Limits on the X-ray emission from several hyperluminous IRAS galaxies
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~=2.3x10^-4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities N_H>10^23cm^-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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- October 1998
- DOI:
- 10.1046/j.1365-8711.1998.02047.x
- arXiv:
- arXiv:astro-ph/9808324
- Bibcode:
- 1998MNRAS.300L...7W
- Keywords:
-
- GALAXIES: INDIVIDUAL: IRAS F00235+1024;
- GALAXIES: INDIVIDUAL: F12514+1027;
- GALAXIES: INDIVIDUAL: F14481+4454;
- GALAXIES: INDIVIDUAL: F14537+1950;
- INFRARED: GALAXIES;
- X-RAYS: GALAXIES;
- Astrophysics
- E-Print:
- 4 pages, 1 figure. Accepted for publication in MNRAS