Detection of widely-distributed UIR band emission in the disk of NGC 891

Details Detection of widely-distributed UIR band emission in the disk of NGC 891 Detection of widely-distributed UIR band emission in the disk of NGC 891

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..941m&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 941

Computer Science

1

Ism: Uir Emission, Ism: Galaxies

Scientific paper

The spectrum of the unidentified infrared emission bands (UIRB) between 5.8 and 11.6 μm has been observed for the first time in the disk of an external galaxy where the interstellar radiation field (ISRF) is quite low as compared to the nuclear regions. We used PHT-S, the low-resolution spectrometer of the ISOPHOT instrument (PHT) aboard ISO. The UIRBs at 6.2, 7.7, 8.6, and 11.3 μm have absolute intensities which are similar to the values observed for the diffuse emission of our own Galaxy. The UIRBs between 5.9 and 11.7 μm contribute ~9% of the total IR radiation of NGC 891. The intensity ratios and band widths in the NGC 891 disk emission are similar to the galactic nebulae and diffuse emission, pointing to a common carrier for the UIRBs in the two galaxies. However there are some notable variations of the band ratios along the major axis of the galaxy.

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