BeppoSAX Observations of the BL Lac Object Mkn 501 in an Intermediate State

Simple item page
dc.creatorPian, Elena
dc.creatorPalazzi, Eliana
dc.creatorChiappetti, Lucio
dc.creatorMaraschi, Laura
dc.creatorTavecchio, Fabrizio
dc.creatorGhisellini, Gabriele
dc.creatorTagliaferri, Gianpiero
dc.creatorFossati, Giovanni
dc.creatorTreves, Aldo
dc.creatorUrry, Claudia Megan
dc.creatorVacanti, Giuseppe
dc.date1998-10-24
dc.date.accessioned2026-07-07T02:28:42Z
dc.date.available2026-07-07T02:28:42Z
dc.descriptionThe BL Lac object Mkn 501 was observed with the BeppoSAX satellite at three epochs in April-May 1998, simultaneously with the Whipple and HEGRA Cherenkov telescopes. The X-ray spectrum is well detected up to 70 keV and it exhibits, at all epochs, a continuous curvature, which is here modeled with three power-laws of increasingly steeper index at larger energies. In the nu*f_nu representation the spectrum exhibits a peak at ~20 keV, which is interpreted as the maximum of the synchrotron emission. This implies that the synchrotron peak energy has lowered by an order of magnitude with respect to the powerful X-ray outburst observed in April 1997. The simultaneous TeV flux was comparable to the lowest levels observed for Mkn 501, possibly suggesting that the peak of the inverse Compton radiation had also shifted toward lower energies.
dc.description4 pages, Latex, 1 PostScript figure, to appear in the Proceedings of the "BL Lac Phenomenon" Conference held in Turku, 1998 June 22-26, ed. Leo Takalo
dc.identifierhttps://arxiv.org/abs/astro-ph/9810398
dc.identifierhttp://arxiv.org/abs/astro-ph/9810398
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13177
dc.subjectAstrophysics
dc.titleBeppoSAX Observations of the BL Lac Object Mkn 501 in an Intermediate State
dc.typetext

Files

Collections

arXiv