ISSN:
1572-9508
Keywords:
galaxies
;
starburst
;
galaxies
;
individual
;
NGC253
;
infrared
;
galaxies
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We present high angular resolution (1.2″), narrow band (αλ/λ=0.1) images of the nucleus of NGC253 at three wavelengths in the mid-IR (8.5, 10.0, and 12.5 μm). We find that most of the mid-IR flux in the nucleus of NGC253 derives from a very small region ≤120 pc in diameter. Within this small region there are three spatially and spectrally distinct IR components: two bright compact sources, and a surrounding envelope of low level, diffuse emission. The mid-IR and 6cm radio are loosely correlated in position but not in brightness. The implication is that the mid-IR - radio correlation may begin to break down on small spatial scales relevant to individual star forming regions and large individual sources. These variations in the mid-IR spectra and in the radio-IR correlation imply that the nuclear emission is excited by more than one mechanism and source type.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00430148
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