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

Research output: Contribution to journalArticle

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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 ± 0.16stat ± 0.2sys and a flux above 300 GeV corresponding to 15%-20% of the flux from the Crab Nebula.

Original languageEnglish (US)
Pages (from-to)1427-1432
Number of pages6
JournalAstrophysical Journal
Volume679
Issue number2
DOIs
StatePublished - Jun 1 2008

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rays
energy
Crab nebula
orbitals
cycles
crab
power law
standard deviation
energy spectra
air
telescopes
photons
x rays
index

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Acciari, V. A., Beilicke, M., Blaylock, G., Bradbury, S. M., Buckley, J. H., Bugaev, V., ... Zitzer, B. (2008). Veritas observations of the γ-ray binary LS i +61 303. Astrophysical Journal, 679(2), 1427-1432. https://doi.org/10.1086/587736
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. ; Fegan, S. J. ; Finley, J. P. ; Fortin, P. ; Fortson, L. F. ; Gall, D. ; Gibbs, K. ; Gillanders, G. H. ; Grube, J. ; Guenette, R. ; Hanna, D. ; Hays, E. ; Holder, J. ; Horan, D. ; Hughes, S. B. ; Hui, C. M. ; Humensky, T. B. ; Kaaret, P. ; Kieda, D. B. ; Kildea, J. ; Konopelko, A. ; Krawczynski, H. ; Krennrich, F. ; Lang, M. J. ; Lebohec, S. ; Lee, K. ; Maier, G. ; Mccann, A. ; Mccutcheon, M. ; Millis, J. ; Moriarty, P. ; Mukherjee, R. ; Nagai, T. ; Ong, R. A. ; Pandel, D. ; Perkins, J. S. ; Pizlo, F. ; Pohl, M. ; Quinn, J. ; Ragan, K. ; Reynolds, P. T. ; Rose, H. J. ; Schroedter, M. ; Sembroski, G. H. ; Smith, A. W. ; Steele, D. ; Swordy, S. P. ; Toner, J. A. ; Valcarcel, L. ; Vassiliev, V. V. ; Wagner, R. ; Wakely, S. P. ; Ward, J. E. ; Weekes, T. C. ; Weinstein, A. ; White, R. J. ; Williams, D. A. ; Wissel, S. A. ; Wood, M. ; Zitzer, B. / Veritas observations of the γ-ray binary LS i +61 303. In: Astrophysical Journal. 2008 ; Vol. 679, No. 2. pp. 1427-1432.
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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 ± 0.16stat ± 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",
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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', Astrophysical Journal, vol. 679, no. 2, pp. 1427-1432. https://doi.org/10.1086/587736

Veritas observations of the γ-ray binary LS i +61 303. / 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.; Fegan, S. J.; Finley, J. P.; Fortin, P.; Fortson, L. F.; Gall, D.; Gibbs, K.; Gillanders, G. H.; Grube, J.; Guenette, R.; Hanna, D.; Hays, E.; Holder, J.; Horan, D.; Hughes, S. B.; Hui, C. M.; Humensky, T. B.; Kaaret, P.; Kieda, D. B.; Kildea, J.; Konopelko, A.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; Lebohec, S.; Lee, K.; Maier, G.; Mccann, A.; Mccutcheon, M.; Millis, J.; Moriarty, P.; Mukherjee, R.; Nagai, T.; Ong, R. A.; Pandel, D.; Perkins, J. S.; Pizlo, F.; Pohl, M.; Quinn, J.; Ragan, K.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Smith, A. W.; Steele, D.; Swordy, S. P.; Toner, J. A.; Valcarcel, L.; Vassiliev, V. V.; Wagner, R.; Wakely, S. P.; Ward, J. E.; Weekes, T. C.; Weinstein, A.; White, R. J.; Williams, D. A.; Wissel, S. A.; Wood, M.; Zitzer, B.

In: Astrophysical Journal, Vol. 679, No. 2, 01.06.2008, p. 1427-1432.

Research output: Contribution to journalArticle

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 - 2008/6/1

Y1 - 2008/6/1

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.

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DO - 10.1086/587736

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Acciari VA, Beilicke M, Blaylock G, Bradbury SM, Buckley JH, Bugaev V et al. Veritas observations of the γ-ray binary LS i +61 303. Astrophysical Journal. 2008 Jun 1;679(2):1427-1432. https://doi.org/10.1086/587736