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The 2dF Galaxy Redshift Survey: the environmental dependence of galaxy star formation rates near clusters

Lewis, Ian and Balogh, Michael and De Propris, Roberto and Couch, Warrick and Bower, Richard and Offer, Allison and Bland-Hawthorn, Joss and Baldry, Ivan K. and Baugh, Carlton and Bridges, Terry and Cannon, Russell and Cole, Shaun and Colless, Matthew and Collins, Chris and Cross, Nicholas and Dalton, Gavin and Driver, Simon P. and Efstathiou, George and Ellis, Richard S. and Frenk, Carlos S. and Glazebrook, Karl and Hawkins, Edward and Jackson, Carole and Lahav, Ofer and Lumsden, Stuart and Maddox, Steve and Madgwick, Darren and Norberg, Peder and Peacock, John A. and Percival, Will and Peterson, Bruce A. and Sutherland, Will and Taylor, Keith (2002) The 2dF Galaxy Redshift Survey: the environmental dependence of galaxy star formation rates near clusters. Monthly Notices of the Royal Astronomical Society, 334 (3). pp. 673-683. ISSN 0035-8711. doi:10.1046/j.1365-8711.2002.05558.x.

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We have measured the equivalent width of the Hα emission line for 11 006 galaxies brighter than M_b-=-−19 (Ω_Λ = 0.7, Ω_m = 0.3, H_0 = 70 km s^(−1) Mpc^(−1)) at 0.05 < z < 0.1 in the 2dF Galaxy Redshift Survey (2dFGRS), in the fields of 17 known galaxy clusters. The limited redshift range ensures that our results are insensitive to aperture bias, and to residuals from night sky emission lines. We use these measurements to trace μ*, the star formation rate normalized to L*, as a function of distance from the cluster centre, and local projected galaxy density. We find that the distribution of μ* steadily skews toward larger values with increasing distance from the cluster centre, converging to the field distribution at distances greater than ∼3 times the virial radius. A correlation between star formation rate and local projected density is also found, which is independent of cluster velocity dispersion and disappears at projected densities below ∼1 galaxy Mpc^(−2) (brighter than M_b = −19). This characteristic scale corresponds approximately to the mean density at the cluster virial radius. The same correlation holds for galaxies more than two virial radii from the cluster centre. We conclude that environmental influences on galaxy properties are not restricted to cluster cores, but are effective in all groups where the density exceeds this critical value. The present-day abundance of such systems, and the strong evolution of this abundance, makes it likely that hierarchical growth of structure plays a significant role in decreasing the global average star formation rate. Finally, the low star formation rates well beyond the virialized cluster rule out severe physical processes, such as ram pressure stripping of disc gas, as being completely responsible for the variations in galaxy properties with environment.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bland-Hawthorn, Joss0000-0001-7516-4016
Baugh, Carlton0000-0002-9935-9755
Colless, Matthew0000-0001-9552-8075
Ellis, Richard S.0000-0001-7782-7071
Norberg, Peder0000-0002-5875-0440
Additional Information:© 2002 RAS. Accepted 2002 March 28. Received 2002 March 28; in original form 2002 February 7. We thank an anonymous referee for useful comments. MLB acknowledges support from a PPARC rolling grant for extragalactic astronomy at Durham. RDP and WJC acknowledge funding from the Australian Research Council. We thank Julio Navarro for providing the numerical simulations, and the Sloan Digital Sky Survey collaboration for sharing their results in advance of publication. We gratefully acknowledge the support of the staff of the Anglo-Australian Observatory for their assistance supporting 2dF throughout the survey, and of the Australian and UK time assignment committees for their continued support for this project.
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Australian Research CouncilUNSPECIFIED
Subject Keywords:galaxies: clusters: general
Issue or Number:3
Record Number:CaltechAUTHORS:20170408-195911451
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Official Citation:Ian Lewis, Michael Balogh, Roberto De Propris, Warrick Couch, Richard Bower, Alison Offer, Joss Bland-Hawthorn, Ivan K. Baldry, Carlton Baugh, Terry Bridges, Russell Cannon, Shaun Cole, Matthew Colless, Chris Collins, Nicholas Cross, Gavin Dalton, Simon P. Driver, George Efstathiou, Richard S. Ellis, Carlos S. Frenk, Karl Glazebrook, Edward Hawkins, Carole Jackson, Ofer Lahav, Stuart Lumsden, Steve Maddox, Darren Madgwick, Peder Norberg, John A. Peacock, Will Percival, Bruce A. Peterson, Will Sutherland, Keith Taylor; The 2dF Galaxy Redshift Survey: the environmental dependence of galaxy star formation rates near clusters, Monthly Notices of the Royal Astronomical Society, Volume 334, Issue 3, 11 August 2002, Pages 673–683,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76375
Deposited By: 1Science Import
Deposited On:30 Mar 2018 21:09
Last Modified:15 Nov 2021 16:59

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