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J/ApJ/692/511        Mergers of luminous early-type galaxies        (Wen+, 2009)

Mergers of luminous early-type galaxies in the local universe and gravitational wave background. Wen Z.L., Liu F.S., Han J.L. <Astrophys. J., 692, 511-521 (2009)> =2009ApJ...692..511W
ADC_Keywords: Photometry, SDSS ; Galaxies, optical ; Redshifts Keywords: black hole physics - galaxies: general - galaxies: interactions - gravitational waves Abstract: Supermassive black hole (SMBH) coalescence in galaxy mergers is believed to be one of the primary sources of very low frequency gravitational waves (GWs). Significant contribution of the GWs comes from mergers of massive galaxies with redshifts z<2. Very few previous studies gave the merger rate of massive galaxies. We selected a large sample (1209) of close pairs of galaxies with projected separations 7<rp<50kpc from 87889 luminous early-type galaxies (Mr←21.5) from the Sloan Digital Sky Survey Data Release 6. These pairs constitute a complete volume-limited sample in the local universe (z<0.12). Using our newly developed technique, 249 mergers have been identified by searching for interaction features. From them, we found that the merger fraction of luminous early-type galaxies is 0.8%, and the merger rate in the local universe is Rg~(1.0±0.4)x10-5Mpc-3/Gyr with an uncertainty mainly depending on the merging timescale. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 110 1209 A list of luminous early-type galaxy pairs from SDSS DR6
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/ApJ/685/235 : Host and companion galaxies in the SDSS (Patton+, 2008) J/AJ/132/2596 : Spectroscopy of Ultraluminous IR galaxies (Darling+, 2006) J/AJ/126/1183 : Major galaxy mergers at z≲3 (Conselice+, 2003) J/ApJ/565/208 : Galaxy pairs in the CNOC2 Redshift Survey (Patton+, 2002) http://www.sdss.org/ : SDSS home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq [1/1209] Pair identification number <[WLH2009] NNNN> in Simbad 6- 14 F9.5 deg RA1deg First galaxy Right Ascension (J2000) 16- 24 F9.5 deg DE1deg First galaxy Declination (J2000) 26- 34 F9.5 deg RA2deg Second galaxy Right Ascension (J2000) 36- 44 F9.5 deg DE2deg Second galaxy Declination (J2000) 46- 50 F5.2 mag r1mag First galaxy SDSS r-band magnitude 52- 56 F5.2 mag r2mag Second galaxy SDSS r-band magnitude 58- 63 F6.2 mag r1MAG Frist galaxy fitted absolute r-band magnitude 65- 70 F6.2 mag r2MAG Second galaxy fitted absolute r-band magnitude 72- 76 F5.2 kpc Sep Pair separation 78- 82 F5.2 --- a Pair asymmetry factor 84- 88 F5.2 mag rres Pair residual r-band magnitude 90- 95 F6.4 --- z Pair redshift 97- 98 A2 --- f_z sp for spectroscopic or ph for photometric redshift 100-110 A11 --- Class Merging/non-merging system classification
Nomenclature notes: Galaxies are <[WLH2009] JDDD.ddddd+DD.ddddd> in Simbad. History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 03-Mar-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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