BeppoSAX observations of the radio-quiet QSO MR 2251-178

Details BeppoSAX observations of the radio-quiet QSO MR 2251-178 BeppoSAX observations of the radio-quiet QSO MR 2251-178

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.459..329o&link_type=abstract

In: Exploring the gamma-ray universe. Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain. Editor:

Physics

Agn, Radio Quiet Qsos, X-Rays: General

Scientific paper

We present the 0.1-200 keV BeppoSAX spectrum of MR 2251-178 observed at two epochs in 1998 separated by 5 months. Both epochs show identical spectral shape and X-ray flux. Analysis of the combined spectra allow us to confirm the presence of the ionized Fe Kα line detected by ASCA and to test the presence of reflection from ionized material. The best spectral fit is obtained when including a contribution from a mildly ionized reflector (Ξ5-20keV ~ 350 erg cm s-1) with a reflection normalization Rion ~ 0.17. An exponential cut-off to the direct power-law continuum is then required at E ~ 100 keV. Finally, we briefly discuss the spectral and variability properties of a second, much weaker X-ray source in the same field of view. The source, EXO 2251.1-1737, most likely is an AGN, although it has so far been classified as a star.

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