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arXiv · 0802.4123

A photometric survey for Lyalpha-HeII dual emitters: Searching for Population III stars in high-redshift galaxies

Tohru Nagao·Shunji Sasaki·Roberto Maiolino·Celestine Grady·Nobunari Kashikawa·Chun Ly·Matthew Malkan·Kentaro Motohara·Takashi Murayama·Daniel Schaerer·Yasuhiro Shioya·Yoshiaki Taniguchi
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Abstract

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 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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Tohru Nagao, Shunji Sasaki, Roberto Maiolino, Celestine Grady, Nobunari Kashikawa, Chun Ly, Matthew Malkan, Kentaro Motohara, Takashi Murayama, Daniel Schaerer, Yasuhiro Shioya, Yoshiaki Taniguchi. 2008-02-28. A photometric survey for Lyalpha-HeII dual emitters: Searching for Population III stars in high-redshift galaxies. https://doi.org/10.1086/587888

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