ISOPHOT far-infrared photometry of NGC 3079

Free access article

Issue		A&A Volume 391, Number 3, September I 2002


Page(s)		911 - 915
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20020922

A&A 391, 911-915 (2002)
DOI: 10.1051/0004-6361:20020922

Research Note

ISOPHOT far-infrared photometry of NGC 3079

U. Klaas¹ and H. J. Walker²

¹ Max-Planck-Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
² CLRC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK

(Received 13 June 2002 / Accepted 17 June 2002)

Abstract
FIR photometry (from 15 $\mu$ m to 200 $\mu$ m) of NGC 3079 which is resolved by ISOPHOT at 60 $\mu$ m is presented. With the assumption of an unresolved core plus an extended disk component, good consistency with IRAS and SCUBA data is found. The SED of the total flux between 60 $\mu$ m and the submm can be modelled by the superposition of three dust components with temperatures of 32 K, 20 K and 12 K. The emission of the extended disk component is 1/3 of the unresolved core component in the 60-180 $\mu$ m range, from 200 $\mu$ m onwards its relative contribution increases. The resulting dust mass of $3.8\times10^{7}~M_{\odot}$ is consistent with a total gas-to-dust mass ratio of 200, close to the canonical value found for the Milky Way. These results demonstrate an appropriate way to disentangle and characterize the main dust components by combining ISOPHOT FIR data from the ISO Data Archive with submm data from SCUBA.

Key words: radiation mechanisms: thermal -- astronomical data bases: ISO data archive -- infrared: galaxies -- galaxies: individual: NGC 3079 -- galaxies: photometry

Offprint request: U. Klaas, klaas@mpia.de

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