J/MNRAS/404/1490 Shapes of BCGs in nearby clusters shapes (Fasano+, 2010)
The shapes of BCGs and normal ellipticals in nearby clusters.
Fasano G., Bettoni D., Ascaso B., Tormen G., Poggianti B.M.,
Valentinuzzi T., D'Onofrio M., Fritz J., Moretti A., Omizzolo A., Cava A.,
Moles M., Dressler A., Couch W.J., Kjaergaard P., Varela J.
<Mon. Not. R. Astron. Soc., 404, 1490-1504 (2010)>
=2010MNRAS.404.1490F 2010MNRAS.404.1490F
ADC_Keywords: Clusters, galaxy ; Galaxies, nearby ; Morphology
Keywords: galaxies: clusters: general -
galaxies: elliptical and lenticular, cD - galaxies: general
Abstract:
We compare the apparent axial ratio distributions of the brightest
cluster galaxies (BCGs) and normal ellipticals (Es) in our sample of
75 galaxy clusters from the WIde-field Nearby Galaxy-cluster Survey
(WINGS). Most BCGs in our clusters (69 per cent) are classified as cD
galaxies. The sample of cDs has been completed by 14 additional cDs
(non-BCGs) we found in our clusters. We deproject the apparent axial
ratio distributions of Es, BCGs and cDs using a bivariate version of
the Lucy rectification algorithm, whose results are supported by an
independent Monte Carlo technique. Finally, we compare the intrinsic
shape distribution of BCGs to the corresponding shape distribution of
the central part of cluster-sized dark matter haloes extracted from
the GIF2 Lambda cold dark matter ({LAMBDA}CDM) N-body simulations (Gao
et al., 2004MNRAS.355..819G 2004MNRAS.355..819G).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 75 Main properties of the BCG sample and of the
host clusters
table2.dat 95 14 Main properties of the additional cD sample
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See also:
VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)
J/MNRAS/281/799 : XBACs, the sample (Ebeling+, 1996)
J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998)
J/MNRAS/318/333 : Extended ROSAT Bright Cluster Sample (Ebeling+ 2000)
J/A+A/495/707 : WINGS spectroscopy of 48 galaxy clusters (Cava+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
10- 13 F4.2 [10+37W] log(LX) Decimal logarithm of the X-ray luminosity in
the 0.1-2.4keV band (1)
15- 19 F5.3 [km/s] log(sig) ? Decimal logarithm of the velocity
dispersion of cluster galaxies (2)
21- 26 F6.4 --- z Average redshifts of clusters (2)
28- 32 A5 --- --- [WINGS]
33- 51 A19 --- WINGS WINGS name (JHHMMSS.ss+DDMMSS.s) (G3)
53- 54 A2 --- MT Morphological Type
56- 61 F6.2 mag VMAG Total absolute magnitude in the V band (G4)
63- 68 F6.2 mag KMAG ? 2MASS Ks band total absolute magnitude
70- 74 F5.2 kpc Re ? Effective radius from GASPHOT (G5)
76- 78 F3.1 --- n ? Sersic index from GASPHOT (G5)
80- 84 F5.3 --- qG Axial ratio at the effective isophote
from GASPHOT (6)
86- 90 F5.3 --- q15 ? Axial ratios of the isophotes at 15kpc of
major axis from GASPHOT
92- 96 F5.3 --- q30 ? Axial ratios of the isophotes at 30kpc of
major axis from GASPHOT
98-102 F5.3 --- q60 ? Axial ratios of the isophotes at 30kpc of
major axis from GASPHOT
104-108 F5.3 --- qS ? Axial ratio at the threshold area from
Varela et al. (2009, J/A+A/497/667
sextractor)
110-114 F5.3 --- qL ? Axial ratio from the LEDA Hypercat data
base (Paturel et al., 2003, Cat. VII/237)
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Note (1): from Ebeling et al. (1996, Cat. J/MNRAS/281/799, 1998, Cat.
J/MNRAS/301/881, 2000, Cat. J/MNRAS/318/333).
Note (2): from Cava et al. (2009, Cat. J/A+A/495/707). Some values have
been updated, according to Cava et al. (in preparation).
Note (6): In case GASPHOT failed to converge, we derive inline image from
the equation inline image (obtained from the linear best fit of the
relation in panel 15 of Fig. 1.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
10- 14 A5 --- --- [WINGS]
15- 33 A19 --- WINGS WINGS name (JHHMMSS.ss+DDMMSS.s) (G3)
35 I1 --- Rank [2/3] Luminosity ranking in the V band
37- 42 F6.2 mag VMAG Total absolute magnitude in the V band (G4)
44- 49 F6.2 mag KsMAG ? 2MASS K band total absolute magnitude
51- 55 F5.2 kpc Re ? Effective radius from GASPHOT (G5)
57- 59 F3.1 --- n ? Sersic index from GASPHOT (G5)
61- 65 F5.3 --- qG Axial ratio at the effective isophote
from GASPHOT
67- 71 F5.3 --- q15 Axial ratios of the isophotes at 15kpc of
major axis from GASPHOT
73- 77 F5.3 --- q30 Axial ratios of the isophotes at 30kpc of
major axis from GASPHOT
79- 83 F5.3 --- q60 ? Axial ratios of the isophotes at 30kpc of
major axis from GASPHOT
85- 89 F5.3 --- qS Axial ratio at the threshold area from
Varela et al. (2009, J/A+A/497/667 sextractor)
91- 95 F5.3 --- qL Axial ratio from the LEDA Hypercat data
base (Paturel et al., 2003, Cat. VII/237).
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Global notes:
Note (G3): WINGS identifier from Varela et al. (2009, Cat. J/A+A/497/667).
Note (G4): from Varela et al. (2009, Cat. J/A+A/497/667, corrected for
galactic extinction)
Note (G5): Missing values indicate that GASPHOT failed to converge.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Nov-2010