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Observational Search for Population III Stars in High-Redshift Galaxies

Published online by Cambridge University Press:  01 June 2008

Tohru Nagao
Tohru Nagao*
Affiliation:
Research Center for Space and Cosmic Evolution, Ehime University2-5 Bunkyo-cho, Matsuyama 790-8577, Japan email: [email protected]
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Abstract

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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 on 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 Lyα and in Heiiλ1640 (“dual emitters”) that are promising candidates for PopIII-hosting galaxies, at 4 ≲ z ≲ 5. Although we found 10 “dual emitters”, most of them turn out to be [Oii]-[Oiii] dual emitters or Hβ-Hα dual emitters at z < 1, as inferred from their broad-band colors and from the ratio of the equivalent widths. No convincing candidate of Lyα-Heii dual emitter with SFRPopIII ≳ 2M⊙ 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 × 10−6M⊙ 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.

Keywords

early universegalaxies: evolutiongalaxies: formationstars: early-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies , June 2008 , pp. 79 - 83
Copyright
Copyright © International Astronomical Union 2008

References

Dawson, S., Rhoads, J. E., Malhotra, S., et al. 2004, ApJ, 617, 707CrossRefGoogle Scholar
Dijkstra, M., & Wyithe, J. S. B. 2007, MNRAS, 379, 1589CrossRefGoogle Scholar
Jimenez, R., & Haiman, Z. 2006, Nature, 441, 120CrossRefGoogle Scholar
Kashikawa, N., Shimasaku, K., Yasuda, N., et al. 2004, PASJ, 56, 1011CrossRefGoogle Scholar
Kewley, L. J., & Dopita, M. A. 2002, ApJS, 142, 35CrossRefGoogle Scholar
Malhotra, S., & Rhoads, J. E. 2002, ApJ, 565, L71CrossRefGoogle Scholar
Nagao, T., Kashikawa, N., Malkan, M. A., et al. 2005a, ApJ, 634, 142CrossRefGoogle Scholar
Nagao, T., Maiolino, R., & Marconi, A. 2006, A&A, 459, 85Google Scholar
Nagao, T., Motohara, K., Maiolino, R., et al. 2005b, ApJ, 631, L5CrossRefGoogle Scholar
Nagao, T., Murayama, T., Maiolino, R., et al. 2007, A&A, 468, 877Google Scholar
Nagao, T., Sasaki, S. S., Maiolino, R., et al. 2008, ApJ, 680, 100CrossRefGoogle Scholar
Nagao, T., Taniguchi, Y., Kashikawa, N., et al. 2004, ApJ, 613, L9CrossRefGoogle Scholar
Oh, S. P., Haiman, Z., & Rees, M. J. 2001, ApJ, 553, 73CrossRefGoogle Scholar
Ouchi, M., Shimasaku, K., Akiyama, M., et al. 2008, ApJS, 176, 301CrossRefGoogle Scholar
Scannapieco, E., Schneider, R., & Ferrara, A. 2003, ApJ, 589, 35CrossRefGoogle Scholar
Schaerer, D. 2002, A&A, 382, 28Google Scholar
Schaerer, D. 2003, A&A, 397, 527Google Scholar
Shapley, A. E., Steidel, C. C., Pettini, M., et al. 2003, ApJ, 588, 65CrossRefGoogle Scholar
Shimasaku, K., Kashikawa, N., Doi, M., et al. 2006, PASJ, 58, 313CrossRefGoogle Scholar
Taniguchi, Y., Ajiki, M., Nagao, T., et al. 2005, PASJ, 57, 165CrossRefGoogle Scholar
Tornatore, L., Ferrara, A., & Schneider, R. 2007, MNRAS, 382, 945CrossRefGoogle Scholar
Tumlinson, J., Giroux, M. L., & Shull, J. M. 2001, ApJ, 550, L1CrossRefGoogle Scholar
Tumlinson, J., & Shull, J. M. 2000, ApJ, 528, L65CrossRefGoogle Scholar
Tumlinson, J., Shull, J. M., & Venkatesan, A. 2003, ApJ, 584, 608CrossRefGoogle Scholar