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- W1655944735 abstract "Mrk 501 has been in a state of very high flux in X-rays and VHE gamma-rays during 1997. In July 1997 near its hitherto maximum X-ray brightness intense multifrequency observations of Mrk 501 have been performed at radio, near infrared, optical, X-ray, and VHE gamma-ray frequencies. Here we report on Rossi X-ray Timing Explorer (RXTE) observations carried out in 1997 between July 11 and July 16. The X-ray spectrum has been well detected up to 100 keV and is best described by a broken power law with spectral indices alpha1=0.70 and alpha2=0.94 below and above the break energy 5.8 keV. The X-ray flux from Mrk 501 declined and flared by about 30% within about 3 days each, showing an unusual anti-correlation between flux and spectral hardening of both power law components. The break energy remained constant. The observed broad band and X-ray spectra confirm recent observations, that the synchrotron component in Mrk 501 can extend up to energies of 100 keV with the maximum power being emitted at hard X-rays. On longer time-scales the cut-off frequency of the synchrotron spectrum changes by more than two orders of magnitude." @default.
- W1655944735 created "2016-06-24" @default.
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- W1655944735 date "1998-01-02" @default.
- W1655944735 modified "2023-09-27" @default.
- W1655944735 title "Markarian 501 in X-ray bright state - RXTE observations" @default.
- W1655944735 hasPublicationYear "1998" @default.
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