AKARI Detection of Far-Infrared Dust Emission in the Halo of NGC 253
Abstract
We present new far-infrared (FIR) images of the edge-on starburst galaxy NGC 253 obtained with the Far-Infrared Surveyor (FIS) onboard AKARI at wavelengths of 90 μm and 140 μm. We have clearly detected FIR dust emission extended in the halo of the galaxy; there are two filamentary emission structures extending from the galactic disk up to 9 kpc in the northern and 6 kpc in the northwestern direction. From its spatial coincidence with the X-ray plasma outflow, the extended FIR emission is very likely to represent outflowing dust entrained by superwinds. The ratios of surface brightness at 90 μm to that at 140 μm suggest that the temperatures of the dust in the halo are getting higher in the regions far from the disk, implying that there exist extra dust heating sources in the halo of the galaxy.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2009
- DOI:
- 10.1088/0004-637X/698/2/L125
- arXiv:
- arXiv:0905.3800
- Bibcode:
- 2009ApJ...698L.125K
- Keywords:
-
- galaxies: halos;
- galaxies: individual: NGC 253;
- galaxies: starburst;
- infrared: galaxies;
- ISM: jets and outflows;
- Astrophysics - Galaxy Astrophysics
- E-Print:
- 4 pages, 3 figures, accepted for publication in the ApJL