The nature of cold sources from the 170 micron ISOPHOT Serendipity Survey

Details The nature of cold sources from the 170 micron ISOPHOT Serendipity Survey The nature of cold sources from the 170 micron ISOPHOT Serendipity Survey

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt.........3k&link_type=abstract

PhD Thesis, Combined Faculties for the Natural Sciences and for Mathematics of the Ruperto-Carola University of Heidelberg, Germ

Astronomy and Astrophysics

Astronomy

13

Infrared-Astronomy, Ism, Star Formation, Infrared Galaxies, Elliptical Galaxies

Scientific paper

The European Infrared Space Observatory ISO performed for the first time a sky survey with high spatial resolution in the previously unexplored far infrared wavelength range between 120 and 240 micron. The unique data base of the ISOPHOT Serendipity Survey (ISOSS) was searched for galactic and extragalactic sources with dust temperatures below 20 K, which previous methods failed to identify. Extensive groundbased follow-up campaigns from optical to radio wavelengths were performed for detailed studies of the newly discovered objects. 35 compact galactic molecular clouds are good candidates for massive star forming regions in an early evolutionary stage due to their high masses (M ~ 100 - 104 Msun) and low dust temperatures (T ~ 12-18 K). A detailed study of the newly discovered object ISOSS J 20298+3559 reveals the coexistence of different stages of stellar evolution from gravitationally bound prestellar cloud cores to a Herbig B2 star with an accretion disc. Submillimeter follow-up observations of 40 cold and luminous ISOSS galaxies proved that large amounts of 20 K dust were previously not detected. A remarkable object of the survey is the gas and dust rich giant elliptical galaxy ISOSS J 15079+7247. Despite the non-detection of any optical signatures of activity, the elliptical could be identified as the counterpart of an ultraluminous infrared galaxy. This has important implications for the nature of submillimeter galaxies as demonstrated for the brightest submillimeter-source in the Hubble Deep Field, HDF 850.1.

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