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J/ApJ/698/819     MgII and LRGs cross-correlation analysis     (Lundgren+, 2009)

A cross-correlation analysis of Mg II absorption line systems and luminous red galaxies from the SDSS DR5. Lundgren B.F., Brunner R.J., York D.G., Ross A.J., Quashnock J.M., Myers A.D., Schneider D.P., Alsayyad Y., Bahcall N. <Astrophys. J., 698, 819-839 (2009)> =2009ApJ...698..819L
ADC_Keywords: Galaxies, spectra ; QSOs ; Redshifts ; Equivalent widths ; Surveys Keywords: quasars: general Abstract: We analyze the cross-correlation of MgII(λ2796, 2803) quasar absorption systems with luminous red galaxies (LRGs) from the Fifth Data Release (DR5) of the Sloan Digital Sky Survey. The absorption line sample consists of 2705 unambiguously intervening MgII absorption systems, detected at a 4σ level, covering a redshift range (0.36≤zabs≤0.8) and a rest equivalent-width range of 0.8Å≤Wλ2796r≤5.0Å. We cross-correlate these absorbers with 1495604 LRGs with accurate photometric redshifts in the same redshift range and examine the relationship of MgII equivalent width and clustering amplitude. Description: The data for this paper have been drawn from the Fifth Data Release (DR5) of the SDSS (Adelman-McCarthy et al. 2007, Cat. II/276; superseded by II/294). Through 2005 June, the SDSS had imaged ≳8000deg2 and obtained follow-up spectra for nearly 7x105 galaxies and 8x104 quasars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 87 3469 Catalog of selected SDSS DR5 MgII systems
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 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/MNRAS/380/1608 : LRG catalog (Lopes+, 2007) J/MNRAS/375/68 : MegaZ-LRG catalogue (Collister+, 2007) J/ApJ/639/766 : SDSS-DR3 strong MgII absorbers (Prochter+, 2006) J/MNRAS/371/495 : Catalogue of 1806 MgII absorbers from SDSS DR3 (Bouche+, 2006) J/MNRAS/372/425 : 2dF-SDSS Luminous Red Galaxy Survey, 2SLAQ (Cannon+, 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) : Sloan Digital Sky Survey (SDSS) home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) 11- 22 F12.8 deg DEdeg Declination in decimal degrees (J2000) 24- 29 F6.4 --- zMgII Redshift from MgIIλ2796 line 31- 35 F5.3 --- zQSO SDSS QSO redshift 37- 41 F5.2 0.1nm W2796 MgII2796 rest equivalent width in Angstroms 43- 47 F5.2 --- S/N(W) Ratio of W2796 to its error 49- 52 F4.2 --- DR MgII doublet ratio (1) 54- 57 F4.2 --- e_DR Error in DR 59- 64 F6.3 --- beta The beta absorber velocity parameter (2) 66- 70 F5.2 mag imag SDSS i'-band AB magnitude 72- 75 I4 --- Plate SDSS plate number (3) 77- 79 I3 --- Fiber SDSS fiber number 81- 85 I5 d MJD Modified Julian Date 87 A1 --- Q [ABC] Absorption system grade (4)
Note (1): Represents the measured ratio of line strengths for each observed MgII doublet, Wrλ2796/Wrλ2803. Note (2): Measurements of absorber velocities in the quasar rest frame are commonly described using the dimensionless quantity, β, where β=ν/c=([(1+zqso)/(1+zabs)]2-1)/([(1+zqso)/(1+zabs)]2+1) See sections 2.3 and 5.1 for further details. Note (3): Table sorted by SDSS plate number. Included absorbers have Wrλ2796≥0.8 Angstroms, imag≤19.5, zMgII≤0.8, seeing <1.5" and reddening <0.2. Note (4): Grade as follows: A = Systems with at least four lines with confident detections; B = Systems with three confident line identifications. C = Systems with two lines, which are generally MgII doublets or CIV doublets. The automated process used to identify and grade absorption systems is detailed extensively in D. G. York et al. (2009, in preparation). See section 2.2 for further details.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Jun-2011
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