Open AccessResolved Mid‐Infrared Emission in the Narrow‐Line Region of NGC 4151
Author(s) -
James T. Radomski,
R. K. Piña,
C. Packham,
C. M. Telesco,
James M. De Buizer,
R. S. Fisher,
A. Robinson
Publication year - 2003
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/367612
Subject(s) - physics , hubble space telescope , astrophysics , line (geometry) , infrared , torus , telescope , emission spectrum , mid infrared , infrared telescope , doubly ionized oxygen , hubble sequence , astronomy , spitzer space telescope , galaxy , luminous infrared galaxy , optics , spectral line , laser , geometry , mathematics
We present subarcsecond resolution mid infrared images of NGC 4151 at 10.8micron and 18.2 micron. These images were taken with the University of Floridamid-IR camera/spectrometer OSCIR at the Gemini North 8-m telescope. We resolveemission 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 asobserved in [OIII] by the Hubble Space Telescope. The most likely explanationfor this extended mid-IR emission is dust in the narrow line region heated by acentral engine. We find no extended emission associated with the proposed torusand place an upper limit on its mid-IR size of less than or equal to ~ 35 pc.Comment: accepted for publication in the Astrophysical Journal, 19 pages including 5 figure
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