XMM-Newton observations of the BL Lac MS 0737+7441

Details XMM-Newton observations of the BL Lac MS 0737+7441 XMM-Newton observations of the BL Lac MS 0737+7441

2000-10-31

arxiv.org/abs/astro-ph/0010649v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 Figures, accepted for publication in the special A&A Letters issue for XMM-Newton

Scientific paper

10.1051/0004-6361:20000055

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 2.38+-0.01 compared to the EPIC MOS data (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 N_H,Gal=3.2*10^20 cm^-2 which is N_H,fit(z=0.315)= (2.70+-0.20)*10^20cm^-2 in the EPIC pn data and N_H,fit(z=0.315)= (3.25+-0.25)*10^20cm^-2 in the EPIC MOS data assuming neutral gas and solar abundances. The flux variations are found to be of the order of 10 %.

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