Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002

M. K. Daniel; H. M. Badran; I. H. Bond; P. J. Boyle; S. M. Bradbury; J. H. Buckley; D. A. Carter-Lewis; M. Catanese; O. Celik; P. Cogan; W. Cui; M. D'Vali; I. De La Calle Perez; C. Duke; A. Falcone; D. J. Fegan; S. J. Fegan; J. P. Finley; L. F. Fortson; J. A. Gaidos; S. Gammell; K. Gibbs; G. H. Gillanders; J. Grube; J. Hall; T. A. Hall; D. Hanna; A. M. Hillas; J. Holder; D. Horan; T. B. Humensky; A. Jarvis; M. Jordan; G. E. Kenny; M. Kertzman; D. Kieda; J. Kildea; J. Knapp; K. Kosack; H. Krawczynski; F. Krennrich; M. J. Lang; S. L.E. Bohec; E. Linton; J. Lloyd-Evans; A. Milovanovic; P. Moriarty; D. Müller; T. Nagai; S. Nolan; R. A. Ong; R. Pallassini; D. Petry; B. Power-Mooney; J. Quinn; M. Quinn; K. Ragan; P. Rebillot; P. T. Reynolds; H. J. Rose; M. Schroedter; G. H. Sembroski; S. P. Swordy; A. Syson; V. V. Vassiliev; S. P. Wakely; G. Walker; T. C. Weekes; J. Zweerink

doi:10.1086/427406

Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002

M. K. Daniel, H. M. Badran, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter-Lewis, M. Catanese, O. Celik, P. Cogan, W. Cui, M. D'Vali, I. De La Calle Perez, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. F. Fortson, J. A. GaidosS. Gammell, K. Gibbs, G. H. Gillanders, J. Grube, J. Hall, T. A. Hall, D. Hanna, A. M. Hillas, J. Holder, D. Horan, T. B. Humensky, A. Jarvis, M. Jordan, G. E. Kenny, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, M. J. Lang, S. L.E. Bohec, E. Linton, J. Lloyd-Evans, A. Milovanovic, P. Moriarty, D. Müller, T. Nagai, S. Nolan, R. A. Ong, R. Pallassini, D. Petry, B. Power-Mooney, J. Quinn, M. Quinn, K. Ragan, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, A. Syson, V. V. Vassiliev, S. P. Wakely, G. Walker, T. C. Weekes, J. Zweerink

Physics and Astronomy (Twin Cities)

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Abstract

The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cerenkov Telescope in 2002 May. A spectral analysis has been carried out on the data from that time period, and the resulting very high energy gamma-ray spectrum (E ≥ 316 GeV) can be well fitted by a power law of differential spectral index α = 2.78 ± 0.12_stat ± 0.21_sys. On 2002 June 4, the source flared dramatically in the gamma-ray range without any coincident increase in the X-ray emission, providing the first unambiguous example of an "orphan" gamma-ray flare from a blazar. The gamma-ray spectrum for these data can also be described by a simple power-law fit with α = 2.82 ± 0.15_stat ± 0.30_sys. There is no compelling evidence for spectral variability or for any cutoff to the spectrum.

Original language	English (US)
Pages (from-to)	181-187
Number of pages	7
Journal	Astrophysical Journal
Volume	621
Issue number	1 I
DOIs	https://doi.org/10.1086/427406
State	Published - Mar 1 2005

Keywords

Gamma rays: observations
Techniques: spectroscopic

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Daniel, M. K., Badran, H. M., Bond, I. H., Boyle, P. J., Bradbury, S. M., Buckley, J. H., Carter-Lewis, D. A., Catanese, M., Celik, O., Cogan, P., Cui, W., D'Vali, M., De La Calle Perez, I., Duke, C., Falcone, A., Fegan, D. J., Fegan, S. J., Finley, J. P., Fortson, L. F., ... Zweerink, J. (2005). Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002. Astrophysical Journal, 621(1 I), 181-187. https://doi.org/10.1086/427406

Daniel, MK, Badran, HM, Bond, IH, Boyle, PJ, Bradbury, SM, Buckley, JH, Carter-Lewis, DA, Catanese, M, Celik, O, Cogan, P, Cui, W, D'Vali, M, De La Calle Perez, I, Duke, C, Falcone, A, Fegan, DJ, Fegan, SJ, Finley, JP, Fortson, LF, Gaidos, JA, Gammell, S, Gibbs, K, Gillanders, GH, Grube, J, Hall, J, Hall, TA, Hanna, D, Hillas, AM, Holder, J, Horan, D, Humensky, TB, Jarvis, A, Jordan, M, Kenny, GE, Kertzman, M, Kieda, D, Kildea, J, Knapp, J, Kosack, K, Krawczynski, H, Krennrich, F, Lang, MJ, Bohec, SLE, Linton, E, Lloyd-Evans, J, Milovanovic, A, Moriarty, P, Müller, D, Nagai, T, Nolan, S, Ong, RA, Pallassini, R, Petry, D, Power-Mooney, B, Quinn, J, Quinn, M, Ragan, K, Rebillot, P, Reynolds, PT, Rose, HJ, Schroedter, M, Sembroski, GH, Swordy, SP, Syson, A, Vassiliev, VV, Wakely, SP, Walker, G, Weekes, TC & Zweerink, J 2005, 'Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002', Astrophysical Journal, vol. 621, no. 1 I, pp. 181-187. https://doi.org/10.1086/427406

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title = "Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002",

abstract = "The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cerenkov Telescope in 2002 May. A spectral analysis has been carried out on the data from that time period, and the resulting very high energy gamma-ray spectrum (E ≥ 316 GeV) can be well fitted by a power law of differential spectral index α = 2.78 ± 0.12stat ± 0.21sys. On 2002 June 4, the source flared dramatically in the gamma-ray range without any coincident increase in the X-ray emission, providing the first unambiguous example of an {"}orphan{"} gamma-ray flare from a blazar. The gamma-ray spectrum for these data can also be described by a simple power-law fit with α = 2.82 ± 0.15stat ± 0.30sys. There is no compelling evidence for spectral variability or for any cutoff to the spectrum.",

keywords = "Gamma rays: observations, Techniques: spectroscopic",

author = "Daniel, {M. K.} and Badran, {H. M.} and Bond, {I. H.} and Boyle, {P. J.} and Bradbury, {S. M.} and Buckley, {J. H.} and Carter-Lewis, {D. A.} and M. Catanese and O. Celik and P. Cogan and W. Cui and M. D'Vali and {De La Calle Perez}, I. and C. Duke and A. Falcone and Fegan, {D. J.} and Fegan, {S. J.} and Finley, {J. P.} and Fortson, {L. F.} and Gaidos, {J. A.} and S. Gammell and K. Gibbs and Gillanders, {G. H.} and J. Grube and J. Hall and Hall, {T. A.} and D. Hanna and Hillas, {A. M.} and J. Holder and D. Horan and Humensky, {T. B.} and A. Jarvis and M. Jordan and Kenny, {G. E.} and M. Kertzman and D. Kieda and J. Kildea and J. Knapp and K. Kosack and H. Krawczynski and F. Krennrich and Lang, {M. J.} and Bohec, {S. L.E.} and E. Linton and J. Lloyd-Evans and A. Milovanovic and P. Moriarty and D. M{\"u}ller and T. Nagai and S. Nolan and Ong, {R. A.} and R. Pallassini and D. Petry and B. Power-Mooney and J. Quinn and M. Quinn and K. Ragan and P. Rebillot and Reynolds, {P. T.} and Rose, {H. J.} and M. Schroedter and Sembroski, {G. H.} and Swordy, {S. P.} and A. Syson and Vassiliev, {V. V.} and Wakely, {S. P.} and G. Walker and Weekes, {T. C.} and J. Zweerink",

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month = mar,

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doi = "10.1086/427406",

language = "English (US)",

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AU - Daniel, M. K.

AU - Badran, H. M.

AU - Bond, I. H.

AU - Boyle, P. J.

AU - Bradbury, S. M.

AU - Buckley, J. H.

AU - Carter-Lewis, D. A.

AU - Catanese, M.

AU - Celik, O.

AU - Cogan, P.

AU - Cui, W.

AU - D'Vali, M.

AU - De La Calle Perez, I.

AU - Duke, C.

AU - Falcone, A.

AU - Fegan, D. J.

AU - Fegan, S. J.

AU - Finley, J. P.

AU - Fortson, L. F.

AU - Gaidos, J. A.

AU - Gammell, S.

AU - Gibbs, K.

AU - Gillanders, G. H.

AU - Grube, J.

AU - Hall, J.

AU - Hall, T. A.

AU - Hanna, D.

AU - Hillas, A. M.

AU - Holder, J.

AU - Horan, D.

AU - Humensky, T. B.

AU - Jarvis, A.

AU - Jordan, M.

AU - Kenny, G. E.

AU - Kertzman, M.

AU - Kieda, D.

AU - Kildea, J.

AU - Knapp, J.

AU - Kosack, K.

AU - Krawczynski, H.

AU - Krennrich, F.

AU - Lang, M. J.

AU - Bohec, S. L.E.

AU - Linton, E.

AU - Lloyd-Evans, J.

AU - Milovanovic, A.

AU - Moriarty, P.

AU - Müller, D.

AU - Nagai, T.

AU - Nolan, S.

AU - Ong, R. A.

AU - Pallassini, R.

AU - Petry, D.

AU - Power-Mooney, B.

AU - Quinn, J.

AU - Quinn, M.

AU - Ragan, K.

AU - Rebillot, P.

AU - Reynolds, P. T.

AU - Rose, H. J.

AU - Schroedter, M.

AU - Sembroski, G. H.

AU - Swordy, S. P.

AU - Syson, A.

AU - Vassiliev, V. V.

AU - Wakely, S. P.

AU - Walker, G.

AU - Weekes, T. C.

AU - Zweerink, J.

PY - 2005/3/1

Y1 - 2005/3/1

N2 - The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cerenkov Telescope in 2002 May. A spectral analysis has been carried out on the data from that time period, and the resulting very high energy gamma-ray spectrum (E ≥ 316 GeV) can be well fitted by a power law of differential spectral index α = 2.78 ± 0.12stat ± 0.21sys. On 2002 June 4, the source flared dramatically in the gamma-ray range without any coincident increase in the X-ray emission, providing the first unambiguous example of an "orphan" gamma-ray flare from a blazar. The gamma-ray spectrum for these data can also be described by a simple power-law fit with α = 2.82 ± 0.15stat ± 0.30sys. There is no compelling evidence for spectral variability or for any cutoff to the spectrum.

AB - The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cerenkov Telescope in 2002 May. A spectral analysis has been carried out on the data from that time period, and the resulting very high energy gamma-ray spectrum (E ≥ 316 GeV) can be well fitted by a power law of differential spectral index α = 2.78 ± 0.12stat ± 0.21sys. On 2002 June 4, the source flared dramatically in the gamma-ray range without any coincident increase in the X-ray emission, providing the first unambiguous example of an "orphan" gamma-ray flare from a blazar. The gamma-ray spectrum for these data can also be described by a simple power-law fit with α = 2.82 ± 0.15stat ± 0.30sys. There is no compelling evidence for spectral variability or for any cutoff to the spectrum.

KW - Gamma rays: observations

KW - Techniques: spectroscopic

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UR - http://www.scopus.com/inward/citedby.url?scp=20244385964&partnerID=8YFLogxK

U2 - 10.1086/427406

DO - 10.1086/427406

M3 - Article

AN - SCOPUS:20244385964

SN - 0004-637X

VL - 621

SP - 181

EP - 187

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002

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