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Gas properties in the disc of NGC 891 from Herschel far-infrared spectroscopy

Published online by Cambridge University Press:  09 February 2015

Thomas M. Hughes
Thomas M. Hughes*
Affiliation:
Astronomical Observatory, Ghent University, Belgium email: thomas.hughes@ugent.be
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Abstract

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We investigate the physical properties of the interstellar gas in the nearby edge-on spiral galaxy NGC 891, using Herschel PACS/SPIRE observations of the most important far-infrared (FIR) cooling lines – [Cii] 158 μm, [Nii] 122, 205 μm, [Oi] 63, 145 μm, and [Oiii] 88 μm – obtained as part of the Very Nearby Galaxy Survey (P. I.: C. D. Wilson). We compare our observations to the predictions of a photo dissociation region (PDR) model to determine the gas density, n, and the strength of the incident FUV radiation field, G0, on a pixel-by-pixel basis. The majority of PDRs in NGC 891's disc exhibit properties similar to the physical conditions found in the spiral arm and inter-arm regions of the face-on M51 galaxy. We estimate a stronger FUV field in the far north-eastern side than compared to the rest of the disc.

Keywords

galaxies: individual: NGC 891 - galaxies: spiral - ISM: lines and bands
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 319
Copyright
Copyright © International Astronomical Union 2015 

References

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