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Astron. Astrophys. 344, L83-L86 (1999)

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Letter to the Editor

Submillimetre maps of the edge-on galaxy NGC 891

F.P. Israel 1, P.P. van der Werf 1 and R.P.J. Tilanus 2,3

1 Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, The Netherlands
2 Joint Astronomy Centre, 660 N. A'ohoku Pl., Hilo, Hawaii, 96720, USA
3 Netherlands Foundation for Research in Astronomy, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands

Received 20 April 1998 / Accepted 17 March 1999

Abstract

Broadband continuum images of the edge-on galaxy NGC 891 at 850 µm and 450 µm are presented. These images are very similar to the 1300 µm and CO line images. With respect to the 850 µm continuum, CO is strongest in the socalled molecular ring', and weakest at the largest radii sampled. Inside the molecular ring, the CO/850 µm ratio is somewhat less than in the ring, but higher than in the remainder of the disk. The integrated infrared emission from NGC 891 is dominated by small particles shortwards of 100 µm. Longwards of 100 µm, the emission can be equally well fitted by a single population of large dust grains at 21 K, or a bimodal population of grains at temperatures of 18 K and 27 K. The circumnuclear disk is at a temperature of at least 50 K, and probably much higher.

Key words: galaxies: active – galaxies: individual: NGC 891 – galaxies: ISM – galaxies: nuclei – infrared: galaxies

Send offprint requests to: F.P. Israel

Correspondence to: israel@strw.leidenuniv.nl

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© European Southern Observatory (ESO) 1999

Online publication: March 29, 1999
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