VERITAS Observations of the γ-Ray Binary LS I +61 303

V. A. Acciari; M. Beilicke; G. Blaylock; S. M. Bradbury; J. H. Buckley; V. Bugaev; Y. Butt; K. L. Byrum; O. Celik; A. Cesarini; L. Ciupik; Y. C. K. Chow; P. Cogan; P. Colin; W. Cui; M. K. Daniel; C. Duke; T. Ergin; A. D. Falcone; S. J. Fegan; J. P. Finley; P. Fortin; L. F. Fortson; D. Gall; K. Gibbs; G. H. Gillanders; J. Grube; R. Guenette; D. Hanna; E. Hays; J. Holder; D. Horan; S. B. Hughes; C. M. Hui; T. B. Humensky; P. Kaaret; D. B. Kieda; J. Kildea; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; K. Lee; G. Maier; A. McCann; M. McCutcheon; J. Millis; P. Moriarty; R. Mukherjee; T. Nagai; R. A. Ong; D. Pandel; J. S. Perkins; F. Pizlo; M. Pohl; J. Quinn; K. Ragan; P. T. Reynolds; H. J. Rose; M. Schroedter; G. H. Sembroski; A. W. Smith; D. Steele; S. P. Swordy; J. A. Toner; L. Valcarcel; V. V. Vassiliev; R. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; R. J. White; D. A. Williams; S. A. Wissel; M. Wood; B. Zitzer

doi:10.1086/587736

VERITAS Observations of the γ-Ray Binary LS I +61 303

V. A. Acciari, M. Beilicke, G. Blaylock, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, K. L. Byrum, O. Celik, A. Cesarini, L. Ciupik, Y. C. K. Chow, P. Cogan, P. Colin, W. Cui, M. K. Daniel, C. Duke, T. Ergin, A. D. Falcone, S. J. FeganJ. P. Finley, P. Fortin, L. F. Fortson, D. Gall, K. Gibbs, G. H. Gillanders, J. Grube, R. Guenette, D. Hanna, E. Hays, J. Holder, D. Horan, S. B. Hughes, C. M. Hui, T. B. Humensky, P. Kaaret, D. B. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, K. Lee, G. Maier, A. McCann, M. McCutcheon, J. Millis, P. Moriarty, R. Mukherjee, T. Nagai, R. A. Ong, D. Pandel, J. S. Perkins, F. Pizlo, M. Pohl, J. Quinn, K. Ragan, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. P. Swordy, J. A. Toner, L. Valcarcel, V. V. Vassiliev, R. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, R. J. White, D. A. Williams, S. A. Wissel, M. Wood, B. Zitzer

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Abstract

LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy γ-rays. The system was observed over several orbital cycles (between 2006 September and 2007 February) with the VERITAS array of imaging air Cerenkov telescopes. A signal of γ-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Γ = 2.40 +/- 0.16_stat+/- 0.2_sys and a flux above 300 GeV corresponding to 15%-20% of the flux from the Crab Nebula....

Original language	English
Journal	The Astrophysical Journal
DOIs	https://doi.org/10.1086/587736
Publication status	Published - Jun 2008

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10.1086/587736

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Acciari, V. A., Beilicke, M., Blaylock, G., Bradbury, S. M., Buckley, J. H., Bugaev, V., Butt, Y., Byrum, K. L., Celik, O., Cesarini, A., Ciupik, L., Chow, Y. C. K., Cogan, P., Colin, P., Cui, W., Daniel, M. K., Duke, C., Ergin, T., Falcone, A. D., ... Zitzer, B. (2008). VERITAS Observations of the γ-Ray Binary LS I +61 303. The Astrophysical Journal. https://doi.org/10.1086/587736

@article{d97f10b723fd4ba2a2adc2d5a2feb7aa,

title = "VERITAS Observations of the γ-Ray Binary LS I +61 303",

abstract = "LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy γ-rays. The system was observed over several orbital cycles (between 2006 September and 2007 February) with the VERITAS array of imaging air Cerenkov telescopes. A signal of γ-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Γ = 2.40 +/- 0.16stat+/- 0.2sys and a flux above 300 GeV corresponding to 15\%-20\% of the flux from the Crab Nebula....",

author = "Acciari, \{V. A.\} and M. Beilicke and G. Blaylock and Bradbury, \{S. M.\} and Buckley, \{J. H.\} and V. Bugaev and Y. Butt and Byrum, \{K. L.\} and O. Celik and A. Cesarini and L. Ciupik and Chow, \{Y. C. K.\} and P. Cogan and P. Colin and W. Cui and Daniel, \{M. K.\} and C. Duke and T. Ergin and Falcone, \{A. D.\} and Fegan, \{S. J.\} and Finley, \{J. P.\} and P. Fortin and Fortson, \{L. F.\} and D. Gall and K. Gibbs and Gillanders, \{G. H.\} and J. Grube and R. Guenette and D. Hanna and E. Hays and J. Holder and D. Horan and Hughes, \{S. B.\} and Hui, \{C. M.\} and Humensky, \{T. B.\} and P. Kaaret and Kieda, \{D. B.\} and J. Kildea and A. Konopelko and H. Krawczynski and F. Krennrich and Lang, \{M. J.\} and S. LeBohec and K. Lee and G. Maier and A. McCann and M. McCutcheon and J. Millis and P. Moriarty and R. Mukherjee and T. Nagai and Ong, \{R. A.\} and D. Pandel and Perkins, \{J. S.\} and F. Pizlo and M. Pohl and J. Quinn and K. Ragan and Reynolds, \{P. T.\} and Rose, \{H. J.\} and M. Schroedter and Sembroski, \{G. H.\} and Smith, \{A. W.\} and D. Steele and Swordy, \{S. P.\} and Toner, \{J. A.\} and L. Valcarcel and Vassiliev, \{V. V.\} and R. Wagner and Wakely, \{S. P.\} and Ward, \{J. E.\} and Weekes, \{T. C.\} and A. Weinstein and White, \{R. J.\} and Williams, \{D. A.\} and Wissel, \{S. A.\} and M. Wood and B. Zitzer",

year = "2008",

month = jun,

doi = "10.1086/587736",

language = "English",

journal = "The Astrophysical Journal",

}

Acciari, VA, Beilicke, M, Blaylock, G, Bradbury, SM, Buckley, JH, Bugaev, V, Butt, Y, Byrum, KL, Celik, O, Cesarini, A, Ciupik, L, Chow, YCK, Cogan, P, Colin, P, Cui, W, Daniel, MK, Duke, C, Ergin, T, Falcone, AD, Fegan, SJ, Finley, JP, Fortin, P, Fortson, LF, Gall, D, Gibbs, K, Gillanders, GH, Grube, J, Guenette, R, Hanna, D, Hays, E, Holder, J, Horan, D, Hughes, SB, Hui, CM, Humensky, TB, Kaaret, P, Kieda, DB, Kildea, J, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, MJ, LeBohec, S, Lee, K, Maier, G, McCann, A, McCutcheon, M, Millis, J, Moriarty, P, Mukherjee, R, Nagai, T, Ong, RA, Pandel, D, Perkins, JS, Pizlo, F, Pohl, M, Quinn, J, Ragan, K, Reynolds, PT, Rose, HJ, Schroedter, M, Sembroski, GH, Smith, AW, Steele, D, Swordy, SP, Toner, JA, Valcarcel, L, Vassiliev, VV, Wagner, R, Wakely, SP, Ward, JE, Weekes, TC, Weinstein, A, White, RJ, Williams, DA, Wissel, SA, Wood, M & Zitzer, B 2008, 'VERITAS Observations of the γ-Ray Binary LS I +61 303', The Astrophysical Journal. https://doi.org/10.1086/587736

TY - JOUR

T1 - VERITAS Observations of the γ-Ray Binary LS I +61 303

AU - Acciari, V. A.

AU - Beilicke, M.

AU - Blaylock, G.

AU - Bradbury, S. M.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Butt, Y.

AU - Byrum, K. L.

AU - Celik, O.

AU - Cesarini, A.

AU - Ciupik, L.

AU - Chow, Y. C. K.

AU - Cogan, P.

AU - Colin, P.

AU - Cui, W.

AU - Daniel, M. K.

AU - Duke, C.

AU - Ergin, T.

AU - Falcone, A. D.

AU - Fegan, S. J.

AU - Finley, J. P.

AU - Fortin, P.

AU - Fortson, L. F.

AU - Gall, D.

AU - Gibbs, K.

AU - Gillanders, G. H.

AU - Grube, J.

AU - Guenette, R.

AU - Hanna, D.

AU - Hays, E.

AU - Holder, J.

AU - Horan, D.

AU - Hughes, S. B.

AU - Hui, C. M.

AU - Humensky, T. B.

AU - Kaaret, P.

AU - Kieda, D. B.

AU - Kildea, J.

AU - Konopelko, A.

AU - Krawczynski, H.

AU - Krennrich, F.

AU - Lang, M. J.

AU - LeBohec, S.

AU - Lee, K.

AU - Maier, G.

AU - McCann, A.

AU - McCutcheon, M.

AU - Millis, J.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - Nagai, T.

AU - Ong, R. A.

AU - Pandel, D.

AU - Perkins, J. S.

AU - Pizlo, F.

AU - Pohl, M.

AU - Quinn, J.

AU - Ragan, K.

AU - Reynolds, P. T.

AU - Rose, H. J.

AU - Schroedter, M.

AU - Sembroski, G. H.

AU - Smith, A. W.

AU - Steele, D.

AU - Swordy, S. P.

AU - Toner, J. A.

AU - Valcarcel, L.

AU - Vassiliev, V. V.

AU - Wagner, R.

AU - Wakely, S. P.

AU - Ward, J. E.

AU - Weekes, T. C.

AU - Weinstein, A.

AU - White, R. J.

AU - Williams, D. A.

AU - Wissel, S. A.

AU - Wood, M.

AU - Zitzer, B.

PY - 2008/6

Y1 - 2008/6

N2 - LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy γ-rays. The system was observed over several orbital cycles (between 2006 September and 2007 February) with the VERITAS array of imaging air Cerenkov telescopes. A signal of γ-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Γ = 2.40 +/- 0.16stat+/- 0.2sys and a flux above 300 GeV corresponding to 15%-20% of the flux from the Crab Nebula....

AB - LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy γ-rays. The system was observed over several orbital cycles (between 2006 September and 2007 February) with the VERITAS array of imaging air Cerenkov telescopes. A signal of γ-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Γ = 2.40 +/- 0.16stat+/- 0.2sys and a flux above 300 GeV corresponding to 15%-20% of the flux from the Crab Nebula....

U2 - 10.1086/587736

DO - 10.1086/587736

M3 - Article

JO - The Astrophysical Journal

JF - The Astrophysical Journal

ER -

VERITAS Observations of the γ-Ray Binary LS I +61 303

Abstract

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