J/MNRAS/398/1129 Central galaxies in groups and clusters (Guo+, 2009)
Structural properties of central galaxies in groups and clusters.
Guo Y., McIntosh D.H., Mo H.J., Katz N., van den Bosch F.C., Weinberg M.,
Weinmann S.M., Pasquali A., Yang X.
<Mon. Not. R. Astron. Soc., 398, 1129-1149 (2009)>
=2009MNRAS.398.1129G 2009MNRAS.398.1129G
ADC_Keywords: Clusters, galaxy ; Morphology ; Magnitudes
Keywords: galaxies: clusters: general - galaxies: evolution -
galaxies: formation - galaxies: fundamental parameters -
galaxies: structure
Abstract:
Using a statistically representative sample of 911 central galaxies
(CENs) from the Sloan Digital Sky Survey (SDSS) Data Release 4 group
catalogue, we study how the structure (shape and size) of the first
rank (by stellar mass) group and cluster members depends on (1) galaxy
stellar mass (Mstar), (2) the global environment defined by the dark
matter halo mass (Mhalo) of the host group and (3) the local
environment defined by their special halocentric position. We quantify
the structure of SDSS galaxies with a galfit-based pipeline that fits
two-dimensional Sersic models to the r-band image data. Through tests
with simulated and real galaxy images, we demonstrate that our
pipeline can recover Sersic parameters without significant bias.
Moreover, to test the impact of local environment on CENs, we compare
the structure of CENs with that satellite galaxies (SATs) of
comparable Mstar.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 151 879 Parameters of galaxies in the CEN sample
tableb2.dat 151 704 Parameters of galaxies in the SAT sample S1
tableb3.dat 151 696 Parameters of galaxies in the SAT sample S2
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See also:
II/267 : The SDSS Photometric Catalog, Release 4 (Adelman-McCarthy+, 2006)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: tableb?.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- Gal Galaxy ID number (1)
9- 17 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
19- 27 F9.5 deg DEdeg Declination in decimal degrees (J2000)
29- 36 F8.5 mag mag Apparent total magnitude
38- 47 F10.5 pix a50 Semimajor axis
49- 56 F8.5 --- n Sersic index
58- 64 F7.5 --- b/a Axis ratio
66- 74 F9.5 deg PA [-180/180] Position angle
76- 84 F9.5 --- Sky SDSS global sky background (in unit of ADU)
used in image fitting
86- 93 F8.5 --- chi2v Reduced chi2 of the best-fitting model
95-101 F7.5 --- z Redshift
103-111 F9.5 mag MAG Absolute magnitude (2)
113-120 F8.5 [solMass] Mstar Stellar mass (in h-2*solMass unit)
122-130 F9.5 kpc rhl Half-light radius (in h-1*kpc unit)
132-139 F8.5 mag g-r g−r colour index corrected to z=0.1
141-148 F8.5 [solMass] Mhalo Host halo mass of the galaxy in
(h-2*solMass unit)
150-151 I2 --- TT [-1/1] Visual type of galaxy:
0=late-type, 1=early-type, -1=peculiar
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Note (1): Galaxy ID number, which is the order of a galaxy in the NYU-VAGC
catalogue, http://sdss.physics.nyu.edu/vagc
Note (2): which is derived based on the best-fitting apparent total magnitude,
K-corrected to z=0.1, and corrected for the Milky Way extinction.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Feb-2010