J/A+AS/140/155 Abell 496 gri photometry (Moretti+, 1999)
The luminosity function of cluster galaxies.
II. Data reduction procedures applied to the cluster Abell 496.
Moretti A., Molinari E., Chincarini G., De Grandi S.
<Astron. Astrophys. Suppl. Ser. 140, 155 (1999)>
=1999A&AS..140..155M 1999A&AS..140..155M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Photometry, CCD
Keywords: galaxies: photometry - galaxies: cluster: general
Abstract:
We initiated a large project aimed to estimate the Luminosity Function
of galaxies in clusters and to evaluate its relation to cluster
morphology. With this paper we deem necessary to outline the general
procedures of the data reduction and details of the data analysis. The
cluster sample includes the brightest southern ROSAT all-sky survey
clusters with z<0.1 . These have been observed in three colours
g, r, i, and mapped up to a few core radii using a mosaic of CCD
frames. E/S0 galaxies in the cluster core are singled out both by
morphology (for the brightest galaxies), and by colour. The details of
the data reduction procedure are illustrated via the analysis of the
cluster Abell 496, which has been used as a pilot cluster for the
whole program. The related photometric catalogue consists of 2355
objects. The limiting magnitudes (the reference Surface Brightness is
given in parenthesis) in the various colours are respectively
g(25.5)=24.14, r(25.5)=24.46, i(25.0)=23.75. These correspond to the
limiting absolute magnitudes -12.28, -11.96 and -12.67
(H0=50km/s/Mpc).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
mostra.dat 65 2355 Abell 496 photometric catalogue
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See also:
J/A+AS/139/525 : Abell 496 heliocentric velocities (Durret+, 1999)
J/A+AS/139/559 : Abell 496 photometric catalogue (Slezak+, 1999)
Byte-by-byte Description of file: mostra.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 h RAhr Right Ascension (J2000)
10- 17 F8.4 deg DEdeg Declination (J2000)
19- 23 F5.2 mag gmag ? Isophotal Gunn g magnitude (25.5)
25- 29 F5.2 mag rmag ? Isophotal Gunn r magnitude (25.5)
31- 35 F5.2 mag imag ? Isophotal Gunn i magnitude (25.0)
37- 40 F4.1 arcsec gRad ? Isophotoal Gunn g radius
42- 45 F4.1 arcsec rRad ? Isophotoal Gunn r radius
47- 50 F4.1 arcsec iRad ? Isophotoal Gunn i radius
52- 56 F5.2 mag g-r ? g-r colour index
58- 62 F5.2 mag g-i ? g-i color index
65 I1 --- Class [0,1] 1 = galaxy 0=star
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Acknowledgements: Alberto Moretti
References:
Molinari et al, Paper I 1998A&A...338..874M 1998A&A...338..874M
(End) Patricia Bauer [CDS] 10-Apr-2000