Lyalpha-HeII双发射体的测光巡天：在高红移星系中寻找星族III星
A photometric survey for Lyalpha-HeII dual emitters: Searching for Population III stars in high-redshift galaxies
摘要：
我们提出了一个新的光度搜索的高z星系托管人口III（PopIII）恒星的基础上深中间波段成像观测在斯巴鲁深场（SDF），通过使用Suprime-Cam的斯巴鲁望远镜。通过将我们的新数据与现有的宽带和窄带数据相结合，我们搜索了在Ly_alpha和HeII 1640中都强烈发射的星系（“双发射体”），这些星系是PopIII托管星系的有希望的候选者，在3.93<z<4.01和4.57<z<4.65。虽然我们发现了10个"双发射体“，但根据它们的宽带颜色和等效宽度比，大多数都是z<1时的[OII]-[OIII]双发射体或H_β-（H_alpha+[NII]）双发射体。通过我们在SDF中4.03 x 10^5 Mpc ^3的光度搜索，没有发现SFR_PopIII > 2 Msun/yr的Ly_alpha-HeII双发射体的令人信服的候选者。这一结果不利于PopIII星团的低反馈模型，并意味着PopIII SFR密度的上限为SFRD_PopIII < 5 x 10^-6 Msun/yr/Mpc^3。这种新的选择方法来寻找PopIII托管星系应该是有用的，在未来的窄带调查，以实现第一次观测检测PopIII托管星系在高红移。
英文摘要：
We present a new photometric search for high-z galaxies hosting Population III (PopIII) stars based on deep intermediate-band imaging observations obtained in the Subaru Deep Field (SDF), by using Suprime-Cam on the Subaru Telescope. By combining our new data with the existing broad-band and narrow-band data, we searched for galaxies which emit strongly both in Ly_alpha and in HeII 1640 (``dual emitters'') that are promising candidates for PopIII-hosting galaxies, at 3.93<z<4.01 and 4.57<z<4.65. Although we found 10 ``dual emitters'', most of them turn out to be [OII]-[OIII] dual emitters or H_beta-(H_alpha+[NII]) dual emitters at z<1, as inferred from their broad-band colors and from the ratio of the equivalent widths. No convincing candidate of Ly_alpha-HeII dual emitter of SFR_PopIII > 2 Msun/yr was found by our photometric search in 4.03 x 10^5 Mpc^3 in the SDF. This result disfavors low feedback models for PopIII star clusters, and implies an upper-limit of the PopIII SFR density of SFRD_PopIII < 5 x 10^-6 Msun/yr/Mpc^3. This new selection method to search for PopIII-hosting galaxies should be useful in future narrow-band surveys to achieve the first observational detection of PopIII-hosting galaxies at high redshifts.
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