Galaxy Look-back Evolution Models: A Comparison with Magneticum Cosmological Simulations and Observations

被引:9
|
作者
Kudritzki, Rolf-Peter [1 ,2 ]
Teklu, Adelheid F. [1 ,3 ]
Schulze, Felix [1 ,4 ]
Remus, Rhea-Silvia [1 ]
Dolag, Klaus [1 ,5 ]
Burkert, Andreas [1 ,4 ]
Zahid, H. Jabran [6 ]
机构
[1] Univ Sternwarte, LMU Munchen, Scheinerstr 1, D-81679 Munich, Germany
[2] Univ Hawaii Manoa, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
[3] Excellence Cluster Origins, Boltzmannstr 2, D-85748 Garching, Germany
[4] Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany
[5] Max Planck Inst Astrophys, Karl Schwarzschildstr 1, D-85748 Garching, Germany
[6] Microsoft Res, 14820 NE 36th St, Redmond, WA 98052 USA
来源
ASTROPHYSICAL JOURNAL | 2021年 / 910卷 / 02期
关键词
D galaxies; Galaxy evolution; Metallicity; Star formation; Galaxy accretion; STAR-FORMING GALAXIES; MASS-METALLICITY RELATION; CHEMICAL EVOLUTION; MOLECULAR GAS; SCALING RELATIONS; STELLAR MASS; ANALYTIC SOLUTIONS; DENSITY RELATION; DEPLETION TIME; MAIN-SEQUENCE;
D O I
10.3847/1538-4357/abe40c
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We construct empirical models of star-forming galaxy evolution assuming that individual galaxies evolve along well-known scaling relations between stellar mass, gas mass, and star formation rate following a simple description of chemical evolution. We test these models by a comparison with observations and detailed Magneticum high-resolution hydrodynamic cosmological simulations. Galaxy star formation rates, stellar masses, gas masses, ages, interstellar medium, and stellar metallicities are compared. It is found that these simple look-back models capture many of the crucial aspects of galaxy evolution reasonably well. Their key assumption of a redshift-dependent power-law relationship between galaxy interstellar medium gas mass and stellar mass is in agreement with the outcome of the complex Magneticum simulations. Star formation rates decline toward lower redshift not because galaxies are running out of gas, but because the fraction of the cold interstellar medium gas, which is capable of producing stars, becomes significantly smaller. Gas accretion rates in both model approaches are of the same order of magnitude. Metallicity in the Magneticum simulations increases with the ratio of stellar mass to gas mass as predicted by the look-back models. The mass-metallicity relationships agree, and the star formation rate dependence of these relationships is also reproduced. We conclude that these simple models provide a powerful tool for constraining and interpreting more complex models based on cosmological simulations and for population synthesis studies analyzing the integrated spectra of stellar populations.
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页数:17
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