AAS 205th Meeting, 9-13 January 2005
Session 110 Active Galaxies
Poster, Wednesday, January 12, 2005, 9:20am-6:30pm, Exhibit Hall

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[110.19] Spitzer Observations of Arp 94: Mid-IR Evidence of Accretion onto a Dwarf Seyfert?

P. Appleton, L. Armus (SSC-Caltech), B. Brandl (Leiden), V. Charmandaris (Cornell), D. Domingue (GCSU), C Engelbracht (U. of Arizona), G. Helou (SSC-Caltech), S. Lord (HSC-Caltech), C. Mundell (Liverpool UK), J. Rho (SSC-Caltech), H. Spoon (Cornell), S. Stolovy, J. Surace, H. Teplitz (SSC-Caltech)

We present Spitzer observations of the interacting galaxy pair Arp 94 (NGC 3226/7) with IRAC, MIPS and the IRS. The observations, which show a wealth of structure within the Seyfert galaxy NGC 3227, also include the elliptical companion NGC 3226 (containing a "Dwarf Seyfert" nucleus). In this paper we describe the discovery of powerful PAH and molecular hydrogen emission from within NGC 3226. IRS observations show the molecular hydrogen is spatially extended, whereas the PAH emission is confined to the nucleus. In addition we present the discovery of PAH-emitting dust globules, and a possible accretion stream associated with NGC 3226--seen only at 8 microns with IRAC. The dust plume is closely associated with a kinematically distinct structure near the based of a large HI plume extending away from the galaxy. The observations suggest a connection between large-scale accretion, a known slowly rotating stellar disk, a starburst core and the AGN in NGC 3666.

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© 2004. The American Astronomical Society.