Research Note

ISOPHOT far-infrared photometry of NGC 3079 ^*

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

Corresponding author: U. Klaas, klaas@mpia.de

Received: 13 June 2002
Accepted: 17 June 2002

Abstract

FIR photometry (from 15 μm to 200 μm) of NGC 3079 which is resolved by ISOPHOT at 60 μm 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 μm 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 μm range, from 200 μm onwards its relative contribution increases. The resulting dust mass of 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.