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Astron. Astrophys. 315, L82-L84 (1996)

Analysis of the ISOPHOT FIR maps of M51 and M101*

H. Hippelein1, D. Lemke1, M. Haas1, C.M. Telesco3, R.J. Tuffs2, H.J. Völk2, C. Xu2, U. Klaas4, and U. Kinkel4

1 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2 Max-Planck-Institut für Kernphysik, Saupfercheckweg, D-69117 Heidelberg, Germany
3 Department of Astronomy, University of Florida, Gainesville, FL 32611, USA
4 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
at present ISO Ground Observatory, Villafranca, Spain

Received 11 July 1996 / Accepted 5 September 1996

Abstract. The far-IR ISOPHOT maps of the spiral galaxies M51 and M101 at 60, 100, and at 175 img1.gifm are analysed. For all areas in these galaxies the spectral energy distributions can be fitted with a single-temperature emission curve. Colours and dust temperatures were estimated for interesting sub-fields. The temperatures vary between 33K for HII regions, and 28K for the disk, arm and interarm regimes.

Key words: galaxies - star formation - dust

* ISO is an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.

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