Simultaneous X-ray and TeV observations of a rapid flare from markarian 421

L. Maraschi; G. Fossati; F. Tavecchio; L. Chiappetti; A. Celotti; G. Ghisellini; P. Grandi; E. Pian; G. Tagliaferri; A. Treves; A. C. Breslin; J. H. Buckley; D. A. Carter-Lewis; M. Catanese; M. F. Cawley; D. J. Fegan; S. J. Fegan; J. P. Finley; J. A. Gaidos; Anthony Hall; A. M. Hillas; F. Krennrich; R. W. Lessard; Claire Masterson; Patrick Moriarty; J. Quinn; J. Rose; F. W. Samuelson; T. C. Weekes; C. M. Urry; T. Takahashi

doi:10.13025/23949

Simultaneous X-ray and TeV observations of a rapid flare from markarian 421

L. Maraschi
, G. Fossati
, F. Tavecchio
, L. Chiappetti
, A. Celotti
, G. Ghisellini
, P. Grandi
, E. Pian
, G. Tagliaferri
, A. Treves
, A. C. Breslin
, J. H. Buckley
, D. A. Carter-Lewis
, M. Catanese
, M. F. Cawley
, D. J. Fegan
, S. J. Fegan
, J. P. Finley
, J. A. Gaidos
, Anthony Hall

A. M. Hillas, F. Krennrich, R. W. Lessard, Claire Masterson, Patrick Moriarty, J. Quinn, J. Rose, F. W. Samuelson, T. C. Weekes, C. M. Urry, T. Takahashi

Research output: Contribution to a Journal (Peer & Non Peer) › Article › peer-review

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.

Original language	English (Ireland)
Number of pages	4
Journal	Astrophysical Journal
Volume	526
DOIs	https://doi.org/10.13025/23949 https://doi.org/10.1086/312370
Publication status	Published - 1 Dec 1999

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10.13025/23949Licence: CC BY-NC-ND
10.1086/312370

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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. J., Finley, J. P., Gaidos, J. A., ... Takahashi, T. (1999). Simultaneous X-ray and TeV observations of a rapid flare from markarian 421. Astrophysical Journal, 526. https://doi.org/10.13025/23949, https://doi.org/10.1086/312370

@article{82698f84f97e4b32bf25bcda6da77006,

title = "Simultaneous X-ray and TeV observations of a rapid flare from markarian 421",

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.",

author = "L. Maraschi and G. Fossati and F. Tavecchio and L. Chiappetti and A. Celotti and G. Ghisellini and P. Grandi and E. Pian and G. Tagliaferri and A. Treves and Breslin, \{A. C.\} and Buckley, \{J. H.\} and Carter-Lewis, \{D. A.\} and M. Catanese and Cawley, \{M. F.\} and Fegan, \{D. J.\} and Fegan, \{S. J.\} and Finley, \{J. P.\} and Gaidos, \{J. A.\} and Anthony Hall and Hillas, \{A. M.\} and F. Krennrich and Lessard, \{R. W.\} and Claire Masterson and Patrick Moriarty and J. Quinn and J. Rose and Samuelson, \{F. W.\} and Weekes, \{T. C.\} and Urry, \{C. M.\} and T. Takahashi",

year = "1999",

month = dec,

day = "1",

doi = "10.13025/23949",

language = "English (Ireland)",

volume = "526",

journal = "Astrophysical Journal",

}

Maraschi, L, Fossati, G, Tavecchio, F, Chiappetti, L, Celotti, A, Ghisellini, G, Grandi, P, Pian, E, Tagliaferri, G, Treves, A, Breslin, AC, Buckley, JH, Carter-Lewis, DA, Catanese, M, Cawley, MF, Fegan, DJ, Fegan, SJ, Finley, JP, Gaidos, JA, Hall, A, Hillas, AM, Krennrich, F, Lessard, RW, Masterson, C, Moriarty, P, Quinn, J, Rose, J, Samuelson, FW, Weekes, TC, Urry, CM & Takahashi, T 1999, 'Simultaneous X-ray and TeV observations of a rapid flare from markarian 421', Astrophysical Journal, vol. 526. https://doi.org/10.13025/23949, https://doi.org/10.1086/312370

TY - JOUR

T1 - Simultaneous X-ray and TeV observations of a rapid flare from markarian 421

AU - Maraschi, L.

AU - Fossati, G.

AU - Tavecchio, F.

AU - Chiappetti, L.

AU - Celotti, A.

AU - Ghisellini, G.

AU - Grandi, P.

AU - Pian, E.

AU - Tagliaferri, G.

AU - Treves, A.

AU - Breslin, A. C.

AU - Buckley, J. H.

AU - Carter-Lewis, D. A.

AU - Catanese, M.

AU - Cawley, M. F.

AU - Fegan, D. J.

AU - Fegan, S. J.

AU - Finley, J. P.

AU - Gaidos, J. A.

AU - Hall, Anthony

AU - Hillas, A. M.

AU - Krennrich, F.

AU - Lessard, R. W.

AU - Masterson, Claire

AU - Moriarty, Patrick

AU - Quinn, J.

AU - Rose, J.

AU - Samuelson, F. W.

AU - Weekes, T. C.

AU - Urry, C. M.

AU - Takahashi, T.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10379/9486

U2 - 10.13025/23949

DO - 10.13025/23949

M3 - Article

VL - 526

JO - Astrophysical Journal

JF - Astrophysical Journal

ER -

Simultaneous X-ray and TeV observations of a rapid flare from markarian 421

Abstract

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