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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
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) ------------------------------------------------ 13 38 07.5 +28 05 11 B2 1335+28 ------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 54 103 K-selected object catalog
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
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
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). 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)
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
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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