J/ApJ/660/1186 VCC galaxies classification with SDSS (Lisker+, 2007)
Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey.
III. Subpopulations: distributions, shapes, origins.
Lisker T., Grebel E.K., Binggeli B., Glatt K.
<Astrophys. J., 660, 1186-1197 (2007)>
=2007ApJ...660.1186L 2007ApJ...660.1186L
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Morphology
Keywords: galaxies: clusters: individual (Virgo) - galaxies: dwarf -
galaxies: evolution - galaxies: fundamental parameters -
galaxies: statistics - galaxies: structure
Abstract:
From a quantitative analysis of 413 Virgo Cluster early-type dwarf
galaxies (dEs) with SDSS imaging data, we find that the dE class can
be divided into multiple subpopulations that differ significantly in
their morphology and clustering properties. Three dE subclasses are
shaped like thick disks and show no central clustering: (1) dEs with
disk features like spiral arms or bars, (2) dEs with central star
formation, and (3) ordinary, bright dEs that have no or only a weak
nucleus.
Description:
While our dE sample selection was already described in Papers I and II
(Lisker et al., 2006AJ....132..497L 2006AJ....132..497L and 2006AJ....132.2432L 2006AJ....132.2432L) of this
series, these studies were still based on the Data Release 4 of the
Sloan Digital Sky Survey (SDSS). Since we are now using the full SDSS
Data Release 5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 25 413 Subclass assignment
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See also:
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
http://www.sdss.org/ : The SDSS Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- VCC Galaxy Virgo Cluster Catalog number
6- 19 A14 --- sClass Galaxy subclass (1)
21- 25 F5.2 --- rmag The r band magnitude (2)
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Note (1): Classification of a dE as nucleated or non-nucleated is provided
by the VCC (Binggeli et al., 1985, Cat. J/AJ/90/1681). Of the dEs that
do not display disk substructure or a blue center, those with a small
uncertainty on the presence of a nucleus (N:) were included in the
nucleated subclass, while those with a larger uncertainty (N?, Npec)
were not assigned to any subclass (blank entry), but were excluded
from all comparisons of dE subclasses. Objects VCC 0218, 0308, 1684,
and 1779 are dE(bc)s with disk features.
Note (2): Sky subtraction and photometry performed by the authors as
outlined in Section 4 of the paper.
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History:
From electronic version of the journal
References:
Lisker et al., Paper I 2006AJ....132..497L 2006AJ....132..497L
Lisker et al., Paper II 2006AJ....132.2432L 2006AJ....132.2432L
Lisker et al., Paper Iv 2008AJ....135..380L 2008AJ....135..380L
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Mar-2009