Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11587f&link_type=abstract
HST Proposal ID #11587. Cycle 17
Physics
Scientific paper
Population III {Pop III} stars, the first generation, metal-free stars in the Universe, have been a main focus of the studies of early galaxy formation and reionization. HeII 1640 emission originates from energetic ionizing photons beyond 54.4eV, and is an ideal tracer of massive Pop III star formation with strong far-UV radiation. HeII has not yet been detected directly in individual galaxies at z<6.3, indicating a small contribution of Pop III star formation at those redshifts. We propose to use WFC3 narrow-band imaging to measure the flux of HeII emission in galaxy IOK-1 {z=6.96}, the highest redshift spectroscopically confirmed galaxy to date. At this redshift, the HeII line is perfectly located in the WFC3 F130N filter passband. Our deep narrow-band imaging will detect a HeII flux down to 4x10^-18 erg/s/cm^2 at the 5-sigma level, corresponding to a star formation rate from massive Pop III stars of 1 M_sun per year, a factor of 5 improvement to the best ground-based results at lower redshift. Strong HeII emission, if detected, will provide the first direct evidence of significant Pop III formation in early galaxies at the end of the reionization epoch. We will also carry out short F125W broad-band observations to measure the rest-frame UV flux of this galaxy in order to constrain its total star formation rate and to provide continuum subtraction for narrow-band imaging.;
No associations
LandOfFree
Probing Population III Star Formation in a z=7 Galaxy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Probing Population III Star Formation in a z=7 Galaxy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Probing Population III Star Formation in a z=7 Galaxy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1320221