Abstract
Mid-infrared observations of the galactic center region were obtained at 4, 11, 29, and 27 micrometers on three rocket-borne experiments. The diffuse emission around the galactic center can be separated into three components: (a) a foreground emission from the galactic disk and the 4-5 kpc ring, (b) a spheroidal component surrounding the center, due to unresolved stellar sources of T > 2000 K, and (c) a diffuse elliptical component immediately surrounding the galactic center. The color temperatures of (a) and (c) are consistent with an interpretation of a two-component source of emission from warm dust (about 400 K) characteristic of circumstellar dust shells and cooler dust from extended low-density H II regions. Current models for the infrared emission from interstellar grains cannot reproduce our spectral distribution in the mid-infrared.
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