J/A+A/538/A69 Virgo early-type galaxies optical properties (Lieder+, 2012)
A deep view on the Virgo cluster core.
Lieder S., Lisker T., Hilker M., Misgeld I., Durrell P.
<Astron. Astrophys., 538, A69 (2012)>
=2012A&A...538A..69L 2012A&A...538A..69L
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry
Keywords: galaxies: photometry - galaxies: clusters: general -
galaxies: evolution - galaxies: dwarf - galaxies: formation -
galaxies: clusters: individual: Virgo
Abstract:
Studies of dwarf spheroidal (dSph) galaxies with statistically
significant sample sizes are still rare beyond the Local Group, since
these low surface brightness objects can only be identified with deep
imaging data. In galaxy clusters, where they constitute the dominant
population in terms of number, they represent the faint end slope of
the galaxy luminosity function and provide important insight on the
interplay between galaxy mass and environment. In this study we
investigate the optical photometric properties of early-type galaxies
(dwarf ellipticals (dEs) and dSphs) in the Virgo cluster core region,
by analysing their location on the colour magnitude relation (CMR) and
the structural scaling relations down to faint magnitudes, and by
constructing the luminosity function to compare it with theoretical
expectations.
Description:
Our work is based on deep CFHT V- and I-band data covering several
square degrees of the Virgo cluster core that were obtained in 1999
using the CFH12K instrument. We visually select potential cluster
members based on morphology and angular size, excluding spiral
galaxies. A photometric analysis has been carried out for 295
galaxies, using surface brightness profile shape and colour as further
criteria to identify probable background contaminants. 216 galaxies
are considered to be certain or probable Virgo cluster members.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 76 77 Properties of Virgo cluster objects found in
this study but not included in the VCC
table4.dat 85 139 Properties of VCC catalogued galaxies and
spectroscopically confirmed cluster members
investigated in this study
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See also:
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
J/MNRAS/333/423 : Luminosity function of the Virgo Cluster (Trentham+, 2002)
J/MNRAS/335/712 : R magnitude of cluster of galaxies (Trentham+, 2002)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/77] Galaxy sequential number
4- 12 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
14- 22 F9.5 deg DEdeg Declination in decimal degrees (J2000)
24- 29 F6.2 mag VMAG Absolute V magnitude in Virgo cluster distance
(adopted m-M=31.09mag)
31- 34 F4.2 mag e_VMAG rms uncertainty on VMAG
36- 41 F6.2 mag IMAG Absolute I magnitude in Virgo cluster distance
(adopted m-M=31.09mag)
43- 46 F4.2 mag e_IMAG rms uncertainty on IMAG
48- 52 F5.3 mag V-I V-I colour index computed by the flux enclosed
by an ellipse with half-light radius r50
54- 58 F5.3 mag e_V-I rms uncertainty on V-I
60- 63 F4.2 --- ell Ellipticity at half-light aperture
65- 68 I4 pc r50 half-light radius determined by the half-light
semi-major axis a50 and ellipticity of an
ellipse by r50=a50SQRT(1-ell)
70- 74 F5.2 mag/arcsec2 mueV Effective surface brightness in V-Band
determined by the ellipse enclosing half of
the total flux
76 A1 --- Ref Literature reference catalogue if object was
previously found (1)
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Note (1): Reference as follows:
a = previously discovered by Trentham & Tully 2002, Cat. J/MNRAS/335/712
b = previously discovered by Trentham & Hodgkin 2002, Cat. J/MNRAS/333/423
c = previously discovered by Impey et al. (1988ApJ...330..634I 1988ApJ...330..634I)
d = previously discovered by Durrell et al. (2007ApJ...656..746D 2007ApJ...656..746D)
e = previously discovered by Durrell (1997AJ....113..531D 1997AJ....113..531D)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- VCC ? Galaxy VCC number (Binggeli et al.,
Cat. J/AJ/90/1681) (1)
6- 12 F7.4 --- z ? Redshift taken from NED
14- 22 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
24- 32 F9.5 deg DEdeg Declination in decimal degrees (J2000)
34- 39 F6.2 mag VMAG Absolute V magnitude in Virgo cluster distance
(adopted m-M=31.09mag)
41- 44 F4.2 mag e_VMAG rms uncertainty on VMAG
46- 51 F6.2 mag IMAG Absolute I magnitude in Virgo cluster distance
(adopted m-M=31.09mag)
53- 56 F4.2 mag e_IMAG rms uncertainty on IMAG
58- 62 F5.3 mag V-I V-I colour index computed by the flux enclosed
by an ellipse with half-light radius r50
64- 68 F5.3 mag e_V-I rms uncertainty on V-I
70- 73 F4.2 --- ell Ellipticity at half-light aperture
75- 79 I5 pc r50 half-light radius determined by the half-light
semi-major axis a50 and ellipticity of an
ellipse by r50=a50SQRT(1-ell)
81- 85 F5.2 mag/arcsec2 mueV Effective surface brightness in V-Band
determined by the ellipse enclosing half of
the total flux
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Note (1): Objects without VCC index are spectroscopically confirmed Virgo
cluster members.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Apr-2012