New Evidence for an Anisotropic Radiation Field in NGC 5252

Details New Evidence for an Anisotropic Radiation Field in NGC 5252 New Evidence for an Anisotropic Radiation Field in NGC 5252

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418..668p&link_type=abstract

Astrophysical Journal v.418, p.668

Astronomy and Astrophysics

Astronomy

22

Galaxies: Active, Galaxies: Individual Ngc Number: Ngc 5252, Galaxies: Seyfert, Radio Continuum: Galaxies

Scientific paper

Observational evidence accumulated over the last decade strongly supports the idea that the ionizing radiation field in active galactic nuclei (AGNs) is anisotropic. Here we report on new evidence for this anisotropy in the particular case of the Seyfert 2 galaxy NGC 5252. H I observations of this galaxy reveal neutral gas surrounding the nucleus but located outside the bicone of ionized gas that notably characterizes this object. The neutral gas is at a distance from the nucleus where it could be reached by the ionizing radiation if this were isotropically distributed.

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