LICHTI, G. G.; BOTTACINI, E.; AJELLO, Marco; CHARLOT, P.; COLLMAR, W.; FALCONE, A.; HORAN, D.; HUBER, S.; VON KIENLIN, A.; LÄHTEENMÄKI, A.; LINDFORS, E.; MORRIS, D.; NILSSON, K.; PETRY, D.; RÜGER, M.; SILLANPÄÄ, A.; SPANIER, F.; TORNIKOSKI, M.

doi:10.1051/0004-6361:20079199

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LICHTI, G. G.
Max-Planck-Institut für Extraterrestrische Physik [MPE]

BOTTACINI, E.

AJELLO, Marco

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Astronomy and Astrophysics - A&A. 2008, vol. 486, n° 3, p. 721-734

EDP Sciences

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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.< Réduire

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INTEGRAL observations of the blazar Mrk 421 in outburst (Results of a multi-wavelength campaign)

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