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

Patrick Moriarty

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

Patrick Moriarty

Physics

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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 greater than or equal to 316 GeV) can be well fitted by a power law of differential spectral index alpha = 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 alpha = 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 (Ireland)
Number of pages	6
Journal	Astrophysical Journal
Volume	621
Publication status	Published - 1 Mar 2005

Authors (Note for portal: view the doc link for the full list of authors)

Authors
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;Perez, ID;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;Le Bohec, S;Linton, E;Lloyd-Evans, J;Milovanovic, A;Moriarty, P;Muller, 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

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@article{6410fa4675164487a8eae3629ac84609,

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 greater than or equal to 316 GeV) can be well fitted by a power law of differential spectral index alpha = 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 alpha = 2.82 + - 0.15(stat) + - 0.30(sys). There is no compelling evidence for spectral variability or for any cutoff to the spectrum.",

author = "Patrick Moriarty",

year = "2005",

month = mar,

day = "1",

language = "English (Ireland)",

volume = "621",

journal = "Astrophysical Journal",

}

TY - JOUR

T1 - Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002

AU - Moriarty, Patrick

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 greater than or equal to 316 GeV) can be well fitted by a power law of differential spectral index alpha = 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 alpha = 2.82 + - 0.15(stat) + - 0.30(sys). 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 greater than or equal to 316 GeV) can be well fitted by a power law of differential spectral index alpha = 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 alpha = 2.82 + - 0.15(stat) + - 0.30(sys). There is no compelling evidence for spectral variability or for any cutoff to the spectrum.

M3 - Article

VL - 621

JO - Astrophysical Journal

JF - Astrophysical Journal

ER -

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

Abstract

Authors (Note for portal: view the doc link for the full list of authors)

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