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J/A+AS/134/59 The central Fornax Cluster. I. Galaxy photometry (Hilker+ 1999)
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The central region of the Fornax cluster. I. A catalog and photometric
properties of galaxies in selected CCD fields
Hilker M., Kissler-Patig M., Richtler T., Infante L., Quintana H.
<Astron. Astrophys. Suppl. Ser. 134, 59 (1999)>
=1999A&AS..134...59H (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, galaxy ; Galaxies, photometry
Keywords: galaxies: clusters: individual: Fornax cluster -
galaxies: fundamental parameters - galaxies: photometry - catalogs -
galaxies: dwarf
Description:
In this paper, a photometric catalog is presented of V and I
photometry of galaxies in the central regions of the Fornax galaxy
cluster. Our 11 CCD fields cover 0.17 square degrees in total. The
limiting surface brightness is around 24mag/arcsec^2^, similar to that
of Ferguson's (1989, Cat. <VII/180>) catalog, whereas our limiting
total magnitude is around V=22mag, about two magnitudes fainter. The
photometric properties of more than 870 objects are presented as a
catalog (Appendix A). The properties and fit parameters of the surface
brightness profiles for a sub-sample are presented in a second catalog
(Appendix B). Four new dwarf galaxies are added to Ferguson's catalog.
However, we confirm that the dwarf galaxies in Fornax follow a similar
surface brightness -- magnitude relation as the Local Group dwarfs.
They also follow the color (metallicity) -- magnitude relation seen in
other galaxy clusters. A formerly suspected excess of dwarf galaxies
surrounding the central giant cD galaxy NGC 1399 can be explained by
the superposition of a background cluster at z=0.11 (Hilker et al.
1998, Cat. <J/A+AS/134/75>, Paper II in this series).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
appendxa.dat 96 873 Photometric catalog
appendxb.dat 119 192 Catalog of profile fit parameters
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See also:
VII/180 : Galaxies in 3.5 degs of Fornax cluster (Ferguson+ 1989)
J/A+AS/134/75 : Paper II. Galaxy spectroscopy (Hilker+ 1999)
Byte-by-byte Description of file: appendxa.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- CGF Catalog name of the object (1)
10 A1 --- n_CGF [*] *: objects that are also listed in
appendb.dat file
13 I1 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
38- 42 F5.2 mag Vtot Total V apparent magnitude
44 A1 --- nbo [n] Neighbouring object (2)
47- 51 F5.2 mag/arcsec2 sbVp V peak surface brightness
54- 58 F5.2 mag V-I ? (V-I) color within 3 arcsec aperture
61- 64 F4.2 --- ell ? Ellipticity, ell = 1 - b/a
67- 71 F5.1 deg PA [-90/90] Position angle of the major axis (3)
74- 77 F4.1 arcsec aphot Size of the major axis
80- 83 F4.1 arcsec d26 ? Size of major axis at sbV = 26 mag/arcsec2
86- 89 F4.1 arcsec aeff ? Effective semi-major axis
92- 96 F5.2 mag/arcsec2 sbVeff V effective surface brightness
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Note (1):
The catalog names are prefixed by the acronym CGF (Catalog of
Galaxies in Fornax) followed by a sequence number of the field and the
sequence number of the galaxy in this field (ordered with decreasing
magnitude). In the catalog the galaxies are ordered by increasing
right ascension.
Note (2):
The letter "n" indicates that a neighbouring object is present within
two isophotal radii.
Note (3):
0 degree is in east direction, positive angles towards the south,
and negative angles towards the north direction
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Byte-by-byte Description of file: appendxb.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- CGF Catalog name of the object (see Appendix A)
12 I1 h RAh Right ascension (J2000)
14- 15 I2 min RAm Right ascension (J2000)
17- 21 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 34 F4.1 arcsec DEs Declination (J2000)
37- 44 A8 --- MType Morphological Type
47- 51 F5.2 mag Vtot Total V apparent magnitude
53 A1 --- nbo Neighboring object (see Appendix A)
56- 58 F3.1 arcsec rcap Apparent core radius (1)
61- 63 F3.1 arcsec rccor ? Corrected core radius (using
Kormendy 1985ApJ...295...73K)
66- 70 F5.2 mag/arcsec2 sbVcor ? Corrected central surface brightness (sb)
73- 76 F4.2 --- nsers ? Exponent of Sersic (1968, Atlas de galaxias
australes) profile fit
79- 83 F5.2 mag/arcsec2 sbVser ? Central surface brightness of Sersic fit
86- 89 F4.2 arcsec r0sers ? Scale length of Sersic profile fit
92- 96 F5.2 mag/arcsec2 sbVdV ? Central sb of de Vaucouleurs profile fit
99-103 F5.2 arcsec refdV ? Effective radius of de Vaucouleurs profile
106-110 F5.2 mag/arcsec2 sbVexp ? Central sb of exponential profile fit
112-116 F5.2 arcsec alpha ? Scale length of exponential profile fit
119 A1 --- flag [bdne] Exponential profile fit flag (2)
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Note (1):
Radius where the apparent central surface intensity has its half
value
Note (2): the meaning of the flag is:
b: bulge is present
d: light deficiency in the center
n: nucleus present
e: exponential law at all radii
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References:
Sersic J.-L., 1968, Atlas de galaxias australes, Observatorio Astronomica,
Cordoba
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(End) M. Hilker [Pontifica Universidad Catolica, Santiago] 30-Jun-1998