Optical-IR spectral energy distribution of the protogalaxy candidate MS 1512-cB58

被引:48
作者
Ellingson, E
Yee, HKC
Bechtold, J
Elston, R
机构
[1] UNIV TORONTO, DEPT ASTRON, TORONTO, ON M5S 3H8, CANADA
[2] CANADA FRANCE HAWAII TELESCOPE CORP, KAMUELA, HI 96743 USA
[3] UNIV ARIZONA, STEWARD OBSERV, TUCSON, AZ 85721 USA
[4] NATL OPT ASTRON OBSERV, CERRO TOLOLO INTER AMER OBSERV, LA SERENA 1353, CHILE
基金
加拿大自然科学与工程研究理事会; 美国国家航空航天局;
关键词
galaxies; formation; photometry; starburst;
D O I
10.1086/310182
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The spectral energy distribution of the protogalaxy candidate MS 1512-cB58 at z = 2.72 is presented. Photometry in seven bands ranging from g to K' (1300-6000 Angstrom rest wavelength) are fitted with population synthesis models. The data confirm a very young age for this galaxy in agreement with ages estimated from preliminary C IV lambda 1550 P Cygni profile modeling. Single-burst models with ages greater than about 20 Myr can be discarded at the 99% confidence level, and continuous star formation models with ages greater than about 35 Myr can be discarded at the 95% confidence level. The spectral energy distribution is most consistent with a continuous star formation model of about 10-20 Myr, with reddening of E(B - V) similar to 0.3, No evidence for an older population of stars is seen, but the possibility of an older population with as much as 90% of the galaxy mass cannot be ruled out. We discuss the possible ramifications of a nonstandard IMF and gravitational lensing on the galaxy's age and mass.
引用
收藏
页码:L71 / L74
页数:4
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