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Title:
XMM-Newton observations of the BL Lac MS 0737+7441
Authors:
Boller, Th.; Gliozzi, M.; Griffiths, G.; Sembay, S.; Keil, R.; Schwentker, O.; Brinkmann, W.; Vercellone, S.
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AB(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AC(X-Ray Astronomy Group, Department of Physics and Astronomy, Leicester University, Leicester LE1 7RH, UK), AD(X-Ray Astronomy Group, Department of Physics and Astronomy, Leicester University, Leicester LE1 7RH, UK), AE(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AF(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AG(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany), AH(Istituto di Fisica Cosmica "G. Occhialini", CNR, Milano, Italy)
Publication:
Astronomy and Astrophysics, v.365, p.L158-L161 (2001) (A&A Homepage)
Publication Date:
01/2001
Origin:
EDP Sciences
Astronomy Keywords:
GALAXIES: ACTIVE, GALAXIES: INDIVIDUAL: MS 0737.9+7441, X-, AYS: GALAXIES} } OBSERVATIONS OF THE BL LAC MS 0737+7441
DOI:
10.1051/0004-6361:20000055
Bibliographic Code:
2001A&A...365L.158B

Abstract

We report on the XMM-Newton observations of the BL Lac object MS 0737.9+7441 during the performance verification phase. A simple power-law fit provides an adequate description of the integrated spectrum in the 0.2-10 keV energy band. The photon index is slightly steeper in the EPIC pn data with Gamma = (2.38 +/- 0.01) compared to the EPIC MOS data (Gamma = (2.28 +/- 0.01)). The difference is most probably due to the present uncertainties in the calibration of the EPIC MOS and EPIC pn data sets. We report evidence for intrinsic absorption in the distant BL Lac above the Galactic column (NH, Gal = 3.2 1020 {cm-2}) which is NH, fitz=0.315 = (2.70 +/- 0.20) 1020 cm-2 in the EPIC pn data and NH, fitz=0.315 = (3.25 +/- 0.25) 1020 cm-2 in the EPIC MOS data assuming neutral gas and solar abundances. The flux variations are found to be of the order of 10%. No significant spectral variability is detected. Based on observations with XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).
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