Publication

Simultaneous x-ray and t[clc]e[/clc]v observations of a rapid flare from markarian 421

Maraschi, L.
; 
Fossati, G.
; 
Tavecchio, F.
; 
Chiappetti, L.
; 
Celotti, A.
; 
Ghisellini, G.
; 
Grandi, P.
; 
Pian, E.
; 
Tagliaferri, G.
; 
Treves, A.
... show 10 more
Identifiers
http://hdl.handle.net/10379/9486
https://doi.org/10.13025/23949
Repository DOI
10.1086/312370
Publication Date
1999-12-01
Keywords
bl lacertae objects : individual (markarian 421), galaxies : active, galaxies : jets, gamma rays : observations, x-rays : galaxies, lacertae object markarian-421, spectral energy-distributions, active galaxy markarian-421, multiwavelength observations, blazars, variability, emission, photons, bursts, jets
Type
Article
Downloads
Show all metadata
Citation
Maraschi, L. Fossati, G.; Tavecchio, F.; Chiappetti, L.; Celotti, A.; Ghisellini, G.; Grandi, P.; Pian, E.; Tagliaferri, G.; Treves, A.; Breslin, A. C.; Buckley, J. H.; Carter-Lewis, D. A.; Catanese, M.; Cawley, M. F.; Fegan, D. J.; Fegan, S.; Finley, J.; Gaidos, J.; Hall, T.; Hillas, A. M.; Krennrich, F.; Lessard, R. W.; Masterson, C.; Moriarty, P.; Quinn, J.; Rose, J.; Samuelson, F.; Weekes, T. C.; Urry, C. M.; Takahashi, T. (1999). Simultaneous x-ray and t[clc]e[/clc]v observations of a rapid flare from markarian 421. The Astrophysical Journal 526 (2), L81-L84
Abstract
Mrk 421 was observed for about 2 days with BeppoSAX in 1998 April as part of a worldwide multiwavelength campaign. A large, well-defined flare was observed in X-rays. The same flare was observed simultaneously at TeV energies by the Whipple Observatory gamma-ray telescope. These data provide (1) the first evidence that the X-ray and TeV intensities are well correlated on timescales of hours and (2) the first exactly simultaneous X-ray and TeV spectra. The results imply that the X-ray and TeV photons derive from the same region and from the same population of relativistic electrons. 'The physical parameters deduced from a homogeneous synchrotron self-Compton model for the spectral energy distribution yield electron cooling times close to the observed variability timescales.
Funder
Publisher
IOP Publishing
Publisher DOI
Rights
Attribution-NonCommercial-NoDerivs 3.0 Ireland
cbn
Collections
Externally hosted open access publications with University of Galway authors (1)