Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-16
Astronomy and Astrophysics
Astrophysics
15 pages, 18 figures; accepted by Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20079199
We report the results of a multi-wavelength campaign on the blazar Mrk 421 during outburst. We observed four strong flares at X-ray energies that were not seen at other wavelengths (partially because of missing data). From the fastest rise in the X-rays, an upper limit could be derived on the extension of the emission region. A time lag between high-energy and low-energy X-rays was observed, which allowed an estimation of the magnetic-field strength. The spectral analysis of the X-rays revealed a slight spectral hardening of the low-energy (3 - 43 keV) spectral index. The hardness-ratio analysis of the Swift-XRT (0.2 - 10 keV) data indicated a small correlation with the intensity; i. e., a hard-to-soft evolution was observed. At the energies of IBIS/ISGRI (20 - 150 keV), such correlations are less obvious. A multiwavelength spectrum was composed and the X-ray and bolometric luminosities are calculated.
Ajello Marco
Bottacini Eugenio
Charlot Patrick
Collmar Werner
Falcone Abraham
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