A unified multiwavelength model of galaxy formation

被引:338
作者
Lacey, Cedric G. [1 ]
Baugh, Carlton M. [1 ]
Frenk, Carlos S. [1 ]
Benson, Andrew J. [2 ]
Bower, Richard G. [1 ]
Cole, Shaun [1 ]
Gonzalez-Perez, Violeta [1 ,3 ]
Helly, John C. [1 ]
Lagos, Claudia D. P. [4 ,5 ]
Mitchell, Peter D. [1 ,6 ]
机构
[1] Univ Durham, Inst Computat Cosmol, Dept Phys, South Rd, Durham DH1 3LE, England
[2] Carnegie Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA
[3] Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg,Burnaby Rd, Portsmouth PO1 3FX, Hants, England
[4] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
[5] Int Ctr Radio Astron Res, 7 Fairway, Perth, WA 6009, Australia
[6] Observ Lyon, Ctr Rech Astrophys Lyon, 9 Ave Charles Andre, F-69230 St Genis Laval, France
基金
英国科学技术设施理事会; 欧洲研究理事会;
关键词
galaxies: evolution; galaxies: formation; galaxies: high-redshift; INITIAL MASS FUNCTION; DARK-MATTER HALOES; STELLAR POPULATION SYNTHESIS; MOLECULAR GAS CONTENTS; STAR-FORMATION HISTORY; GIANT BRANCH STARS; ULTRAVIOLET LUMINOSITY FUNCTION; SPECTRAL ENERGY-DISTRIBUTIONS; FAINT SUBMILLIMETER GALAXIES; LYMAN-BREAK GALAXIES;
D O I
10.1093/mnras/stw1888
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new version of the GALFORM semi-analytical model of galaxy formation. This brings together several previous developments of GALFORM into a single unified model, including a different initial mass function (IMF) in quiescent star formation and in starbursts, feedback from active galactic nuclei suppressing gas cooling in massive haloes, and a new empirical star formation law in galaxy discs based on their molecular gas content. In addition, we have updated the cosmology, introduced a more accurate treatment of dynamical friction acting on satellite galaxies, and updated the stellar population model. The new model is able to simultaneously explain both the observed evolution of the K-band luminosity function and stellar mass function, and the number counts and redshift distribution of sub-mm galaxies selected at 850 mu m. This was not previously achieved by a single physical model within the Lambda cold dark matter framework, but requires having an IMF in starbursts that is somewhat top-heavy. The new model is tested against a wide variety of observational data covering wavelengths from the far-UV to sub-mm, and redshifts from z = 0 to 6, and is found to be generally successful. These observations include the optical and near-infrared (IR) luminosity functions, HI mass function, fraction of early type galaxies, Tully-Fisher, metallicity-luminosity and size-luminosity relations at z = 0, as well as far-IR number counts, and far-UV luminosity functions at z similar to 3-6. Discrepancies are, however, found in galaxy sizes and metallicities at low luminosities, and in the abundance of low-mass galaxies at high-z, suggesting the need for a more sophisticated model of supernova feedback.
引用
收藏
页码:3854 / 3911
页数:58
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