J/ApJ/774/40 Galaxy clusters aligned with quasars. III. (Andrews+, 2013)
Galaxy clusters in the line of sight to background quasars.
III. Multi-object spectroscopy.
Andrews H., Barrientos L.F., Lopez S., Lira P., Padilla N., Gilbank D.G.,
Lacerna I., Maureira M.J., Ellingson E., Gladders M.D., Yee H.K.C.
<Astrophys. J., 774, 40 (2013)>
=2013ApJ...774...40A 2013ApJ...774...40A
ADC_Keywords: Clusters, galaxy ; QSOs ; Redshifts ; Galaxies, spectra
Keywords: cosmology: observations; intergalactic medium;
quasars: absorption lines
Abstract:
We present Gemini/GMOS-S multi-object spectroscopy of 31 galaxy
cluster candidates at redshifts between 0.2 and 1.0 and centered on
QSO sight lines taken from Lopez et al. (Paper I, J/ApJ/679/1144). The
targets were selected based on the presence of an intervening MgII
absorption system at a similar redshift to that of a galaxy cluster
candidate lying at a projected distance <2h71-1Mpc from the QSO
sight line (a "photometric hit"). The absorption systems span
rest-frame equivalent widths between 0.015 and 2.028Å. The general
population of our confirmed absorbing galaxies have luminosities
LB∼LB* and mean rest-frame colors (Rc-z') typical of Scd
galaxies.
Description:
Our spectroscopic data were obtained with the Gemini Multi-Object
Spectrograph (GMOS) at the Gemini South Telescope in Cerro Pachon,
Chile, between 2008 July and 2008 December (program ID: GS-2008A-Q-10;
PI: S. Lopez). In the odd-numbered figures from 1-17, we show a
snapshot of each 5.5'x5.5' pre-image field observed with GMOS.
Based on the Rc and z' color-magnitude diagram for galaxy-type objects
around the cluster/group candidate coordinates (Gladders & Yee 2005,
J/ApJS/157/1), in addition to already known color-magnitude relations
derived from composite clusters of galaxies (Gilbank et al.
2008ApJ...673..742G 2008ApJ...673..742G), we selected objects of second priority in order
to detect potential brightest cluster members.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 24 The 9 QSO fields studied in this work
table3.dat 139 43 Spectroscopic targets of field 022300.41+005250.0
table4.dat 136 51 Spectroscopic targets of field 022441.09+001547.9
table5.dat 153 48 Spectroscopic targets of field 022553.59+005130.9
table6.dat 144 50 Spectroscopic targets of field 022839.32+004623.0
table7.dat 114 49 Spectroscopic targets of field HE2149-2745A
table8.dat 123 55 Spectroscopic targets of field 231500.81-001831.2
table9.dat 123 49 Spectroscopic targets of field 231509.34+001026.2
table10.dat 153 49 Spectroscopic targets of field 231759.63-000733.2
table11.dat 136 46 Spectroscopic targets of field 231958.70-002449.3
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See also:
VII/174 : Morphological type catalog in rich galaxy clusters (Dressler, 1980)
J/ApJ/761/112 : High-redshift MgII absorption QSOs with FIRE (Matejek+, 2012)
J/ApJ/754/38 : MgII absorption systems for FSRQs (Chand+, 2012)
J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010)
J/ApJ/679/1144 : Galaxy clusters in LOS to background QSOs. I. (Lopez+, 2008)
J/MNRAS/371/495 : Catalogue of MgII absorbers from SDSS DR3 (Bouche+, 2006)
J/ApJ/641/169 : Spectroscopy in lens fields (Momcheva+, 2006)
J/ApJ/625/6 : Galaxy groups in the DEEP2 GRS (Gerke+, 2005)
J/ApJS/157/1 : Red-Sequence Cluster Survey (Gladders+, 2005)
J/AJ/123/1807 : SDSS galaxy clusters redshifts (Goto+, 2002)
J/A+A/316/123 : QSO absorber and galaxy evolution (Lindner+ 1996)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- Field Line of sight identifier
20- 24 F5.3 --- zem [0.8/2.1] Redshift of the QSO
26 I1 --- Nc [1/6] Number of RCS1 cluster/group candidates
lying at d<2h-171Mpc from the LOS
28- 33 F6.4 --- zabs [0.2/1.3] Absorption redshift with
δzabs∼10-4
35- 39 F5.3 0.1nm W2796 [0.01/2.1] Rest-frame equivalent width of
MgII determined in Paper I
41- 45 F5.3 0.1nm e_W2796 [0.003/0.07] W2796 uncertainty
47- 49 A3 --- Hit Photometric hit? (1)
50 A1 --- f_Hit [*] *: new photo-hit
52- 54 A3 --- Hit1 Photometric hit used in Paper I? (2)
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Note (1): Absorption system that is considered as a photometric hit or not
according to Tables 2 and 3 from Paper I (Lopez et al. 2008,
J/ApJ/679/1144), except for * which corresponds to a new photo-hit.
These are used in the analysis of the present work.
Note (2): Absorption system that is considered as a photometric hit used
in the analysis of Paper I, that is, those having z<0.9 and
W02796>0.05Å.
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Byte-by-byte Description of file:table[3-9].dat table1[01].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/55] Running sequence number
4- 5 I2 h RAh Hour of right ascension (J2000)
7- 8 I2 min RAm Minute of right ascension (J2000)
10- 14 F5.2 s RAs Second of right ascension (J2000)
16 A1 --- DE- Sign of declination (J2000)
17- 18 I2 deg DEd Degree of declination (J2000)
20- 21 I2 arcmin DEm Arcminute of declination (J2000)
23- 27 F5.2 arcsec DEs Arcsecond of declination (J2000)
29- 35 F7.5 --- zgal [0/2.6]? Redshift of the MgII absorbing galaxy
(zgal=0 for stars)
37- 43 F7.5 --- e_zgal [0/0.008]? zgal uncertainty (0 for stars)
45 I1 --- q_zgal [0/3]?=0 Redshift reliability flag
(1=the most reliable)
47- 51 F5.2 mag z'mag [16.4/25.9]? z' (9100Å) band corrected AB
magnitude (1)
53- 57 F5.2 mag Rc-z' [-1.1/3.3]? (Rc-z') color index (1)
59-153 A95 --- Comm Comments
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Note (1): All apparent magnitudes are given in the AB system and are corrected
for galactic extinction according to the dust maps of
Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S).
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History:
From electronic version of the journal
References:
Lopez et al. Paper I. 2008ApJ...679.1144L 2008ApJ...679.1144L Cat. J/ApJ/679/1144
Padilla et al. Paper II. 2009MNRAS.395.1135P 2009MNRAS.395.1135P
(End) Emmanuelle Perret [CDS] 27-Feb-2015