RXTE observations of Markarian 501 during X-ray bright state in July 1997

Details RXTE observations of Markarian 501 during X-ray bright state in July 1997 RXTE observations of Markarian 501 during X-ray bright state in July 1997

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..69..403l&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 69, Issue 1-3, p. 403-406.

Physics

Nuclear Physics

Scientific paper

We report on Rossi X-ray Timing Explorer (RXTE) observations of Mrk 501 carried out in 1997 between July 11 and July 16 near its hitherto maximum X-ray and VHE gamma-ray brightness. The X-ray spectrum has been well detected up to 100keV and is best described by a broken powerlaw with spectral indices α1=0.70 and α2=0.94 below and above the break at Ebreak=5.8keV. As compared to quiescent state spectra of Mrk 501, both the radio to X-ray broad band spectrum as well the X-ray spectrum hardened dramatically. The X-ray flux from Mrk 501 declined and flared by ~30% within about 3 days each, showing an unusual anti-correlation of flux and spectral hardness of both powerlaw components.

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