Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9126b&link_type=abstract
HST Proposal ID #9126
Computer Science
Hst Proposal Id #9126 Galaxies
Scientific paper
We propose to obtain STIS long-slit spectra for a sample of 6 luminous, blue, compact galaxies {LBCGs} at z 0.6. Despite being very luminous {M_B -20}, LBCGs have velocity widths Sigma 60 kms and half-light radii r_e 0.5'' {or R_e 3Kpc}. Small sizes and velocity widths suggest LBCGs are low- mass stellar systems {Mla10^10M_odot}, while their blue colors, strong emission lines and low M/L-ratios indicate they are undergoing a major starburst. If the star-forming process halts after the current burst, models predict that LBCGs will fade by 2-4 magnitudes after a few Gyrs to reach the low luminosities and surface brightnesses characteristic of spheroidal galaxies. Thus we may be witnessing, in-situ, the last major episode of star formation in today's dwarf, low surface brightness galaxies such as NGC 205. However, recent observations suggest LBCGs are not a monolothic populations; some LBCGs may have different fates. Spatially-resolved spectroscopy will allow us to perform unique tests of this evolutionary scenario by providing: {i} measurements of rotational velocities -rather than Sigma- to determine whether LBCGs are indeed uniformly low-mass stellar systems; and {ii} evidence for substructure associated with SN-driven galactic winds, that may shed light on the ultimate fate of the ISM in LBCGs, and thus on whether it is reasonable to expect star formation to quench after the current burst.
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