Optical and X-ray observations of the EUV-selected Seyfert galaxy RE J2248-511: a true `soft X-ray excess' AGN?
Abstract
Optical and soft X-ray (0.1-2.0 keV) data of a rare, EUV-selected Seyfert 1 galaxy, RE J2248-511, are presented. Fits to the soft X-ray spectrum suggest that either (a) this AGN has been viewed through a `hole' in the local Galactic column density (N_H<10^20 cm^-2) or (b) RE J2248-511 exhibits a strong ultrasoft X-ray excess below ~0.25 keV. The EUV (0.09-0.21 keV) count rate inferred from new pointed ROSAT PSPC data is twice that originally measured by the Wide Field Camera during the ROSAT All-Sky Survey and, in scenario (b), suggests an ultrasoft X-ray excess which was substantially weaker during the All-Sky Survey observation. The soft X-ray flux also weakens by 14 per cent during the pointed PSPC observation (a time-scale of 16h), but there are no significant spectral changes.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- October 1995
- DOI:
- 10.1093/mnras/276.4.1281
- Bibcode:
- 1995MNRAS.276.1281P
- Keywords:
-
- GALAXIES: ACTIVE;
- GALAXIES: INDIVIDUAL: RE J2248-511;
- GALAXIES: SEYFERT;
- X-RAYS: GALAXIES