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Galaxy formation using halo merger histories taken from N-body simulations

Helly, John C. and Cole, Shaun and Frenk, Carlos S. and Baugh, Carlton M. and Benson, Andrew and Lacey, Cedric (2003) Galaxy formation using halo merger histories taken from N-body simulations. Monthly Notices of the Royal Astronomical Society, 338 (4). pp. 903-912. ISSN 0035-8711. doi:10.1046/j.1365-8711.2003.06151.x.

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We develop a hybrid galaxy formation model that uses outputs from an N-body simulation to follow the merger histories (or ‘merger trees’) of dark matter haloes and treats baryonic processes, such as the cooling of gas within haloes and subsequent star formation, using the semi-analytic model of Cole et al. We compare this hybrid model with an otherwise identical model that utilizes merger-tree realizations generated using a Monte Carlo algorithm and find that, apart from the limited mass resolution imposed by the N-body particle mass, the only significant differences between the models are caused by the known discrepancy between the distribution of halo progenitor masses predicted by the extended Press—Schechter theory and that found in N-body simulations. We investigate the effect of limited mass resolution on the hybrid model by comparing with a purely semi-analytic model that has greatly improved mass resolution. We find that the mass resolution of the simulation we use, which has a particle mass of 1.4 × 10^(10) h^(−1) M_⊙, is insufficient to produce a reasonable luminosity function for galaxies with magnitudes in the b_J band fainter than −17.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Helly, John C.0000-0002-0647-4755
Frenk, Carlos S.0000-0002-2338-716X
Baugh, Carlton M.0000-0002-9935-9755
Benson, Andrew0000-0001-5501-6008
Lacey, Cedric0000-0001-9016-5332
Additional Information:© 2003 RAS. Accepted 2002 October 2. Received 2002 October 2; in original form 2002 February 26. We acknowledge support from PPARC and the Royal Society.
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Subject Keywords:methods: numerical – galaxies: formation
Issue or Number:4
Record Number:CaltechAUTHORS:20170408-201457900
Persistent URL:
Official Citation:John C. Helly, Shaun Cole, Carlos S. Frenk, Carlton M. Baugh, Andrew Benson, Cedric Lacey; Galaxy formation using halo merger histories taken from N-body simulations, Monthly Notices of the Royal Astronomical Society, Volume 338, Issue 4, 1 February 2003, Pages 903–912,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76381
Deposited By: 1Science Import
Deposited On:30 Mar 2018 22:07
Last Modified:15 Nov 2021 16:59

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