Mathematics – Logic
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713411c&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #134.11; Bulletin of the American Astronomical Society, Vol. 33, p.721
Mathematics
Logic
Scientific paper
Current samples of high redshift galaxies are primarily observed in their restframe mid-UV. They often resemble nearby late type galaxies, but are they really physically similar classes of objects? To explore this question we did a systematic imaging survey with the HST/WFPC2 of 37 nearby galaxies in two mid-UV bands. Our sample is carefully selected for size and surface brightness over a wide range of Hubble types and inclinations. All objects (will) have ground based UBVRIJ(H)K images, and 15 have far UV UIT images. The mid-UV is the missing keystone. With it we can examine the distribution of star formation and its history, dust, the SED's of star forming regions, and differentiate between age and metallicity. Our first results from this Cycle 9 project are: (1) Early type galaxies can show significant changes from the mid-UV to the red. Some are quite dim in the UV, reflecting their old stellar population. Others become point sources in the mid-UV (LINER's, Seyferts). This raises the question to what extent the apparently strong cosmological evolution of weak AGN in early type galaxies is due to ``morphological K-correction.'' (2) Mid type spirals and star forming galaxies can appear as later or different types in the mid-UV. Dust lanes are well traceable comparing F300W to F814W. We see a considerable range in scale and surface brightness of individual star-forming regions. We acknowledge NASA ADP grant NAG-6740, ASU NASA Space Grants, and NASA grants GO-8645.01-99A and AR-8765.01-99A from STScI. 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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