The 2dF Galaxy Redshift Survey: luminosity functions by density environment and galaxy type

被引:223
作者
Croton, DJ [1 ]
Farrar, GR
Norberg, P
Colless, M
Peacock, JA
Baldry, IK
Baugh, CM
Bland-Hawthorn, J
Bridges, T
Cannon, R
Cole, S
Collins, C
Couch, W
Dalton, G
De Propris, R
Driver, SP
Efstathiou, G
Ellis, RS
Frenk, CS
Glazebrook, K
Jackson, C
Lahav, O
Lewis, I
Lumsden, S
Maddox, S
Madgwick, D
Peterson, BA
Sutherland, W
Taylor, K
机构
[1] Max Planck Inst Astrophys, D-85740 Garching, Germany
[2] NYU, Dept Phys, Ctr Cosmol & Particle Phys, New York, NY 10003 USA
[3] ETH Honggerberg, ETHZ Inst Astron, CH-8093 Zurich, Switzerland
[4] Anglo Australian Observ, Epping, NSW 2111, Australia
[5] Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland
[6] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21118 USA
[7] Univ Durham, Dept Phys, Durham DH1 3LE, England
[8] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada
[9] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead L14 1LD, Merseyside, England
[10] Univ New S Wales, Dept Astrophys, Sydney, NSW 2052, Australia
[11] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
[12] Rutherford Appleton Lab, Space Sci & Technol Div, Didcot OX11 0QX, Oxon, England
[13] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
[14] Univ Bristol, Dept Phys, Astrophys Grp, Bristol BS8 1TL, Avon, England
[15] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[16] CALTECH, Dept Astron, Pasadena, CA 91025 USA
[17] CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
[18] UCL, Dept Phys & Astron, London WC1E 6BT, England
[19] Univ Leeds, Dept Phys, Leeds LS2 9JT, W Yorkshire, England
[20] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England
[21] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
关键词
galaxies : luminosity function; mass function; galaxies : statistics; large-scale structure of Universe;
D O I
10.1111/j.1365-2966.2004.08546.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We use the 2dF Galaxy Redshift Survey to measure the dependence of the b(J)-band galaxy luminosity function on large-scale environment, defined by density contrast in spheres of radius 8 h(-1) Mpc, and on spectral type, determined from principal component analysis. We find that the galaxy populations at both extremes of density differ significantly from that at the mean density. The population in voids is dominated by late types and shows, relative to the mean, a deficit of galaxies that becomes increasingly pronounced at magnitudes brighter than M-bJ - 5 log(10) h less than or similar to -18 5. In contrast, cluster regions have a relative excess of very bright early-type galaxies with M-bJ -5 log(10) h less than or similar to -21. Differences in the mid- to faint-end population between environments are significant: at M-bJ -5 log(10) h = -18 early- and late-type cluster galaxies show comparable abundances, whereas in voids the late types dominate by almost an order of magnitude. We find that the luminosity functions measured in all density environments, from voids to clusters, can be approximated by Schechter functions with parameters that vary smoothly with local density, but in a fashion that differs strikingly for early- and late-type galaxies. These observed variations, combined with our finding that the faint-end slope of the overall luminosity function depends at most weakly on density environment, may prove to be a significant challenge for models of galaxy formation.
引用
收藏
页码:1155 / 1167
页数:13
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