Journal
ASTRONOMY & ASTROPHYSICS
Volume 365, Issue 1, Pages L162-L167Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20000084
Keywords
BL Lac objects - general; galaxies : active - quasars; X-rays : general; radio sources : general
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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 (tau = 265(-102)(+116) 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.
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