CDROM/APJS/V97/P077
Catalog of Coma Cluster Galaxies (Doi+ 1995)
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Automated Surface Photometry for the Coma Cluster Galaxies: The Catalog
M. Doi, M. Fukugita, S. Okamura, & K. Tarusawa
<1995, ApJS, 97, 77>
=1995ApJS...97...77D
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Abstract:
A homogeneous photometry catalog is presented for 450 galaxies with
B_25.5 <= 16 mag located in the 9.8 deg x 9.8 deg region centred on
the Coma Cluster. The catalog is based on photographic photometry
using an automated surface photometry software for data reduction
applied to B-band Schmidt plates. The catalog provides accurate
positions, isophotal and total magnitudes, major and minor axes, and a
few other photometric parameters including rudimentary morphology
(early or late type).
Keywords: galaxies: clusters: individual (Coma) -- galaxies: fundamental
parameters -- galaxies: photometry
File Summary:
------------------------------------------------------------------------------File Name
Lrecl
Records
Explanations
------------------------------------------------------------------------------table1.dat
103
479
Catalog
------------------------------------------------------------------------------Byte-by-byte Description of file: table1.dat
------------------------------------------------------------------------------Bytes Format Units
Label
Explanations
------------------------------------------------------------------------------1- 3
I3
--Num
Internal number
4
1X
----Blank
5-12
A8
--CGCG
Identification from CGCG
13-18
A6
--NGC_IC
Identification from NGC/IC catalogs
19-24
A6
--UGC
Identification from UGC
25-32
I8
--cz
[]? Redshift from CfA redshift survey
33
1X
----Blank
34-35
I2
h
RAh
*Right ascension (1950.0)
36-37
I2
min
RAm
R.A.
38-42
F5.2
s
RAs
R.A.
43
1X
----Blank
44
A1
--DEDeclination sign, always blank
45-46
I2
deg
DEd
*Declination (1950.0)
47-48
I2
arcmin DEm
Dec.
49-52
F4.1
arcsec DEs
Dec.
53
1X
----Blank
54
A1
--Blend
*[AM] Deblending flag
55-60
F6.2
mag
B_25.5 *Isophotal magnitude B_25.5.
61-66
F6.2
mag
B_t
*[]? Total magnitude B_t
67-72
F6.1
arcsec a
*Semimajor axis at 25.5 mag/arcsec2
73-78
F6.1
arcsec b
*Semiminor axis at 25.5 mag/arcsec2
79-82
I4
deg
PA
Position angle of major axis
83-88
F6.2
mag
SB_25.5 *Mean surface brightness
89-94
F6.3
--c_in
Concentration index defined by eq. 2 in
paper
95-99
F5.1
arcsec r_e25.5 *Effective radius
100
1X
----Blank
101
A1
--Type
*[ELU] E=early, L=late, U=unclassified
102
1X
----Blank
103
A1
--Star
*[*] Objects found to be blended stars
------------------------------------------------------------------------------Notes for file: table1.dat
------------------------------------------------------------------------------RAh, DEd:
Accuracy of equatorial coordinates are 0.6 arcsec (rms).
Blend:
'A' and 'M' denote that these galaxies are deblended either
automatically or manually. Manual deblending was done, when topology
of the overlapping objects does not allow a unique solution, or when
blended images are so large or complex that the deblending procedure
requires too much computer memory. Photometric parameters may not
be accurate for galaxies with these flags.
B_25.5:
The mean error is estimated to be 0.1 mag.
B_t:
The total magnitude is obtained by fitting the growth curve at the
three faintest isophotal levels (dividing the intensity range
between the peak and the threshold, 25.5 mag/s, into 20 levels) to
the fiducial growth curves expected for the de Vaucouleurs profile
(for E-type galaxies) and the exponential profile (for L-type
galaxies), and then by reading the magnitude at 5 times the
effective radius. For U-type galaxies, we average the two values
obtained from the two profiles. Note that the definition of this
total magnitude differs from that of B_T (defined by RC2) commonly
used in the literature; the offset between the two total magnitudes
is found to be ~0.03 mag (B_t is brighter). When a good fit is not
obtained for the three points, B_t is not listed.
a, b:
Semimajor and semiminor axes at a surface brightness level of 25.5
mag/arcsec^2. 7-10% errors are expected for both parameters.
SB_25.5:
Mean surface brightness defined by equation (3) in the printed paper
with mu_L = 25.5 mag/arcsec^2.
r_e25.5:
Effective radius that contains half the flux of B_25.5.
Type:
Morphology: 'E' (early, E-S0) or 'L' (late, Sa-Im), according to the
criterion discussed in section 2 of the printed paper. The
confidence level of the coincidence with RC3 morphology (early or
late) is 87.5%. 'U' denotes a galaxy which is unclassified.
Star:
The objects are marked by asterisks when they are classified as
galaxies by the automated software, but turned out to be blended
stars ("double" stars) upon visual inspection.
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(End)
Lee Brotzman [ADS]
08-May-95