An Observational Pursuit for Population III Stars in a Lyman Alpha Emitter at z > 6 through He II Emission

Details An Observational Pursuit for Population III Stars in a Lyman Alpha Emitter at z > 6 through He II Emission An Observational Pursuit for Population III Stars in a Lyman Alpha Emitter at z > 6 through He II Emission

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...7e..12n&link_type=abstract

The Universe at z > 6, 26th meeting of the IAU, Joint Discussion 7, 17-18 August 2006, Prague, Czech Republic, JD07, #12

Physics

Scientific paper

We present a very deep near-infrared spectroscopic observation of a strong Lyman alpha emitter at z=6.33, SDF J132440.6+273607, which we used to search for He II 1640A. This emission line is expected if the target hosts a significant number of Population III stars. Even after 42 ksec of integration with the Subaru/OHS spectrograph, no emission-line features are detected in the J and H bands, which confirms that SDF J132440.6+273607 is neither an active galactic nucleus nor a low-z emission-line object. We obtained a 2 sigma upper limit of 9.06e-18 ergs/sec/cm2 on the He II 1640A emission-line flux, which corresponds to a luminosity of 4.11e+42 ergs/sec. This upper limit on the He II 1640A luminosity implies that the upper limit on the Population III star formation rate is in the range 4.9 - 41.2 M_sun/yr if Population III stars suffer no mass loss and in the range 1.8 - 13.2 M_sun/yr if strong mass loss is present. The non-detection of He II 1640A in SDF J132440.6+273607 at z=6.33 may thus disfavor weak feedback models for Population III stars.

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