Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.7704n&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #77.04; Bulletin of the American Astronomical Society, Vol. 25, p.1413
Other
Scientific paper
We present broadband ultraviolet images of NGC1068 made at 152 and 249nm with 3 arcsec resolution. The images were made using the Ultraviolet Imaging Telescope (UIT) in December 1990. The UV images are compared with ground-based Hα images having comparable resolution. Although the overall brightness distributions are similar in the UV and in Hα , we find significant differences when we compare the images in detail. In particular, the extremely luminous UV region 10 arcsec NW of the active nucleus is unremarkable in Hα . Several other regions are observed with differing UV and Hα appearances. We use the UV/Hα ratio in different regions to explore the recent star formation history of NGC1068. Although both the UV light and the Hα emission trace the young stellar population, the Hα tends to fade more quickly as the ionizing stars evolve off the main sequence; the UV continuum emission lasts longer, as it originates from a broader range of stellar ages and temperatures. Thus, the `knots' which are UV-bright but Hα -weak are probably regions currently containing young stars with intermediate masses (5-15 M_&sun;). Alternatively, the `knots' may have formed with a truncated IMF. We compare our observations to population synthesis models of Fanelli \it et al. to determine ages of the star- forming regions and to constrain the IMF in selected regions of NGC1068.
Bohlin Ralph Charles
Cheng Kwang-Peng
Fanelli Michael N.
Hintzen Paul M. N.
Neff Susan G.
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