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Detailed Description of J/ApJ/660/239 :
MaxBCG catalog of 13823 galaxy clusters from SDSS (Koester+, 2007)

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Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.
J/ApJ/660/239 MaxBCG catalog of 13823 galaxy clusters from SDSS (Koester+, 2007)
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A MaxBCG catalog of 13,823 galaxy clusters from the Sloan Digital Sky Survey.
    Koester B.P., McKay T.A., Annis J., Wechsler R.H., Evrard A., Bleem L.,
    Becker M., Johnston D., Sheldon E., Nichol R., Miller C., Scranton R.,
    Bahcall N., Barentine J., Brewington H., Brinkmann J., Harvanek M.,
    Kleinman S., Krzesinski J., Long D., Nitta A., Schneider D.P., Sneddin S.,
    Voges W., York D.
   <Astrophys. J., 660, 239-255 (2007)>
   =2007ApJ...660..239K
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ADC_Keywords: Clusters, galaxy ; Redshifts ; Photometry, SDSS

Keywords: galaxies: clusters: general


Abstract:
    We present a catalog of galaxy clusters selected using the maxBCG
    red-sequence method from Sloan Digital Sky Survey photometric data.
    This catalog includes 13823 clusters with velocity dispersions
    greater than ~400km/s and is the largest galaxy cluster catalog
    assembled to date. They are selected in an approximately
    volume-limited way from a 0.5Gpc3 region covering 7500deg2 of sky
    between redshifts 0.1 and 0.3. Each cluster contains between 10 and
    190 E/S0 ridgeline galaxies brighter than 0.4L* within a scaled radius
    R200.

Description:
    Data for this study are drawn from the Sloan Digital Sky Survey a
    combined imaging and spectroscopic survey of 104deg2 in the north
    Galactic cap and a smaller region in the south. The imaging survey was
    carried out using a specially designed 2.5m telescope in drift-scan
    mode in five SDSS filters (u, g, r, i, and z) to a limiting magnitude
    of r<22.5.

    The maxBCG galaxy cluster selection algorithm applied to the input
    galaxy catalog is described in more detail in a companion paper
    (Koester et al., 2007ApJ...660..221K).

File Summary:

FileName Lrecl Records Explanations
× 80 . This file × ReadMe 80 . This file × table1.dat 97 13823 Cluster catalog
See also: II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007) http://www.sdss.org : SDSS Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 14 F14.10 deg RAdeg BCG Right Ascension in decimal degrees (J2000) 16- 29 F14.10 deg DEdeg BCG Declination in decimal degrees (J2000) 31- 38 F8.6 --- zph Photometric redshift 40- 49 F10.7 --- zsp ?=-1.00000 Spectroscopic BCG redshift 51- 59 F9.6 10+10solLum LBr BCG r-band luminosity 61- 69 F9.6 10+10solLum LBi BCG i-band luminosity 71- 79 F9.5 10+10solLum LTr Total r-band luminosity 81- 89 F9.5 10+10solLum LTi Total i-band luminosity 91- 93 I3 --- Ngal Detection richness 95- 97 I3 --- NR200 Scaled richness (1)
Note (1): the scaled richness is the number of E/S0 member galaxies brighter than 0.4L* and within R200 of the cluster center, R200 being the radius within which the density of galaxies with -24mag<=Mr<=-16mag is 200 times the mean density of such galaxies.
Nomenclature note: Clusters identified as [KMA2007] DDD.ddddd+DD.ddddd in Simbad History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Patricia Vannier [CDS] 05-Mar-2009