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The Gemini Deep Deep Survey. VII. The redshift evolution of the mass-metallicity relation
被引:435
作者:
Savaglio, S
[1
]
Glazebrook, K
Le Borgne, D
Juneau, S
Abraham, RG
Chen, HW
Crampton, D
McCarthy, PJ
Carlberg, RG
Marzke, RO
Roth, K
Jorgensen, I
Murowinski, R
机构:
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[2] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H8, Canada
[3] Univ Montreal, Dept Phys, Montreal, PQ H3T 1J4, Canada
[4] Herzberg Inst Astrophys, NRC, Victoria, BC, Canada
[5] MIT, Ctr Space Res, Cambridge, MA 02139 USA
[6] Carnegie Inst Washington Observ, Pasadena, CA 91101 USA
[7] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA
[8] Gemini Observ, Hilo, HI 96720 USA
关键词:
cosmology : observations;
galaxies : abundances;
galaxies : evolution;
galaxies : fundamental parameters;
galaxies : ISM;
HII regions;
D O I:
10.1086/497331
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We have investigated the mass-metallicity (M-Z) relation using galaxies at 0: 4 < z < 1.0 from the Gemini Deep Deep Survey (GDDS) and Canada-France Redshift Survey (CFRS). Deep K- and z'-band photometry allowed us to measure stellar masses for 69 galaxies. From a subsample of 56 galaxies, for which metallicity of the interstellar medium is also measured, we identified a strong correlation between mass and metallicity for the first time in the distant universe. This was possible because of the larger baseline spanned by the sample in terms of metallicity ( a factor of 7) and mass ( a factor of 400) than in previous works. This correlation is much stronger and tighter than the luminosity-metallicity relation, confirming that stellar mass is a more meaningful physical parameter than luminosity. We find clear evidence for temporal evolution in the M-Z relation in the sense that at a given mass, a galaxy at z similar to 0.7 tends to have lower metallicity than a local galaxy of similar mass. We use the z similar to 0.1 Sloan Digital Sky Survey M-Z relation and a small sample of z similar to 2.3 Lyman break galaxies with known mass and metallicity to propose an empirical redshift-dependent M-Z relation. According to this relation the stellar mass and metallicity in small galaxies evolve for a longer time than they do in massive galaxies. This relation predicts that the generally metal-poor damped Ly alpha galaxies have stellar masses of the order of 10(8.8) M-circle dot ( with a dispersion of 0.7 dex) all the way from z similar to 0.2 to 4. The observed redshift evolution of the M-Z relation can be reproduced remarkably well by a simple closed-box model in which the key assumption is an e-folding time for star formation that is higher or, in other words, a period of star formation that lasts longer in less massive galaxies than in more massive galaxies. Such a picture supports the downsizing scenario for galaxy formation.
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页码:260 / 279
页数:20
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