AKARI Detection of Far-Infrared Dust Emission in the Halo of NGC253

Details AKARI Detection of Far-Infrared Dust Emission in the Halo of NGC253 AKARI Detection of Far-Infrared Dust Emission in the Halo of NGC253

2009-05-23

arxiv.org/abs/0905.3800v2

Astrophys.J.698:L125-L128,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages, 3 figures, accepted for publication in the ApJL

Scientific paper

10.1088/0004-637X/698/2/L125

We present new far-infrared (FIR) images of the edge-on starburst galaxy NGC253 obtained with the Far-Infrared Surveyor (FIS) onboard AKARI at wavelengths of 90 um and 140 um. 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 um to that at 140 um 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.

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