Resolved Mid-IR Emission in the Narrow Line Region of NGC 4151

Details Resolved Mid-IR Emission in the Narrow Line Region of NGC 4151 Resolved Mid-IR Emission in the Narrow Line Region of NGC 4151

2002-12-12

arxiv.org/abs/astro-ph/0212307v1

Astrophys.J. 587 (2003) 117-122

Astronomy and Astrophysics

Astrophysics

accepted for publication in the Astrophysical Journal, 19 pages including 5 figures

Scientific paper

10.1086/367612

We present subarcsecond resolution mid infrared images of NGC 4151 at 10.8 micron and 18.2 micron. These images were taken with the University of Florida mid-IR camera/spectrometer OSCIR at the Gemini North 8-m telescope. We resolve emission at both 10.8 micron and 18.2 micron extending ~ 3.5" across at a P.A. of ~ 60 degrees. This coincides with the the narrow line region of NGC 4151 as observed in [OIII] by the Hubble Space Telescope. The most likely explanation for this extended mid-IR emission is dust in the narrow line region heated by a central engine. We find no extended emission associated with the proposed torus and place an upper limit on its mid-IR size of less than or equal to ~ 35 pc.

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