Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001newar..45..351t&link_type=abstract
New Astronomy Reviews, Volume 45, Issue 4-5, p. 351-354.
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new spectroscopic observations for a sample of galaxies selected at 2000 Å. Nebular emission line measurements allow us to address issues of excitation, reddening and metallicity. The UV and Hα luminosity functions strengthen earlier assertions that the local volume-averaged star formation rate (SFR) is higher than indicated from optically selected surveys. Our data combined with recent redshift survey results suggest a more modest evolutionary trend at /z<1 than previously reported. We also find that the UV flux indicates a consistently higher mean SFR than that implied by the Hα luminosity for typical constant or declining SFR. Whilst we can explain most of our observations by intense starburst activity, there remains a small population with extreme UV-optical colours which cannot be understood.
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