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. Fegan; J. Finley; J. Gaidos; T. Hall; A. M. Hillas; F. Krennrich; R. W. Lessard; C. Masterson; P. Moriarty; J. Quinn; J. Rose; F. Samuelson; T. C. Weekes; C. M. Urry; T. Takahashi

doi:10.1086/312370

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. Fegan
, J. Finley
, J. Gaidos
, T. Hall

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

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
Pages (from-to)	L81-L84
Journal	Astrophysical Journal
Volume	526
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/312370
State	Published - Dec 1 1999

Keywords

BL Lacertae objects: Individual (Markarian 421)
Galaxies: active
Galaxies: jets
Gamma rays: observations
X-rays: galaxies

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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., Finley, J., Gaidos, J., ... Takahashi, T. (1999). Simultaneous X-ray and TeV observations of a rapid flare from Markarian 421. Astrophysical Journal, 526(2 PART 2), L81-L84. https://doi.org/10.1086/312370

@article{3408b8d5aee943fdad0dd1dcdd948e91,

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.",

keywords = "BL Lacertae objects: Individual (Markarian 421), Galaxies: active, Galaxies: jets, Gamma rays: observations, X-rays: galaxies",

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 S. Fegan and J. Finley and J. Gaidos and T. Hall and Hillas, \{A. M.\} and F. Krennrich and Lessard, \{R. W.\} and C. Masterson and P. Moriarty and J. Quinn and J. Rose and F. Samuelson and Weekes, \{T. C.\} and Urry, \{C. M.\} and T. Takahashi",

year = "1999",

month = dec,

day = "1",

doi = "10.1086/312370",

language = "English",

volume = "526",

pages = "L81--L84",

journal = "Astrophysical Journal",

issn = "0004-637X",

number = "2 PART 2",

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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, AC, Buckley, JH, Carter-Lewis, DA, Catanese, M, Cawley, MF, Fegan, DJ, Fegan, S, Finley, J, Gaidos, J, Hall, T, Hillas, AM, Krennrich, F, Lessard, RW, Masterson, C, Moriarty, P, Quinn, J, Rose, J, Samuelson, F, Weekes, TC, Urry, CM & Takahashi, T 1999, 'Simultaneous X-ray and TeV observations of a rapid flare from Markarian 421', Astrophysical Journal, vol. 526, no. 2 PART 2, pp. L81-L84. 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.

AU - Finley, J.

AU - Gaidos, J.

AU - Hall, T.

AU - Hillas, A. M.

AU - Krennrich, F.

AU - Lessard, R. W.

AU - Masterson, C.

AU - Moriarty, P.

AU - Quinn, J.

AU - Rose, J.

AU - Samuelson, F.

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.

KW - BL Lacertae objects: Individual (Markarian 421)

KW - Galaxies: active

KW - Galaxies: jets

KW - Gamma rays: observations

KW - X-rays: galaxies

UR - https://www.scopus.com/pages/publications/85088079969

U2 - 10.1086/312370

DO - 10.1086/312370

M3 - Article

AN - SCOPUS:85088079969

SN - 0004-637X

VL - 526

SP - L81-L84

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

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

Abstract

Keywords

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