUX C., JAKOBSSON P., MOLLER P., CHRISTENSEN L., GEIER S., KROGAGER J.-K. and NOTERDAEME P.

Abstract (from CDS):

The cosmic chemical enrichment as measured from damped Lyα absorbers (DLAs) will be underestimated if dusty and metal-rich absorbers have evaded identification. Here we report the discovery and present the spectroscopic observations of a quasar, KV-RQ 1500-0031, at z=2.520 reddened by a likely dusty DLA at z=2.428 and a strong MgII absorber at z=1.603. This quasar was identified as part of the KiDS-VIKING Red Quasar (KV-RQ) survey, specifically aimed at targeting dusty absorbers which may cause the background quasars to escape the optical selection of e.g. the Sloan Digital Sky Survey (SDSS) quasar sample. For the DLA we find an HI column density of logN(HI)=21.2±0.1 and a metallicity of [X/H]=-0.90±0.20 derived from an empirical relation based on the equivalent width of SiIIλ 1526. We observe a total visual extinction of AV=0.16mag induced by both absorbers. To put this case into context we compile a sample of 17 additional dusty (AV>0.1mag) DLAs toward quasars (QSO-DLAs) from the literature for which we characterize the overall properties, specifically in terms of HI column density, metallicity and dust properties. From this sample we also estimate a correction factor to the overall DLA metallicity budget as a function of the fractional contribution of dusty QSO-DLAs to the bulk of the known QSO-DLA population. We demonstrate that the dusty QSO-DLAs have high metal column densities (logN(HI)+[X/H]) and are more similar to gamma-ray burst (GRB)-selected DLAs (GRB-DLAs) than regular QSO-DLAs. We evaluate the effect of dust reddening in DLAs as well as illustrate how the induced color excess of the underlying quasars can be significant (up to ∼1mag in various optical bands), even for low to moderate extinction values (AV≤0.6mag). Finally we discuss the direct and indirect implications of a significant dust bias in both QSO- and GRB-DLA samples.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: general - galaxies: ISM - galaxies: abundances - quasars: absorption lines - gamma-ray burst: general - dust, extinction

Simbad objects: 20

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Number of rows : 20

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 SDSS J000015.17+004833.2 QSO 00 00 15.1754935052 +00 48 33.305853119           ~ 18 0
2 LBQS 0013-0029 QSO 00 16 02.4050445836 -00 12 25.076529860   18.67 18.36     ~ 181 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9698 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5857 1
5 QSO J0316+0040 QSO 03 16 09.8391866494 +00 40 43.086118331   19.41 19.02     ~ 30 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15197 1
7 QSO J0812+32 QSO 08 12 40.6859427300 +32 08 08.578960457   18.16 17.75     ~ 92 0
8 SDSS J081634.38+144612.4 QSO 08 16 34.3910998279 +14 46 12.475883677   21.91 20.39     ~ 36 0
9 QSO J0840+4942 QSO 08 40 32.9604553179 +49 42 52.885920172   19.61 19.28     ~ 20 0
10 QSO J0918+1636 QSO 09 18 26.1649965997 +16 36 09.020318645   21.19 20.58     ~ 38 0
11 QSO J0927+5823 QSO 09 27 08.8804735012 +58 23 19.384629051   19.13 18.68     ~ 32 0
12 MGC 22531 QSO 11 35 20.3948170427 -00 10 53.578794908   19.36       ~ 42 0
13 [VV2006] J115705.6+615521 QSO 11 57 05.5205467480 +61 55 21.769163048   21.26 20.40     ~ 23 0
14 SDSS J121143.42+083349.7 QSO 12 11 43.4238496452 +08 33 49.681491390           ~ 15 0
15 QSO J1310+5424 QSO 13 10 40.2429956830 +54 24 49.489932580   19.16 18.79     ~ 32 0
16 GRB 130606A gB 16 37 35.12 +29 47 46.4           ~ 117 0
17 QSO J1709+3258 QSO 17 09 09.2836905613 +32 58 03.405538488   19.68 19.40     ~ 30 0
18 QSO J2222-0946 QSO 22 22 56.1132208000 -09 46 36.290535978   18.71 18.34     ~ 69 0
19 QSO J2340-0053 QSO 23 40 23.6702895509 -00 53 26.997605159   18.26 17.93     ~ 85 0
20 NAME Local Group GrG ~ ~           ~ 7181 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-03:42:12

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