Modelling galaxy clustering: is new physics needed in galaxy formation models?
Abstract
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.
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.Attached Files
Published - Kim2009p6646Mon_Not_R_Astron_Soc.pdf
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Additional details
- Eprint ID
- 17087
- Resolver ID
- CaltechAUTHORS:20100107-100612422
- Korean Government
- Royal Society
- Science and Technology Facilities Council (STFC)
- Created
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2010-01-11Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field