J/MNRAS/211/637 Abell 85 CCD observations (Murphy 1984)
CCD camera observations of nearby rich clusters -
II. Techniques and results for A85
Murphy H.P.
<Mon. Not. R. Astron. Soc. 211, 637 (1984)>
=1984MNRAS.211..637M 1984MNRAS.211..637M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Morphology ; Photometry, CCD
Abstract:
A CCD camera survey has been conducted of the X-ray emitting regions
of a sample of clusters of galaxies. This sample includes at least one
cluster from each of the classes in the new Forman-Jones
classification scheme (Forman & Jones 1982ARA&A..20..547F 1982ARA&A..20..547F). In this
paper, the techniques used to obtain, reduce and analyse the data are
presented, along with results for the cluster Abell 85. For the
central X-ray emitting region of this cluster, a core radius of
between 1.2 and 1.6Mpc is estimated from the galaxy radial number
density distribution. The properties of the galaxies in the core of
this cluster are significantly different from those of the galaxies in
the outer regions of the area covered in the survey, in terms of
luminosity function and colour distribution.
Objects:
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RA (2000) DE Designation(s)
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00 41.6 -09 22 Abell 85 = ACO 85
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 58 174 Optical parameters for the galaxies in A85
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See also:
1983MNRAS.202.1127M 1983MNRAS.202.1127M : Murphy et al., Paper I. R phot. of brightest galaxies
Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Object sequential number
5- 10 F6.1 pix Xpos X position (1)
12- 17 F6.1 pix Ypos Y position (1)
19- 22 F4.2 --- Eps Ellipticity
24- 27 F4.1 arcsec MajAxis Semi-major axis
29- 31 I3 arcsec Ang Orientation
33- 37 F5.2 mag Fmag F magnitude (red, close to Gunn rF)
39- 43 F5.2 mag F-J ? F-J colour index (J, blue, close to Gunn bJ)
45- 49 F5.2 arcsec Reff Effective radius
51- 53 I3 --- IntPeak Peak intensity (in digital counts)
55- 58 F4.2 % Pg Probability of galaxy nature (2)
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Note (1): The X and Y coordinates are included here solely for identification
purposes; thev are in general subject to some uncertainty due to the
difficulty in merging non-overlapping fields.
Note (2): Only objects with Pg>0.5 are listed here. (1=galaxies, 0=stars)
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Table 4: Differential magnitude counts of objects classified in Abell 85.
The bins are symmetric about each magnitude. The defects were
detected and removed by hand; obvious (brighter) defects were not
included in the original object extraction process.
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Mag Stars Galaxies Defects Background
Pg>0.9 0.9>Pg>0.5
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11 2 0 0 0 0
12 2 0 0 0 0
13 4 1 0 0 0
14 4 1 0 0 0
15 6 2 0 0 0
16 4 8 1 0 1
17 3 24 2 0 2
18 1 44 5 2 4
19 2 68 0 11 8
20+ 0 17 1 8 -
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 18-Mar-1997