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J/ApJ/528/123   KRI photometry of galaxies near B2 1335+28   (Tanaka+, 2000)
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A rich cluster of galaxies near the quasar B2 1335+28 at z=1.1:
color distribution and star formation properties.
     Tanaka I., Yamada T., Aragon-Salamanca A., Kodama T., Miyaji T., Ohta K.,
     Arimoto N.
    <Astrophys. J. 528, 123 (2000)>
    =2000ApJ...528..123T
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ADC_Keywords: Clusters, galaxy ; QSOs ; Photometry, RI ; Photometry, infrared
Keywords: galaxies: clusters: individual (B2 1335+28 Cluster) -
          galaxies: elliptical and lenticular, cD - galaxies: evolution -
          galaxies: formation - quasars: individual (B2 1335+28) -
          X-rays: galaxies

Abstract:
    We previously reported a significant clustering of red galaxies
    (R-K=3.56) around the radio-loud quasar B2 1335+28 at z=1.086. In this
    paper, we establish the existence of a rich cluster at the quasar
    redshift and study the properties of the cluster galaxies through
    further detailed analysis of the photometric data. We also list the
    positions, K-band magnitudes, and colors of all K<19 objects. The
    near-infrared (NIR) K-band imaging data presented in earlier paper,
    together with some additional K-band data, is newly analyzed to study
    the extent of the clustering of the red galaxies. We also constrain
    the cluster redshift by applying a robust photometric redshift
    estimator and find a strong peak around z=1.1. The color distribution
    of the galaxies in the cluster is quite broad, and the fraction of
    blue galaxies (70%) is much larger than in intermediate-redshift
    clusters.

Objects:
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       RA   (2000)   DE      Designation(s)
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    13 38 07.5   +28 05 11   B2 1335+28
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File Summary:
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 FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe            80        .   This file
table1.dat        54      103   K-selected object catalog
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1-  4  I4    ---     [TYA2000] Sequential number (1)
   6- 11  F6.1  pix     Xpos      Offset in right ascension from the quasar (2)
  13- 18  F6.1  pix     Ypos      Offset in declination from the quasar (2)
  20- 24  F5.2  mag     Kmag      K_MB_ magnitude (3)
  26- 29  F4.2  mag     R-I       R-I colour index (4)
  31- 34  F4.2  mag   e_R-I       rms uncertainty on R-I
  36- 39  F4.2  mag     R-K       R-K colour index (4)
  41- 44  F4.2  mag   e_R-K       rms uncertainty on R-K
  46- 49  F4.2  mag     I-K       I-K colour index (4)
  51- 54  F4.2  mag   e_I-K       rms uncertainty on I-K
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Note (1): Identification numbers in the 1000s, the 2000s, and the 3000s
    represent galaxies in the cluster region, the western region, and the
    eastern region, respectively.
Note (2): Quasar position: RA=13h 38min 07.45s, DE=28{deg} 05' 10.7" (J2000)
    The scale is 0.1886arcsec/pix, and not arcsec as stated in the note b
    (see the "History" section below)
Note (3): the value is the MAG_BEST output for the K-band data produced
    by SExtractor (Bertin & Arnouts, 1996A&AS..117..393B). These values
    are used as total magnitudes for the galaxies.
Note (4): Colors are measured in 3.5" diameter apertures for the
    seeing-matched frames. The tabulated errors are empirical values based
    on repeated photometry for each object (see Sect. 2 of the paper)
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History: From ApJ electronic version
  * 11-Jul-2000: following a mail exchange between Ichi Tanaka
    (itanaka@optik.mtk.nao.ac.jp) and Marion Schmitz
    (zb4ms@ipac.caltech.edu), it appeared that the (x,y) values are
    not arcsec as stated in the paper, but pixels.
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(End)                         James Marcout, Patricia Bauer [CDS]    06-Mar-2000