Observational Search for Population III Stars in High-Redshift Galaxies

Details Observational Search for Population III Stars in High-Redshift Galaxies Observational Search for Population III Stars in High-Redshift Galaxies

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..255...79n&link_type=abstract

Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies, Proceedings of the International Astronomical Union, IAU

Astronomy and Astrophysics

Astronomy

Early Universe, Galaxies: Evolution, Galaxies: Formation, Stars: Early-Type

Scientific paper

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&sun; 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 × 10-6 M&sun; 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.

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