UV-Bright LINERs and the AGN Connection

Details UV-Bright LINERs and the AGN Connection UV-Bright LINERs and the AGN Connection

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6112m&link_type=abstract

HST Proposal ID #6112

Computer Science

Hst Proposal Id #6112 Agn

Scientific paper

We propose UV spectroscopy of two LINER galaxies displaying bright compact ultraviolet nuclear sources in HST FOC images. Together with two additional objects already being observed in Cycle 4, these are two of the four LINERs that were detected as nuclear UV sources in a complete sample of over 100 nearby galaxies imaged with HST. They may be the subgroup of LINERs in which the ionizing continuum is unobscured along our line of sight. As such, they are prime targets for studying the UV properties of LINERs and relating them to AGNs as a whole. We will measure the continuum shapes, emission-line fluxes and absorption-line features of UV-bright LINERs. With these measurements, we will discriminate between the excitation mechanisms that have been proposed for LINERs. In particular, we will test whether the observed UV sources are the weakest manifestation of the quasar phenomenon, or else a compact young stellar cluster. Placing LINERS {which exist in a large fraction of all galaxies} into, or removing them from the AGN zoo is important for understanding the nature of AGNs, their number and evolution, and their contribution to the X-ray background. Together with ASCA and ISO data and existing optical spectra, HST will provide for the first time a multiwavelength picture of a statistical sample of LINERs which will be instrumental for deciphering their nature.

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