J/ApJ/528/123 KRI photometry of galaxies near B2 1335+28 (Tanaka+, 2000)
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 2000ApJ...528..123T
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:
------------------------------------------------
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
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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 KMB 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° 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 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
() and Marion Schmitz
(), it appeared that the (x,y) values are
not arcsec as stated in the paper, but pixels.
(End) James Marcout, Patricia Bauer [CDS] 06-Mar-2000