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J/AJ/101/1561 Isophotometry of ellipticals in Abell clusters (Porter+ 1991)
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CCD observations of Abell clusters. V. Isophotometry of 175 brightest
elliptical galaxies in Abell clusters
Porter A.C., Schneider D.P., Hoessel J.G.
<Astron. J. 101, 1561 (1991)>
=1991AJ....101.1561P
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ADC_Keywords: Clusters, galaxy; Photometry, CCD
Keywords: galaxies: clustering - galaxies: isophotometry - galaxies: elliptical
Abstract:
Profiles of major- and minor-axis surface brightness, ellipticity, position
angle, and isophote centroid are presently derived from isophotometry for
a sample of 175 brightest cluster ellipticals (BCEs). The BCEs' average
ellipticity is a sharply rising function of metric radius; less than a
fourth of the sample exhibits significant ellipticity decrease with
increasing radius. While at radii of less than 16 kpc the BCEs are
rounder than the average elliptical, they become too flattened at radii
greater than 30 kpc to represent a randomly-oriented oblate-spheroid
population. These results indicate that BCE outer regions are dynamically
strongly coupled to their either prolate or stringy clusters.
Notes:
* The original file is in TeX form with a macro file. Conversion from
TeX to ASCII form is made by H.Andernach.
* The number of entries of table1 is 176 because a cD galaxy NGC4874
is included after the brightest cluster elliptical of A1656 (see paper
p1576).
* "BCE" stands for "brightest cluster elliptical(s)".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . this file
table1 63 176 isophotometry of BCE
tb1.tex 97 268 TeX file of Table 1
macro.tex 85 98 macro file for tb1.tex
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Byte-by-byte Description of file: table1
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Bytes Format Unit Label Explanation
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1 A1 --- NGC [N] 'N' denotes that the following number is
of NGC; in other case (' '), is of Abell
2- 5 I4 --- ABELL [0,] Abell cluster number
* If NGC='N' then NGC number
7- 13 F7.4 --- Z redshift of the BCE
16- 19 F4.2 arcsec SEEING [0,] FWHM of the seeing in the CCD image
22- 25 F4.2 --- E4 [0,1]? ellipticity for semimajor axis of
4 kpc
* Blank space means the BCE was not
observed at that radius, or the isophoto
was discarded (see paper p1576r)
28- 31 F4.2 --- E16 [0,1]? above of 16 kpc
34- 37 F4.2 --- E64 [0,1]? above of 64 kpc
40- 42 I3 deg PA4 [0,360[? position angle of the major-axis
of 4 kpc (see E4 above)
45- 47 I3 deg PA16 [-8/352]? above of 16 kpc
50- 52 I3 deg PA64 [0,360[? above of 64 kpc
54- 57 A4 --- decr_E [cpxe"~<>0 ] if ellipticity decreasing
outwards anywhere in its profile:
e" = 2nd outward derivative of E,
~ = nearly equal, cpx = complex
59 A1 --- const_E [Y] 'Y' denotes constant ellipticity
61 A1 --- TWIST [Y] 'Y' denotes significant isophoto
twisting
63 A1 --- ASYM [Y] 'Y' denotes significant asymmetry
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Historical notes:
The catalogue was provided by courtesy of A.C.Porter to H. Andernach;
it was numbered A152 in H. Andernach's "List of Astronomical Catalogues
and Documents kindly provided on request by various authors"
16-Apr-1994: First archived.
(The date of the latest archiving, see the date of each file.)
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(End) Koichi Nakajima [CDS] 07-Dec-1993