Observational Search for Population III Stars in High-Redshift Galaxies

被引:0
作者
Nagao, Tohru [1 ]
机构
[1] Ehime Univ, Res Ctr Space & Cosm Evolut, Matsuyama, Ehime 7908577, Japan
来源
LOW-METALLICITY STAR FORMATION: FROM THE FIRST STARS TO DWARF GALAXIES | 2008年 / 255期
关键词
early universe; galaxies: evolution; galaxies: formation; stars: early-type;
D O I
10.1017/S1743921308024617
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this contribution we present our new photometric search for high-z galaxies hosting Population III (PoPIII) stars based on deep intermediate-band imaging observations, by using Supreme-Cam oil the Subaru Telescope. By combining our new data with the existing broad-band and narrow-band data in the target field, we searched for galaxies which emit strongly both in Ly alpha and in HeII lambda 1640 ("dual emitters") that; are for PopIII-hosting galaxies, at 4 less than or similar to z less than or similar to 5. Although we found 10 "dual emitters", most of them turn out to be [OII]-[OIII] dual emitters or H beta-H alpha dual emitters all z < 1, as inferred from their broad-band colors and front the ratio of the equivalent widths. No convincing candidate of Ly alpha-HeII dual emitter with SFRPopIII greater than or similar to 2M(circle dot) yr(-1) was found. This result, disfavors low feedback models for PopIII star clusters. and implies an upper limit of the PopIII SFR density of SFRDPopIII < 5 x 10(-6) M-circle dot yr(-1) Mpc(-3). This new selection method to search for PopIII-hosting galaxies should be useful in future surveys for the first observational detection of PopIII-hosting galaxies at, high redshift.
引用
收藏
页码:79 / 83
页数:5
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