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 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 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:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table6.dat 47 361 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
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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
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Cluster RA (J2000) DE LX z MB AV
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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
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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)
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Table 2: Galactic extinction corrections in magnitudes, in the four bands
towards the EMSS poor clusters studied in this work.
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EMSS Cluster GLAT AB AV AR AI
deg mag mag mag mag
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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
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Byte-by-byte Description of file: table6.dat table7.dat table8.dat table9.dat
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Bytes Format Units Label Explanations
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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
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Nomenclature Notes:
Objects are identified as [SP2002] JHHMMSS.s+DDMMSS in Simbad
Acknowledgements: Mangala Sharma
(End) Patricia Bauer [CDS] 23-Jun-2003