Mathematics – Logic
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713412t&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #134.12; Bulletin of the American Astronomical Society, Vol. 33, p.721
Mathematics
Logic
Scientific paper
Distant galaxies observed by HST appear to have primarily late-type, irregular, or peculiar morphologies. However, because of their high redshift they are observed in their restframe mid-UV. Nearby galaxies can look dramatically different in the rest-frame mid- and far-UV. We must therefore ask if these high redshift morphologies are due to real evolutionary effects or band-pass shifting and surface brightness dimming at high redshift. To address this, we have conducted a survey with HST of 37 nearby galaxies of various Hubble types and inclinations in two mid-UV bands. Most of these galaxies have supporting ground based data in UBVRJHK. A comparison of the photometric properties of these galaxies in these different band-passes will lead to a better ability to separate true evolutionary effects from the morphological K-correction. We will present and discuss preliminary results from the HST survey and ground-based observations in UBVR. Our preliminary results suggest that the late-types imaged so far are a heterogeneous mixture. More than half of the few irregulars/peculiars/mergers show a mid-UV F300W morphology that is similar to I-band F814W, but with important differences due to recognizable dust-lanes blocking out UV light, star-formation ``ridges,'' and hot stars or star-clusters that are mostly visible in F300W but not in F814W. Others yield significantly different classifications in F300W and F814W. We acknowledge NASA grant GO-8645.01-99A from STScI and the NASA Space Grant. This project is based on observations with the VATT: the Alice P. Lennon Telescope and the Thomas J. Bannan Astrophysics Facility.
Chiarenza C. A. T.
Conselice Christopher J.
de Grijs Richard
de Jong Roelof S.
Eskridge Paul B.
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