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A&A 365, L162-L167 (2001)
DOI: 10.1051/0004-6361:20000084
XMM-Newton observations of Markarian 421
W. Brinkmann1, S. Sembay2, R. G. Griffiths2, G. Branduardi-Raymont3, M. Gliozzi1, Th. Boller1, A. Tiengo4, S. Molendi5 and S. Zane3.1 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85740 Garching, Germany
2 X-Ray Astronomy Group, Department of Physics and Astronomy, University of Leicester, LE1 7RH, UK
3 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK
4 XMM-Newton Science Operation Centre, Villafranca Satellite Tracking Station, 28080 Madrid, Spain
5 Istituto di Fisica Cosmica "G. Occhialini", Via Bassini 15, 20133, Italy
(Received 2 October 2000 / Accepted 30 October 2000)
Abstract
The BL Lac object Mrk 421 was observed on May 25, 2000 during the
XMM-Newton Cal/PV phase. The high throughput of the X-ray telescopes and the spectral capabilities
of the instruments allow an uninterrupted temporal and spectral study of the
source with unprecedented time resolution. Mrk 421 was found at a relatively high state with a
2-6 keV flux of (1.3-1.9) 10-10 erg cm-2 s-1. The observed intensity variations by more than a factor of three at highest X-ray energies are accompanied by complex spectral
variations with only a small time lag (
s) between the hard and soft photons. The (0.2-10) keV spectrum can be well fitted by a broken power law and no absorption structures are found in the source spectrum at
the high spectral resolution of the transmission gratings.
Key words: BL Lac objects -general; galaxies: active -quasars; X-rays: general -radio sources: general
Offprint request: W. Brinkmann, wpb@mpe.mpg.de
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