Limits on the X-ray emission from several hyperluminous IRAS galaxies
R. J. Wilman, A. C. Fabian, R. M. Cutri, C. S. Crawford, W. N. Brandt
Abstract
We report long, pointed ROSAT HRI observations of the hyperluminous galaxies IRAS F00235+1024, F12514+1027, F14481+4454 and F14537+1950. Two of them are optically classified as Seyfert-like. No X-ray sources are detected at the positions of any of the objects, with a mean upper limit L(X)/L(Bol) of 2.3 times 10-4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities N(H)>1023 cm-2. They differ markedly from `ordinary' Seyfert 2 galaxies, bearing a closer resemblance in the soft X-ray band to composite Seyfert 2 galaxies or to some types of starburst.
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