HST observations of the (O III) emission-line region in Markarian 78

Details HST observations of the (O III) emission-line region in Markarian 78 HST observations of the (O III) emission-line region in Markarian 78

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421...87c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 421, no. 1, p. 87-91

Astronomy and Astrophysics

Astronomy

16

Emission Spectra, Hubble Space Telescope, Line Spectra, Photoionization, Radio Emission, Seyfert Galaxies, Faint Object Camera, Far Infrared Radiation, Infrared Astronomy Satellite, Spaceborne Astronomy, Ultraviolet Astronomy

Scientific paper

We present the results of Hubble Space Telescope (HST) observations of Mrk 78, a Seyfert 2 galaxy. Observations were taken with the Faint Object Camera using the F550M, F502M (which includes the (O III) lambda lambda-4959, 5007 emission lines), and F130M filters. These are medium band filters centered at 5500, 5020, and 1300 A, respectively. The (O III) image shows a biconical shape with a full opening angle of 40 deg, elongated in the direction of the radio structure, with its apex approximately coincident with the center of both the radio and optical continuum. A resolved (0.8 sec in extent) obscuring region is present close to the center of the cone. The UV image confirms the result that emission from the nucleus is not seen directly. Our results provide a strong observational support for the 'occultation/reflection' model for Seyfert 2 galaxies. We discuss the relation between radio and emission-line regions and propose a pure photoionization origin for the (O III) emission. Finally, we test the occultation model by comparing our observations with the Infrared Astronomy Satellite (IRAS) data: a strongly anisotropic nuclear source is required to meet the energy requirement derived from the analysis of the far-infrared emission.

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