High Resolution Mid-IR Images of the Nucleus of M81

Details High Resolution Mid-IR Images of the Nucleus of M81 High Resolution Mid-IR Images of the Nucleus of M81

2001-03-27

arxiv.org/abs/astro-ph/0103459v2

Astronomy and Astrophysics

Astrophysics

You can get the most current ps copy all in one go at http://panisse.lbl.gov/public/bruce/mirlin.tar.gz . This version has bee

Scientific paper

10.1086/323948

We observed two nearby galaxies with potential or weak indications of nuclear activity, M32 and M81, with the MIRLIN mid-IR camera at N band (10.79 microns). M32 is not detected, but we give detailed measurements of the nucleus of M81. Our observations of M81 show a bright nuclear point source at N, and comparison to measurements made in the early 1970's gives an increase in nuclear flux of nearly a factor of two. If the comparison is accurate, the nuclear mid-IR emission must ultimately be powered by a variable, compact source, similar to that in Seyferts and quasars. M81 has been classified in the literature as a low-luminosity LINER, not a pure Seyfert galaxy. Further, it has been suggested that this and other low-luminosity AGN may have intrinsically different spectra than Seyferts and quasars. However, we find that the relative fluxes in the X-ray, MIR, and radio bands, all essentially unaffected by extinction and galaxy pollution, show a nuclear continuum remarkably like that of a bona fide Seyfert or quasar.

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