Xin-Fa Deng et al. 2009 ApJ 699 948 doi:10.1088/0004-637X/699/2/948
Xin-Fa Deng, Ji-Zhou He, Ping Wu and Ying-Ping Ding
Show affiliationsFrom the Main galaxy sample of the Sloan Digital Sky Survey Data Release 6, we construct two volume-limited samples with the luminosity –20.0 ≤ Mr ≤ –18.5 and –22.40 ≤ Mr ≤ –20.16, respectively, to explore the environmental dependence of the fraction of ''unconventional'' galaxies: red late types and blue early types. We use the density estimator within the distance to the fifth nearest neighbor, and construct two samples at both extremes of density and perform comparative studies between them for each volume-limited sample. Results of two volume-limited samples show the same conclusions: the fraction of red late-type galaxies rises considerably with increasing local density, and that one of the blue early-type galaxies declines substantially with increasing local density. In addition, we note that bluer galaxies preferentially are late types, but the red galaxies are not dominated by early types.
Issue 2 (2009 July 10)
Received 2008 October 26, accepted for publication 2009 April 30
Published 2009 June 17
Xin-Fa Deng et al. 2009 ApJ 699 948
J E Burns 2006 Phys. Med. Biol. 51 R1
Stephen Fairhurst et al 2005 Class. Quantum Grav. 22 S1109
Toshikazu Shigeyama and Takuji Tsujimoto 2003 ApJ 598 L47
Tobias Galla 2006 J. Phys. A: Math. Gen. 39 3853
Wako Aoki et al 2000 ApJ 536 L97
John N. Bahcall and Aldo M. Serenelli 2005 ApJ 626 530
Michael Bradley et al 2000 Class. Quantum Grav. 17 2635
Luming Shen and Zhen Chen 2004 Modelling Simul. Mater. Sci. Eng. 12 S347
P Derollez et al 1999 J. Phys.: Condens. Matter 11 3987