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Modelling galaxy clustering: is new physics needed in galaxy formation models?

Kim, Han-Seek and Baugh, C. M. and Cole, S. and Frenk, C. S. and Benson, A. J. (2009) Modelling galaxy clustering: is new physics needed in galaxy formation models? Monthly Notices of the Royal Astronomical Society, 400 (3). pp. 1527-1540. ISSN 0035-8711. doi:10.1111/j.1365-2966.2009.15560.x.

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The clustering amplitude of galaxies depends on their intrinsic luminosity. We compare the properties of publicly available galaxy formation models with clustering measurements from the Two-degree Field Galaxy Redshift Survey. The model predictions show the same qualitative behaviour as the data but fail to match the observations at the level of accuracy at which current measurements can be made. We demonstrate that this is due to the model producing too many satellite galaxies in massive haloes. We implement simple models to describe two new processes: satellite–satellite mergers and the tidal dissolution of satellites to investigate their impact on the predicted clustering. We find that both processes need to be included in order to produce a model which matches the observations.

Item Type:Article
Related URLs:
URLURL TypeDescription
Baugh, C. M.0000-0002-9935-9755
Benson, A. J.0000-0001-5501-6008
Additional Information:© 2009 The Authors. Journal compilation © 2009 RAS. Accepted 2009 August 16. Received 2009 July 27; in original form 2009 May 28. H-SK acknowledges support from the Korean Government's Overseas Scholarship. CSF acknowledges a Royal Society Wolfson Research Merit Award. This work was supported in part by a grant from the Science and Technology Facilities Council. We acknowledge helpful conversations with Peder Norberg, Enrique Gaztañaga and Darren Croton; we also thank Peder Norberg for supplying data in an electronic form in advance of publication.
Funding AgencyGrant Number
Korean GovernmentUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:galaxies: formation; galaxies: interactions; large-scale structure of Universe
Issue or Number:3
Record Number:CaltechAUTHORS:20100107-100612422
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Official Citation:Han-Seek Kim, C. M. Baugh, S. Cole, C. S. Frenk, and A. J. Benson Modelling galaxy clustering: is new physics needed in galaxy formation models? MNRAS (2009) Vol. 400 1527-1540 doi:10.1111/j.1365-2966.2009.15560.x First published online December 11, 2009
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17087
Deposited By: Tony Diaz
Deposited On:11 Jan 2010 22:56
Last Modified:08 Nov 2021 23:32

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