a Search for Very Low-Luminosity Active Galactic Nuclei in Nearby Galaxies: CYCLE3SUPPLEMENTAL

Details a Search for Very Low-Luminosity Active Galactic Nuclei in Nearby Galaxies: CYCLE3SUPPLEMENTAL a Search for Very Low-Luminosity Active Galactic Nuclei in Nearby Galaxies: CYCLE3SUPPLEMENTAL

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4360s&link_type=abstract

HST Proposal ID #4360

Mathematics

Logic

Hst Proposal Id #4360

Scientific paper

Using UV (F220W + F210M) and red (F600M) images obtained with the FOC/96, we will search for spatially unresolved, UV-bright nuclei in nearby galaxies. The goals are to discover very low-luminosity AGNs, and to see whether there is a lower limit to the activity. This is a natural extension of the large spectroscopic survey we have already conducted at Palomar. Galaxies to be observed are those in which broad H-alpha emission was either NOT detected or possibly detected in our ground-based study, but whose morphology (Hubble type) and narrow emission lines appear similar to those of galaxies in which broad H-alpha WAS detected. Ultraviolet images of 13 nearby galaxies will be obtained during Cycle 3. In future cycles, we will propose spectroscopic observations of the most probable AGNs detected through the imaging study. In most galaxies, low-luminosity active nuclei are very difficult to discern at optical wavelengths due to the dominance of the stellar continuum. At UV wavelengths, on the other hand, contamination from the old stellar population is low, making it possible to detect a nonstellar continuum. As by-products of this study, we will publish UV surface photometry of the observed galaxies, and we will identify interesting morphological features (e.g., dust lanes, blue stars, HII regions). Moreover, we will be able to recognize compact cores that may be produced by massive central black holes.

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