Hubble Space Telescope WFPC2 Imaging of a Sample of Early-Type Seyfert Galaxies

Details Hubble Space Telescope WFPC2 Imaging of a Sample of Early-Type Seyfert Galaxies Hubble Space Telescope WFPC2 Imaging of a Sample of Early-Type Seyfert Galaxies

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apjs..128..139f&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 128, Issue 1, pp. 139-169.

Astronomy and Astrophysics

Astronomy

51

Galaxies: Active, Galaxies: Ism, Galaxies: Nuclei, Galaxies: Seyfert, Galaxies: Structure

Scientific paper

We have defined a complete sample comprising all 14 Seyfert galaxies in early-type (E, S0, Sa) host galaxies with apparent magnitude mv<14.5 mag and recessional velocity cz<3000 km s-1. This paper presents Hubble Space Telescope (HST) imaging observations of 12 of them, the other two having been observed previously with HST. The observations are of the [O III] λ5007 and [N II] λλ6548, 6583+Hα emission lines and their adjacent continua (centered near 5500 and 8000 Å). We find that all the galaxies in our sample display prominent nuclear dust features. In some objects, the dust strongly influences the morphology of the starlight and ionized gas. Despite the restriction to early-type galaxies, five (possibly six) galaxies of the 14 have a significant (if not dominant) part of their [N II]+Hα emission originating in H II regions. This result supports the notion that the Seyfert phenomenon tends to be associated with ongoing star formation. Based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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