J/A+A/430/411 B-band photometry of ellipticals in Virgo (Gavazzi+, 2005)
The structure of elliptical galaxies in the Virgo cluster.
Results from the INT Wide Field Survey.
Gavazzi G., Donati A., Cucciati O., Sabatini S., Boselli A., Davies J.,
Zibetti S.
<Astron. Astrophys. 430, 411 (2005)>
=2005A&A...430..411G 2005A&A...430..411G
ADC_Keywords: Clusters, galaxy ; Photometry, CCD ; Morphology
Keywords: galaxies: elliptical and lenticular, cD -
galaxies: fundamental parameters -
galaxies: clusters: individual: Virgo
Abstract:
We report on a complete CCD imaging survey of 226 elliptical galaxies
in the North-East quadrant of the Virgo cluster, representative of the
properties of giant and dwarf elliptical galaxies in this cluster. We
fit their radial light profiles with the Sersic r1/n model of light
distribution. We confirm the result of Graham & Guzman
(2003AJ....125.2936G 2003AJ....125.2936G) that the apparent dichotomy between E and dE
galaxies in the luminosity-<µ>e plane no longer appears when
other structural parameters are considered and can be entirely
attributed to the onset of "core" galaxies at BT~-20.5mag. When
"core" galaxies are not considered, E and dE form a unique family
with n linearly increasing with the luminosity. For 90 galaxies we
analyze the B-I color indices, both in the nuclear and in the outer
regions. Both indices are bluer toward fainter luminosities. We find
also that the outer color gradients do not show any significant
correlation with the luminosity. The scatter in all color indicators
increases significantly toward lower luminosities, e.g. galaxies
fainter than BT~-15 have a B-I spread>0.5mag.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 226 B-band parameters of the observed galaxies
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See also:
J/A+AS/106/199 : B-band photometry in Fornax and Virgo (Caon+ 1994)
J/A+AS/127/367 : Virgo Photometry Catalogue (VPC) (Young+ 1998)
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
J/AJ/108/1598 : Virgo cluster ellipticals. III. (Ferrarese+, 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- VCC VCC designation of the galaxy
6- 8 A3 --- OName Other name of the galaxy
10- 11 A2 --- MType Morphological type from the VCC
dE: dwarfs elliptical, E: giant elliptical
13 A1 --- n_MType [N-] N: Nucleated
15- 19 F5.2 mag Pmag Photographic magnitude m[p] from the VCC.
21- 24 F4.2 --- Sersic Sersic index n
26- 30 F5.2 mag/arcsec2 SuBr0 Sersic extrapolation to r=0 of the central
surface brightness µ0
32- 36 F5.2 mag BTmag Total asymptotic magnitude B[T]
38- 42 F5.2 --- C31 Light concentration index C[31]
44- 48 F5.2 mag/arcsec2 SuBre Mean effective surface brightness
50- 54 F5.2 arcsec re Effective major-axis radius r[e]
56 A1 --- WFS [HV] Horizontal (H) or vertical (V)
strip (1)
58- 60 A3 --- Bands Available band(s)
62- 66 A5 --- Notes Notes (2)
68- 82 A15 --- Ref Reference to other works (3)
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Note (1): The imaging data are taken from the Wide Field Survey (WFS),
horizontal (H) and vertical (V) strip delimited by the solid
rectangle in Fig. 1.
Note (2): Notes are numbered as follows:
1 = poor outer fit
2 = M32 like object
3 = two seeing disks excluded from the fit
4 = core
5 = power law
6 = saturated
Note (3): References are coded as follows:
B03 = Barazza et al., 2003A&A...407..121B 2003A&A...407..121B
F97 = Faber et al., 1997AJ....114.1771F 1997AJ....114.1771F
VPC = Young & Currie, 1998, Cat. J/A+AS/127/367
BJ98 = Binggeli & Jerjen, 1998A&A...333...17B 1998A&A...333...17B
ACS = in The ACS Virgo Cluster Survey,
Cote et al., 2004 Cat. J/ApJS/153/223,
Jordan et al., 2004, Cat. J/ApJS/154/509, J/ApJ/613/279
ASC* = whether core or power law, kindly provided by Laura Ferrarese
(private communication).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Jan-2005