J/A+A/606/A13 QSO eHAQ0111+0641 spectra (Fynbo+, 2017)
The High AV Quasar Survey: A z = 2.027 metal-rich damped Lyman-α absorber
towards a red quasar at z = 3.21.
Fynbo J.P.U., Krogager J.-K., Heintz K.E., Geier S., Moller P.,
Noterdaeme P., Christensen L., Ledoux C., Jakobsson P.
<Astron. Astrophys. 606, A13 (2017)>
=2017A&A...606A..13F 2017A&A...606A..13F (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Spectra, infrared
Keywords: quasars: general - quasars: absorption lines -
quasars: individual: eHAQ0111+0641
Abstract:
It is important to understand the selection effects behind the quasar
samples to fully exploit the potential of quasars as probes of cosmic
chemical evolution and the internal gas dynamics of galaxies; in
particular, it is vital to understand whether the selection criteria
exclude foreground galaxies with certain properties, most importantly
a high dust content. Here we present spectroscopic follow-up from the
10.4m GTC telescope of a dust-reddened quasar, eHAQ0111+0641, from
the extended High AV Quasar (HAQ) survey. We find that the z=3.21
quasar has a foreground damped Lyman-α absorber (DLA) at z=2.027
along the line of sight. The DLA has very strong metal lines due to a
moderately high metallicity with an inferred lower limit of 25% of the
solar metallicity, but a very large gas column density along the line
of sight in its host galaxy. This discovery is further evidence that
there is a dust bias affecting the census of metals, caused by the
combined effect of dust obscuration and reddening, in existing samples
of z>2 DLAs. The case of eHAQ0111+0641 illustrates that dust bias is
not only caused by dust obscuration, but also dust reddening.
Description:
eHAQ0111+0641 was observed with the OSIRIS instrument at the Gran
Telescopio Canarias (GTC) as part of a larger sample of candidate red
quasars. We secured spectroscopy with OSIRIS and a range of grisms to
better constrain the spectral energy distribution, metal lines, and
hydrogen Lyα line.
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
01 11 34.71 +06 41 19.22 eHAQ0111+0641
-----------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 139 4 List of spectra
sp/* . 4 Individual fits spectra
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Nx Number of pixels along X-axis
6 I1 --- Ny Number of spectra
8- 30 A23 --- Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.sss)
32- 38 F7.2 0.1nm blambda Lower valuer of spectral interval
40- 47 F8.2 0.1nm Blambda Upper valuer of spectral interval
49- 56 F8.6 0.1nm dlambda Spectral resolution
58- 59 I2 Kibyte size Size of FITS file
61- 88 A28 --- FileName Name of FITS file, in subdirectory sp
90-139 A50 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Johan Peter Uldall Fynbo, jfynbo(at)nbi.ku.dk
(End) Patricia Vannier [CDS] 27-Sep-2017