A Spitzer Space Telescope Infrared Survey of Supernova Remnants in the Inner Galaxy

Abstract

Using Infrared Array Camera (IRAC) images at 3.6, 4.5, 5.8, and 8 microns from the GLIMPSE Legacy science program on the Spitzer Space Telescope, we searched for infrared counterparts to the 95 known supernova remnants that are located within galactic longitudes 65>|l|>10 degrees and latitudes |b|<1 degree. Eighteen infrared counterparts were detected. Many other supernova remnants could have significant infrared emission but are in portions of the Milky Way too confused to allow separation from bright HII regions and pervasive mid-infrared emission from atomic and molecular clouds along the line of sight. Infrared emission from supernova remnants originates from synchrotron emission, shock-heated dust, atomic fine-structure lines, and molecular lines. The detected remnants are G11.2-0.3, Kes 69, G22.7-0.2, 3C 391, W 44, 3C 396, 3C 397, W 49B, G54.4-0.3, Kes 17, Kes 20A, RCW 103, G344.7-0.1, G346.6-0.2, CTB 37A, G348.5-0.0, and G349.7+0.2. The infrared colors suggest emission from molecular lines (9 remnants), fine-structure lines (3), and PAH (4), or a combination; some remnants feature multiple colors in different regions. None of the remnants are dominated by synchrotron radiation at mid-infrared wavelengths. The IRAC-detected sample emphasizes remnants interacting with relatively dense gas, for which most of the shock cooling occurs through molecular or ionic lines in the mid-infrared.

Accepted 10/18/2005 for publication in "The Astronomical Journal". The figures in this astro-ph submission are drastically reduced in quality in order to fit within its limits

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• CO observations toward supernova remnants with associated OH 1720 MHz masers
• Infrared Spectroscopy of Molecular Supernova Remnants
• Molecular and Ionic shocks in the Supernova Remnant 3C391
• Detection of Far-Infrared Water Vapor, Hydroxyl, and Carbon Monoxide Emissions from the Supernova Remnant 3C 391
• A Compact Central Object in the Supernova Remnant Kes 79
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• Near-Infrared Synchrotron Emission from Cas A
• A molecular shell with star formation toward the supernova remnant G349.7+0.2
• An ASCA Study of the High Luminosity SNR G349.7+0.2
• The Expansion of G11.2-0.3, a Radio Composite Supernova Remnant
• Spatially Resolved Low Frequency VLA observations of the Supernova Remnant 3C 391
• Observation of Kes 27: A Typical Mixed-Morphology SNR

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