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J/other/BASI/30.911   BVRI CCD photometry of 4 galaxy clusters   (Sharma+, 2002)

Photometric catalogs of four EMSS poor clusters of galaxies. Sharma M., Prabhu T.P. <Bull. Astron. Soc. India, 30, 911 (2002)> =2002BASI...30..911S
ADC_Keywords: Clusters, galaxy ; Photometry, CCD ; Photometry, UBVRI ; Photometry, Cousins Abstract: We have used the 2.3-meter Vainu Bappu Telescope to perform CCD imaging of X-ray-selected poor clusters of galaxies. Our sample consists of four X-ray luminous clusters in the Einstein Observatory Extended Medium Sensitivity Survey (EMSS) and noted by Gioia & Luppino (1994ApJS...94..583G) to be optically less rich than Abell clusters. The sample spans a redshift range of 0.08≤z≤0.22. We have assembled catalogs of galaxies detected in the cluster fields to a magnitude limit mV∼22. This paper describes the data reduction performed on the CCD images, the methods used to construct the extended object catalogs, the photometric calibrations, and some understanding of their completeness and contamination. Description: We acquired optical imaging observations at the prime focus of the 2.34-m Vainu Bappu Telescope (VBT), at the Vainu Bappu Observatory (VBO), Kavalur, India. The observatory (longitude 78.8°E, latitude 12.5°N, altitude 730m above sea level) is operated by the Indian Institute of Astrophysics, Bangalore. We employed the following filters in our observations: broad-band blue, visual, red and near infra-red (approximating the standard B, V, R and I photometric bands). We chose to transform our instrumental magnitudes to the standard Johnson-Morgan BV and Kron-Cousins RcIc broadband systems using the old Galactic cluster M67 for which many studies are available. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 00 05 22.6 +16 12 38 MS 0002.8+1556 03 04 30. +15 27 54 MS 0301.7+1516 07 41 50. +74 14 48 MS 0735.6+7421 13 09 16.1 -01 36 58 MS 1306.7-0121 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 50 361 Catalog of galaxies in the field of MS 0002.8+1556 table7.dat 50 224 Catalog of galaxies in the field of MS 0301.7+1516 table8.dat 50 239 Catalog of galaxies in the field of MS 0735.6+7421 table9.dat 50 229 Catalog of galaxies in the field of MS 1306.7-0121 tables.tex 74 1307 LaTeX version of the tables
See also: IX/15 : Einstein EMSS Survey (Gioia+ 1990, Stocke+ 1991) J/A+A/378/30 : ROSAT-BSC galaxy identifications (Zimmermann+, 2001) J/ApJS/129/435 : NORAS galaxy cluster survey. I. (Bohringer+, 2000) J/ApJ/511/65 : Einstein images of galaxy clusters (Jones+, 1999) Table 1: Properties of the poor clusters -------------------------------------------------------------------------------- Cluster RA (J2000) DE LX z MB AV -------------------------------------------------------------------------------- MS 0002.8+1556 00:05:25.1 +16:13:24.1 1.64 0.116 16.0 0.158 MS 0301.7+1516 03:04:30.4 +15:27:53.0 0.33 0.083 16.9 0.554 MS 0735.6+7421 07:41:50.1 +74:14:01.4 6.12 0.216 17.7 0.077 MS 1306.7-0121 13:09:18.0 -01:37:21.4 1.70 0.088 16.0 0.094 Column Explanations: LX: Einstein X-ray luminosity in 10+44erg/s (10+37W) z: spectroscopic redshift MB: apparent magnitude of the brightest cluster galaxy (in mag) AV: Galactic extinction in the V-band (in mag) Table 2: Galactic extinction corrections in magnitudes, in the four bands towards the EMSS poor clusters studied in this work. -------------------------------------------------------------------------------- EMSS Cluster GLAT AB AV AR AI deg mag mag mag mag -------------------------------------------------------------------------------- MS 0002.8+1556 -45.23 -- 0.16 0.13 -- MS 0301.7+1516 -36.56 0.72 0.55 0.45 0.33 MS 0735.6+7421 +29.44 0.10 0.08 0.06 0.04 MS 1306.7-0121 +60.93 0.12 0.09 0.08 0.06 Byte-by-byte Description of file: table6.dat table7.dat table8.dat table9.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right Ascansion (J2000) 3 A1 --- --- [:] 4- 5 I2 min RAm Right Ascansion (J2000) 6 A1 --- --- [:] 7- 10 F4.1 s RAs Right Ascansion (J2000) 12 A1 --- DE- Declination sign (J2000) 13- 14 I2 deg DEd Declination (J2000) 15 A1 --- --- [:] 16- 17 I2 arcmin DEm Declination (J2000) 18 A1 --- --- [:] 19- 20 I2 arcsec DEs Declination (J2000) 23- 27 F5.2 mag Vmag ? Johnson-Morgan V magnitude 30- 34 F5.2 mag B-V ? Johnson-Morgan B-V colour index 38- 42 F5.2 mag V-Rc ? Vj-Rc colour index 46- 50 F5.2 mag Rc-Ic ? Kron-Cousins R-I colour index
Nomenclature Notes: Objects are identified as [SP2002] JHHMMSS.s+DDMMSS in Simbad Acknowledgements: Mangala Sharma
(End) Patricia Bauer [CDS] 23-Jun-2003
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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