XMM - Newton observations of Markarian 421
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)E-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 (tau = 265 {+116} {-102} seconds) 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.
Cite
@article{arxiv.astro-ph/0011193,
title = {XMM - Newton observations of Markarian 421},
author = {W. Brinkmann and S. Sembay and R. G. Griffiths and G. Branduardi-Raymont and M. Gliozzi and Th. Boller and A. Tiengo and S. Molendi and S. Zane},
journal= {arXiv preprint arXiv:astro-ph/0011193},
year = {2009}
}
Comments
6 pages, 5 figures; accepted for publication in A&A special issue on first results from XMM