J/ApJ/727/47 The MgII cross-section of red galaxies (Bowen+, 2011)
The Mg II cross-section of luminous red galaxies.
Bowen D.V., Chelouche D.
<Astrophys. J., 727, 47 (2011)>
=2011ApJ...727...47B 2011ApJ...727...47B
ADC_Keywords: Galaxies, spectra ; Redshifts ; QSOs ; Equivalent widths
Keywords: galaxies: clusters: general -
galaxies: elliptical and lenticular, cD - galaxies: groups: general -
galaxies: halos - quasars: absorption lines
Abstract:
We describe a search for MgII(2796, 2803) absorption lines in Sloan
Digital Sky Survey (SDSS) spectra of QSOs whose lines of sight pass
within impact parameters ρ∼200kpc of galaxies with photometric
redshifts of z=0.46-0.6 and errors Δz∼0.05. The galaxies
selected have the same colors and luminosities as the Luminous Red
Galaxy (LRG) population previously selected from the SDSS. A search
for MgII lines within a redshift interval of ±0.1 of a galaxy's
photometric redshift shows that absorption by these galaxies is rare:
the covering fraction is f(ρ)∼10%-15% between ρ=20kpc and
ρ=100kpc, for MgII lines with rest equivalent widths of
Wr≥0.6Å, falling to zero at larger ρ. There is no evidence
that Wr correlates with impact parameter or galaxy luminosity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 131 593 Mg II absorption in QSO-galaxy pairs
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/ApJS/194/42 : SDSS-DR3 MgII-based black hole masses (Rafiee+, 2011)
J/ApJ/724/L176 : MgII absorbing gas around galaxies (Chen+, 2010)
J/ApJ/698/819 : MgII and LRGs cross-correlation analysis (Lundgren+, 2009)
J/ApJ/679/239 : Associated MgII absorbers (Vanden+, 2008)
J/ApJ/660/1093 : Weak MgII absorbers at 0.4<z<2.4 (Narayanan+, 2007)
J/ApJ/639/766 : SDSS-DR3 strong MgII absorbers (Prochter+, 2006)
J/MNRAS/371/495 : Catalogue of MgII absorbers from SDSS DR3 (Bouche+, 2006)
J/MNRAS/354/L25 : MgII absorbers in SDSS QSOs (Bouche+, 2004)
J/A+A/410/33 : MgII/FeII absorbers in 2dF-quasar survey (Menard+, 2003)
J/AJ/106/848 : QSO MgII absorption line systems (Drinkwater+, 1993)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- QSO Background SDSS QSO name
(JHHMMSS.ss+DDMMSS.s) (1)
21- 24 I4 --- Plate ? SDSS-DR6 Plate
25 A1 --- --- [-]
26- 30 I5 --- MJD ? SDSS-DR6 Modified Julian Date
31 A1 --- --- [-]
32- 34 I3 --- Fib ? SDSS-DR6 Fiber
36- 40 F5.3 --- zQSO [0.766/2.095]? QSO emission redshift
42- 60 A19 --- Gal Galaxy SDSS name (JHHMMSS.ss+DDMMSS.s)
62- 66 F5.3 --- zCC2 [0.459/0.6] Galaxy photometry redshift
68- 72 F5.3 --- e_zCC2 Uncertainty in zCC2
74- 77 F4.1 mag rmag Galaxy r band model magnitude de-reddened for
Milky Way dust absorption
79- 83 F5.1 mag rMag SDSS absolute r band magnitude (2)
85- 88 F4.1 arcsec ASep [3.4/30] QSO-galaxy angular separation
90- 94 F5.1 kpc rho [20/197.1] QSO-galaxy impact parameter
96-101 F6.4 --- zabs [0.3779/0.6509]? Mg II absorption redshift (if
doublet detected within ±0.1 of zCC2)
103-109 F7.4 --- Dz ? Difference Δz between zabs and zCC2
111 A1 --- l_W2796 The 2σ upper limit flag on W2796
112-115 F4.2 0.1nm W2796 Rest MgII (2796) equivalent width
117-120 F4.2 0.1nm e_W2796 ? Uncertainty in W2796
122 A1 --- l_W2803 The 2σ upper limit flag on W2803
123-126 F4.2 0.1nm W2803 Rest MgII (2803) equivalent width
128-131 F4.2 0.1nm e_W2803 ? Uncertainty in W2803
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Note (1): Entries are listed in order of increasing QSO-galaxy impact
parameter. In some cases, multiple galaxies satisfying our selection
criteria were found around a single sightline. These are also listed,
but are kept together with a single QSO entry, even though they may
have much larger impact parameters.
Note (2): Based on zCC2, after applying a K-correction to measure the
r-band luminosity at a redshift z=0.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 23-Aug-2012