AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 49. Observations of Nearby AGN (Seyferts and LINERs
Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southwest Exhibit Hall

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[49.02] The Ionization Mechanism of LINER Galaxy NGC1052

J. R. Gabel, F. C. Bruhweiler (CUA / IACS), D. M. Crenshaw, S. B. Kraemer (GSFC / CUA), C. L. Miskey (CUA / IACS)

We present a study of archival Hubble Space Telescope (HST) data of the low ionization nuclear emission line region (LINER) galaxy, NGC1052. The WFPC2 imagery clearly differentiates extended nebular emission from the compact core. Faint Object Spectrograph (FOS) observations provide a full set of optical UV data (1200-6800Å). This data set samples the innermost region (0."86 x 0."86 ~ 82pc x 82pc) and excludes the extended emission, which may be powered by different processes than the compact component. Furthermore, the extensive set of available emission line data allows a detailed analysis of the physical conditions within the nucleus. From the measured H\alpha/H\beta ratio, we find significant internal reddening (E(B-V)=0.42) for the nuclear emission. Photoionization models using a two component power law spectra are computed, using the fewest assumptions possible. The dereddened emission line fluxes can be well fit by a simple model comprised of a gas that is stratified in density and photoionized by a rather flat central continuum source, \alphauv=-1.2 and \alphax=-0.7. We compare these results to previous studies that included modeling by shocks.

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