A Caltech Library Service

Galactosynthesis: halo histories, star formation and discs

Buchalter, Ari and Jimenez, Raul and Kamionkowski, Marc (2001) Galactosynthesis: halo histories, star formation and discs. Monthly Notices of the Royal Astronomical Society, 322 (1). pp. 43-66. ISSN 0035-8711. doi:10.1046/j.1365-8711.2001.04031.x.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We investigate the effects of a variety of ingredients that must enter into a realistic model for disc galaxy formation, focusing primarily on the Tully–Fisher (TF) relation and its scatter in several wavebands. In particular, we employ analytic distributions for halo formation redshifts and halo spins, empirical star formation rates and initial mass functions, realistic stellar populations, and chemical evolution of the gas. Our main findings are as follows. (a) The slope, normalization and scatter of the TF relation across various wavebands are determined largely by the parent halo properties as dictated by the initial conditions, but are also influenced by star formation in the disc. (b) TF scatter in this model is due primarily to the spread in formation redshifts. The scatter can be measurably reduced by chemical evolution, and also by the weak anticorrelation between peak height and spin. (c) Multiwavelength constraints can be important in distinguishing between models that appear to fit the TF relation in I or K. (d) Assuming passive disc evolution, successful models seem to require that the bulk of disc formation cannot occur too early (z>2–3) or too late (z<0.2), and are inconsistent with high values of Ω₀. (e) A simple, realistic model with the above ingredients, and fewer free parameters than typical semi-analytic models, can reasonably reproduce the observed z=0 TF relation in all bands (B, R, I and K), as well as the observed B-band surface brightness–magnitude relation. In such a model, the near-infrared TF relation at z=1 is similar to that at z=0, while bluer bands show a markedly steeper TF slope at high redshift, consistent with limited current data. The remarkable agreement with observations suggests that the amount of gas that is expelled or poured into a disc galaxy may be small (though small fluctuations might serve to align B-band predictions better with observations), and that the specific angular momentum of the baryons should roughly equal that of the halo; there is little room for angular momentum transfer. In Appendix A we present analytic fits to stellar population synthesis models.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kamionkowski, Marc0000-0001-7018-2055
Additional Information:© 2001 RAS. Received: 25 August 2000. Accepted: 15 September 2000. Published: 21 March 2001. We wish to acknowledge the collaboration of A. F. Heavens, whose numerous contributions have greatly enhanced this work. We are indebted to L. Wang for helpful discussions and for providing numerical results pertinent to our cosmological models. We also thank the anonymous referee for valuable and insightful feedback. This work was supported by grants NSF-AST-0096023, NSF-AST-9900866, NSF-AST-9618537, NASA NAG5-8506 and DoE DE-FG03-92-ER40701 and by a PPARC Advanced Fellowship.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-92-ER40701
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Subject Keywords:galaxies: formation, galaxies: kinematics and dynamics, galaxies: spiral, cosmology: theory
Issue or Number:1
Record Number:CaltechAUTHORS:20200602-124838359
Persistent URL:
Official Citation:Ari Buchalter, Raul Jimenez, Marc Kamionkowski, Galactosynthesis: halo histories, star formation and discs, Monthly Notices of the Royal Astronomical Society, Volume 322, Issue 1, March 2001, Pages 43–66,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103639
Deposited By: Rebecca Minjarez
Deposited On:03 Jun 2020 19:55
Last Modified:16 Nov 2021 18:23

Repository Staff Only: item control page