Volume 365, Number 1, January 2001
First Results from XMM-Newton
|Page(s)||L162 - L167|
|Published online||15 January 2001|
XMM-Newton observations of Markarian 421*
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 Science Operation Centre, Villafranca Satellite Tracking Station, 28080 Madrid, Spain
5 Istituto di Fisica Cosmica "G. Occhialini", Via Bassini 15, 20133, Italy
Corresponding author: W. Brinkmann, email@example.com
Accepted: 30 October 2000
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
© ESO, 2001
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