Properties of Luminous Blue Compact Galaxies at z< 1 and the Global Star Formation Rate Density

Details Properties of Luminous Blue Compact Galaxies at z< 1 and the Global Star Formation Rate Density Properties of Luminous Blue Compact Galaxies at z< 1 and the Global Star Formation Rate Density

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..191l&link_type=abstract

NOAO Proposal ID #2001A-0191

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Scientific paper

Luminous blue compact galaxies (LBCGs) are important to understand because they are implicated as significant contributers both to the high global SFR density observed at z~1 and to the strong evolution of field galaxies between z=1 and the present. However, we do not yet have a good measure of their SFRs - both individual and global. Are LBCGs at redshifts z> 0.4 the analogs of local H II galaxies or even of Lyman break galaxies at z~3? What are their metallicity and dust extinction properties? Access to Hα, the best SFR measure, is problematic for intermediate redshift. Here we propose to address the above questions by obtaining near-IR spectra with FLAMINGOS of a well- selected sample of LBCGs to measure Hα fluxes directly. With fluxes in hand, we will: (1) measure SFRs using the most direct indicator available; (2) compare Hα to O II SFRs to calibrate O II estimators for other samples; (3) calculate the contribution of our sample to the global SFR density; (4) use Hα/Hβ ratios to measure dust extinction; (5) combine EW(Hα) and K magnitudes to compute stellar masses; and (6) synthesize the above to investigate the putative link connecting H II galaxies today, LBCGs at moderate redshift, and LBGs at z~3. Our sample is selected from our ongoing studies of compact star-forming galaxies in the HDF-N and three other fields with deep HST, Keck, and optical spectroscopic data in hand.

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