J/MNRAS/363/1019 Nucleated dwarf ellipticals in Virgo cluster (Grant+, 2005)
Nucleated dwarf elliptical galaxies in the Virgo cluster.
Grant N.I., Kuipers J.A., Phillipps S.
<Mon. Not. R. Astron. Soc., 363, 1019-1030 (2005)>
=2005MNRAS.363.1019G 2005MNRAS.363.1019G
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Morphology
Keywords: galaxies: dwarf - galaxies: fundamental parameters -
galaxies: nuclei - galaxies: photometry
Abstract:
Using images from a charge-coupled device survey with the Wide Field
Camera on the Isaac Newton Telescope, we performed B- and I-band
photometry on 156 Virgo cluster dwarf elliptical (dE) galaxies, 25
candidate new cluster dwarfs, and nine candidate field dwarfs.
Description:
We used CCD images from the INT WFC survey, a multicolour survey
covering around 200deg2. The camera consists of four thinned EEV
2kx4k chips with pixel scale 0.33-arcsec, giving a field of view for
each chip of 11.4x22.8arcmin2. Data for the Virgo cluster part of
the survey were obtained during observing runs between 1999 April and
2002 March.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 90 181 Coordinates, profile types, ellipticities, magnitudes
and probabilities of cluster membership for
Virgo Cluster galaxies
tablea2.dat 90 9 Coordinates, profile types, ellipticities, magnitudes
and probabilities of being at the distance of the
Virgo Cluster for field galaxies
tableb1.dat 86 181 Sersic profile parameters for cluster galaxies, B band
tableb2.dat 86 181 Sersic profile parameters for cluster galaxies, I band
tableb3.dat 86 9 Sersic profile parameters for field galaxies, B band
tableb4.dat 86 9 Sersic profile parameters for field galaxies, I band
tablec1.dat 50 181 Fractional nuclear luminosities and types of colour
gradient for cluster galaxies
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See also:
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
J/A+AS/127/367 : Virgo Photometry Catalogue (VPC) (Young+ 1998)
J/AJ/108/1598 : Virgo cluster ellipticals. III. (Ferrarese+, 1994)
J/ApJ/517/650 : Surface photometry of dwarf galaxies in Virgo (Ryden+, 1999)
J/MNRAS/333/423 : Luminosity function of the Virgo Cluster (Trentham+, 2002)
J/A+A/430/411 : B-band photometry of ellipticals in Virgo (Gavazzi+, 2005)
Byte-by-byte Description of file: tablea[12].dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Seq Sequential number (G1)
5- 21 A17 --- Name Other names (G2)
23- 24 I2 h RAh Right ascension (J2000) (2)
26- 27 I2 min RAm Right ascension (J2000)
29- 33 F5.2 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign (J2000)
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 42 I2 arcsec DEs Declination (J2000)
44- 54 A11 --- CType Catalog type (3)
56- 59 A4 --- PType Profile type (4)
61- 65 A5 --- Band Bands of the nucleus or anti-nucleus (5)
68- 71 F4.2 --- EllB Ellipticity from B band (error=±0.04)
73- 76 F4.2 --- EllI Ellipticity from I band (error=±0.04)
78- 81 F4.1 mag Bmag B magnitude (error=±0.3)
83- 86 F4.1 mag Imag I magnitude (error=±0.2)
88- 90 I3 % Memb Probability of cluster membership (6)
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Note (2): The positions of galaxies 99, 107 and 110 were supplied by
S. Sabatini (private communication).
Galaxy 27 is very close to VCC 721, and may be part of it. However
for the purposes of the present study it was profiled separately.
Note (3): Catalogue type denotes the classification of the galaxy in its
existing catalogue for known galaxies, and a classification based on
visual inspection of the B band image for new and field galaxies.
Note (4): Profile type denotes the classification based on the intensity
profile, and is based on the probabilities of a galaxy being dE,N,
dE,A, or dE in the B and Ibands (see section 3.5). It does not take
account of irregularities in galaxy morphology, but these are given
under "Catalogue Type".
Note (5): Band denotes the band of the nucleus or anti-nucleus.
+ denotes a nucleus and - an anti-nucleus,
e.g. -B,+I denotes an anti-nucleus in B and a nucleus in I.
Note (6): Prob Cluster is the larger of the two probabilities of cluster
membership for the B and I bands for luminosity function alpha=-1.6.
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Byte-by-byte Description of file: tableb?.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Seq Sequential number (G1)
5- 21 A17 --- Name Other names (G2)
23- 27 I5 ct sigma0 Intensity at the centre of the
underlying galaxy
29 A1 --- lesigma0 Limit flag on e_sigma0 (2)
30- 33 I4 ct e_sigma0 rms uncertainty on sigma0
35- 39 F5.2 arcsec r0 Equivalent radius parameter
41 A1 --- ler0 Limit flag on e_r0 (2)
42- 46 F5.2 arcsec e_r0 rms uncertainty on r0
48- 51 F4.1 --- n Sersic shape parameter
53 A1 --- len Limit flag on e_n (2)
54- 56 F3.1 --- e_n rms uncertainty on n
58- 61 F4.1 mag/arcsec2 mu0 Central surface brightness (3)
63- 65 F3.1 mag/arcsec2 e_mu0 rms uncertainty on mu0
67- 71 I5 ct k Intensity of the point nucleus
73- 78 F6.2 --- k/sigma0 Intensity ratio
(point nucleus/galaxy center)
80- 84 F5.1 --- e_k/sigma0 Uncertainty on k/sigma0
86 I1 --- Fit [1/3] Type of fitting used (4)
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Note (2): For the fainter galaxies, the errors were sometimes >100%,
and these cases are indicated by a '>'.
Some parameters, e.g. r0, must be >0, and for these the '>' applies
only to the upper bound.
Note (3): mu0, the central surface brightness of a galaxy, is calculated by:
mu0=31.35-2.5log10(sigma0) in the B band
mu0=30.33-2.5log10(sigma0) in the I band
Note (4): Fitting number as follows:
1 = 1D Xi2 2 model 2
2 = 2D cross-correlation initial stages
3 = 2D cross-correlation final stage
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Seq Sequential number (G1)
5- 21 A17 --- Name Other names (G2)
23- 27 F5.2 % k/Lg(B) Relative nucleus size in B band
29- 33 F5.2 % e_k/Lg(B) rms uncertainty on k/Lg(B)
36- 40 F5.2 % k/Lg(I) Relative nucleus size in I band
42- 46 F5.2 % e_k/Lg(I) rms uncertainty on k/Lg(I)
48- 50 A3 --- Cg Type of colour gradient (1)
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Note (1): Four different types of colour gradient were possible with
increasing r as follows:
BIB = indicates that B-I increases to a maximum then decreases
IBI = indicates that B-I decreases to a minimum then increases;
BI = indicates that B-I increases monotonically or nearly so,
i.e. there is a minimum near r=0 or a maximum at large r;
IB = indicates that B-I decreases monotonically or nearly so,
i.e. there is a maximum near r=0 or a minimum at large r.
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Note (G1): Galaxies are numbered from 1 to 181 for the members,
and from F1 to F9 the field ones.
Note (G2): Other names are from:
-- VCC : Virgo Cluster Catalogue, Binggeli et al., 1985, J/AJ/90/1681
-- TH : Trentham and Hodgkin, 2002, Cat. J/MNRAS/333/423,
[TH2002] NNN in Simbad
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-May-2006