Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..872k&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
With a bolometric luminosity of LFIR = 2x1012 Lsun ISOSS J 15079+7247 is one of the most luminous and unusual galaxies detected by the 170 micron ISOPHOT Serendipity Survey (ISOSS). 1.2 mm continuum CO (1-0) line observations optical spectra and deep R-band images of the object were obtained. We detected CO emission from a giant elliptical galaxy at redshift z = 0.2136 yielding a molecular gas mass of 3x1010 Msun. This high gas mass favors the picture that the dust emission is associated with the elliptical galaxy. The nature of the ultraluminous IR emission can be explained by a hidden starburst in the center of the elliptical. This is also supported by the strength of non-thermal radio continuum emission. The huge dust mass of 5x108 Msun corresponds to a visual extinction of AV ~ 1000 mag. This is consistent with the non-detection of any optical signatures of a strong starburst in ISOSS J 15079+7247. The observations demonstrate that ellipticals cannot be excluded as counterparts for luminous infrared galaxies. The large amount of molecular gas and dust in an elliptical galaxy like ISOSS J 15079+7247 allows an alternative explanation of the nature of a number of high-redshifted submm-galaxies.
Haas Marcel
Klaas Ulrich
Krause Oliver
Lemke Deitrich
Lisenfeld Ute
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