J/ApJ/679/1144 Galaxy clusters in LOS to background QSOs. I. (Lopez+, 2008)
Galaxy clusters in the line of sight to background quasars.
I. Survey design and incidence of Mg II absorbers at cluster redshifts.
Lopez S., Barrientos L.F., Lira P., Padilla N., Gilbank D.G.,
Gladders M.D., Maza J., Tejos N., Vidal M., Yee H.K.C.
<Astrophys. J., 679, 1144-1161 (2008)>
=2008ApJ...679.1144L 2008ApJ...679.1144L
ADC_Keywords: Clusters, galaxy ; QSOs ; Redshifts ; Equivalent widths
Keywords: galaxies: clusters: general - quasars: absorption lines
Abstract:
We describe the first optical survey of absorption systems associated
with cluster galaxies at z=0.3-0.9. We have cross-correlated quasars
from the third data release of the SDSS (Cat. VII/243) with
high-redshift cluster/group candidates from the Red-Sequence Cluster
Survey (Cat. J/ApJS/157/1). We have found 442 quasar-cluster pairs for
which the MgIIλ2796, 2803 doublet might be detected at a
transverse (physical) distance d<2h-171Mpc from the cluster
centers. To investigate the incidence dN/dz and equivalent width
distribution n(W) of MgII systems at cluster redshifts, two
statistical samples were drawn out of these pairs: one made of
high-resolution spectroscopic quasar observations (46 pairs), and one
made of quasars used in MgII searches found in the literature (375
pairs).
Description:
Low-resolution optical spectroscopic follow-up observations of the
quasar candidates from the X-ray sample were carried out with the Wide
Field Reimaging CCD Camera in long-slit grism mode on the du Pont
telescope at Las Campanas Observatory on 2006 March 30 and September
15-16. High-resolution spectroscopy was obtained using the MIKE
spectrograph on the Las Campanas Clay 6.5m telescope. We obtained 18
quasar spectra in three runs on 2006 March 18-19 and September 23-24
and 29-30 (see table 1).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 19 High-resolution spectroscopic quasar observations
table2.dat 51 65 MgII absorber systems
table3.dat 51 97 *Galaxy clusters
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Note on table3.dat: This table displays only LOSs with detected absorption.
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/ApJ/679/239 : Associated MgII absorbers (Vanden+, 2008)
J/MNRAS/371/495 : Catalogue of 1806 MgII absorbers from SDSS DR3 (Bouche+,
2007)
J/ApJ/639/766 : SDSS-DR3 strong MgII absorbers (Prochter+, 2006)
J/ApJS/157/1 : Red-Sequence Cluster Survey (Gladders+, 2005)
J/ApJS/158/161 : Photometric redshift catalog from the RCS (Hsieh+, 2005)
J/MNRAS/354/L25 : MgII absorbers in SDSS QSOs (Bouche+, 2004)
http://www.rcs2.org/ : RCS2 home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Quasar identification
20 A1 --- f_Name [b] Flag for newly discovered quasar;
named after Chandra fields, no position given
22- 25 F4.1 mag gmag Magnitude in g-band
27- 31 I5 s ExpT Exposure time
33- 35 I3 --- S/N Median signal-to-noise ratio per pixel
37- 46 A10 "YYYY/MM/DD" Obs.Date Date of observation
47 A1 --- --- [-]
48- 49 I2 --- Date2 ? 2nd day of observation
51- 62 A12 --- Remark Data from archive
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- LOS Line of sight number (G1)
4- 21 A18 --- Name Quasar identification
23- 26 F4.2 --- zem ? Emission redshift
28- 32 F5.3 --- zEW ? Minimum redshift (1)
34- 39 F6.4 --- zabs MgII absorption redshift
41- 45 F5.3 0.1nm W2796 Rest-frame equivalent width of MgII2796
47- 51 F5.3 0.1nm e_W2796 1σ error on W2796
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Note (1): Minimum redshift for a 3σ detection of the MgII2796 line
with W>Wmin0.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- LOS Line of sight number (G1)
4- 20 A17 --- Name Cluster name (1)
22- 26 F5.3 --- z Cluster redshift from RCS (Cat. J/ApJS/157/1)
unless flag in r_z col
27 A1 --- r_z [a-f] Reference for z if not RCS (2)
29- 33 F5.3 --- zmin Minimum redshift surveyed
35- 39 F5.3 --- zmax Maximum redshift surveyed
41- 44 F4.2 arcmin dist Projected distance from quasar LOS to cluster
coordinates
46- 51 F6.1 kpc dist2 Physical distance at zcluster from quasar LOS
to cluster coordinates (in h71-1kpc unit)
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Note (1): Names are mostly RCS HHMMSS+DDMM.m ( in Simbad).
Note (2): References as follows:
a = Faure et al. (2004A&A...428..741F 2004A&A...428..741F).
b = Barkhouse et al. (2006, Cat. J/ApJ/645/955).
c = Kneib et al. (2000ApJ...544L..35K 2000ApJ...544L..35K).
d = Green et al. (2005ApJ...630..142G 2005ApJ...630..142G).
e = Stocke et al. (1991, Cat. IX/15).
f = Perlman et al. (2002, Cat. J/ApJS/140/265).
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Global notes:
Note (G1): LOSs 1-19: absorbers found in sample S1 (see table 1);
LOSs 20-31: absorbers found in sample S2 (MgII in low-resolution
spectra).
History:
From electronic version of the journal
References:
Padilla et al. Paper II. 2009MNRAS.395.1135P 2009MNRAS.395.1135P
(End) Emmanuelle Perret [CDS] 15-Oct-2010