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Issue A&A
Volume 402, Number 1, April IV 2003
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20030358



A&A 402, L1-L4 (2003)
DOI: 10.1051/0004-6361:20030358

Letter

A gas and dust rich giant elliptical galaxy in the ISOPHOT Serendipity Survey

O. Krause1, U. Lisenfeld2, D. Lemke1, M. Haas1, U. Klaas1 and M. Stickel1

1  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
2  Instituto de Astrofisica de Andalucia, Camino Bajo de Huetor 24, 18080 Granada, Spain

(Received 12 February 2003 / Accepted 9 March 2003 )

Abstract
We present a multi-wavelength study of the unusual galaxy ISOSS J 15079+7247. With a bolometric luminosity of  $L_{\rm FIR} \sim 2 \times 10^{12}~{L_{\odot}}$ this object is one of the most luminous galaxies detected by the 170  ${\rm\mu m}$ ISOPHOT Serendipity Survey (ISOSS). We have obtained 1.2 mm continuum and CO (1-0) line observations, optical spectra and deep R-band images of the system. The CO emission originates from a giant elliptical galaxy at redshift z=0.2136, yielding a molecular gas mass of  $2.9 \times 10^{10}~{M_{\odot}}$. The 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 an opaque, hidden starburst in the center of the elliptical. The huge dust mass of $5 \times 10^{8}~{M_{\odot}}$ corresponds to a visual extinction of $A_{\rm V} \sim 1000~{\rm mag}$. This is consistent with the non-detection of any optical signatures of a strong starburst in ISOSS J 15079+7247 and the strength of non-thermal radio continuum emission.


Key words: galaxies: elliptical and lenticular, cD -- galaxies: evolution -- galaxies: starburst -- infrared: galaxies

Offprint request: O. Krause, krause@mpia-hd.mpg.de

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