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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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) d = previously discovered by Durrell et al. (2007ApJ...656..746D) e = previously discovered by Durrell (1997AJ....113..531D)
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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
Note (1): Objects without VCC index are spectroscopically confirmed Virgo cluster members.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Apr-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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