Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..285k&link_type=abstract
Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present multi-wavelength observations of the unusual ultraluminous infrared galaxy (ULIRG) ISOSS J 15080+7248. The object was identified using the 170 μm ISOPHOT Serendipity Survey (ISOSS) in the search for cold and luminous extragalactic far-infrared sources. The dust emission of ISOSS J 15080+7248 is associated with a giant elliptical galaxy (MV = -22.6 mag) at redshift z = 0.214. 12CO(1-0) line observations reveal a molecular gas mass of MH_2 = 2 \cdot 1010 M&sun; which is unusually high for such an elliptical. Peculiar is moreover the absence of any optical line emission from this luminous ( LIR = 2 \cdot 1012 L&sun;) galaxy with a star formation rate of 350 M&sun; yr-1, as inferred from the bolometric infrared luminosity. Our observations contrast with the known population of local ULIRGs, which are virtually all advanced mergers of gas rich spirals and characterized by optical emission line spectra and warm dust emission due to their strong star formation activity. The undisturbed elliptical morphology, the presence of a de Vaucouleur r1/4 brightness profile and a low gas-to-dust ratio and dust temperature let us suggest that ISOSS J 15080+7248 is either a giant elliptical merging a gas rich spiral or a relaxed merger between two spirals on the transition into a massive elliptical system. Such sources might have been overlooked in surveys based on the IRAS data, which were biased towards the warm dust emission at the peak of star formation activity.
Klaas Ulrich
Krause Oliver
Lemke Dietrich
Lisenfeld Ute
Stickel Manfred
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