Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9361a&link_type=abstract
HST Proposal ID #9361
Computer Science
Hst Proposal Id #9361
Scientific paper
Do primeval galaxies exist in the local Universe? The best candidates are extremely metal-poor {Z < 1/20 Zo} blue compact dwarf {BCD} galaxies whose photometric and chemical properties are consistent with a stellar population younger than 100 Myr. SBS 1415+437 {Z = 1/21 Zo} is the closest candidate: its proximity {d = 11.4 Mpc}, detailed spectroscopic knowledge of its HII regions and low metal content, used to infer the primordial He^4 abundance, make it the best target for this investigation. We propose to take deep exposures of SBS 1415+437 with the ACS in the F814W and F606W filters. This instrument has resolution and magnitude limits allowing us to reach and resolve with the required accuracy individual stars 1 mag below the tip of the red giant branch {RGBT}. If present, these stars will provide a clear sign of an old stellar population {with ages > 1 Gyr} and an independent distance indicator. If absent, this will unambiguously show that the system has started to form stars only recently and can be considered the first robust case of local primeval galaxy. We propose to take exposures in the F658N {HAlpha Lambda6563} and FR505N {HBeta Lambda4861} filters to study the morphology of the ionized gas through HAlpha emission and map the dust content with the HAlpha/HBeta ratio in order to solve the age-dust degeneracy of the photometry by constraining reddening effects.
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