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

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..380o&link_type=abstract

GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 380-384 (2001).

Astronomy and Astrophysics

Astrophysics

X-Ray Sources, X-Ray Bursts, Active And Peculiar Galaxies And Related Systems, Quasars

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. A good spectral fit is obtained when including a contribution from a mildly ionized reflector (ξ0.01-100keV~1625 erg cm s-1) with a reflection normalization Rion~0.11. 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. This source, EXO 2251.1-1737, most likely is an AGN, although it has so far been classified as a star. .

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