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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
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.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Feb-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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