Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS

V. A. Acciar, M. Beilicke, G. Blaylock, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, O. Celik, A. Cesarini, L. Ciupik, P. Cogan, P. Colin, W. Cui, M. K. Daniel, C. Duke, T. Ergin, A. D. Falcone, S. J. Fegan, J. P. Finley, G. FinneganP. Fortin, L. F. Fortson, K. Gibbs, G. H. Gillanders, J. Grube, R. Guenette, G. Gyuk, D. Hanna, E. Hays, J. Holder, D. Horan, S. B. Hughes, M. C. Hui, T. B. Humensky, A. Imran, P. Kaaret, M. Kertzman, 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, 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, A. Syson, J. A. Toner, L. Valcarcel, V. V. Vassiliev, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, R. J. White, D. A. Williams, S. A. Wissel, M. D. Wood, B. Zitzer

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV γ-rays. Here we report the detection of γ-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cerenkov telescope array and discuss its correlation with the X-ray emission. The γ-ray emission is measured to be pointlike with an intrinsic source radius less than 4.5′. The differential energy spectrum is fitted well by a power-law function: dΦ/dE = (7.4 ± 1.3stat ± 1.5sys)(£/TeV) (-2.31±0.17stat±0.2sys)10-9 m-2 s-1 TeV-1. We show strong evidence for a year-scale correlation between the γ-ray flux reported by TeV experiments and the X-ray emission measured by the ASM RXTE observatory, and discuss the possible short-timescale variability. These results imply that the γ-ray emission from M87 is more likely associated with the core of the galaxy than with other bright X-ray features in the jet.

Original languageEnglish (US)
Pages (from-to)397-403
Number of pages7
JournalAstrophysical Journal
Volume679
Issue number1
DOIs
StatePublished - May 20 2008

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rays
gamma rays
galaxies
x rays
X Ray Timing Explorer
radio wave
radio waves
radio galaxies
active galactic nuclei
observatories
power law
energy spectra
observatory
telescopes
radio
timescale
radii
energy
experiment

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Acciar, V. A., Beilicke, M., Blaylock, G., Bradbury, S. M., Buckley, J. H., Bugaev, V., ... Zitzer, B. (2008). Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS. Astrophysical Journal, 679(1), 397-403. https://doi.org/10.1086/587458
Acciar, V. A. ; Beilicke, M. ; Blaylock, G. ; Bradbury, S. M. ; Buckley, J. H. ; Bugaev, V. ; Butt, Y. ; Celik, O. ; Cesarini, A. ; Ciupik, L. ; Cogan, P. ; Colin, P. ; Cui, W. ; Daniel, M. K. ; Duke, C. ; Ergin, T. ; Falcone, A. D. ; Fegan, S. J. ; Finley, J. P. ; Finnegan, G. ; Fortin, P. ; Fortson, L. F. ; Gibbs, K. ; Gillanders, G. H. ; Grube, J. ; Guenette, R. ; Gyuk, G. ; Hanna, D. ; Hays, E. ; Holder, J. ; Horan, D. ; Hughes, S. B. ; Hui, M. C. ; Humensky, T. B. ; Imran, A. ; Kaaret, P. ; Kertzman, M. ; 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. ; 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. ; Syson, A. ; Toner, J. A. ; Valcarcel, L. ; Vassiliev, V. V. ; Wakely, S. P. ; Ward, J. E. ; Weekes, T. C. ; Weinstein, A. ; White, R. J. ; Williams, D. A. ; Wissel, S. A. ; Wood, M. D. ; Zitzer, B. / Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS. In: Astrophysical Journal. 2008 ; Vol. 679, No. 1. pp. 397-403.
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abstract = "The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV γ-rays. Here we report the detection of γ-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cerenkov telescope array and discuss its correlation with the X-ray emission. The γ-ray emission is measured to be pointlike with an intrinsic source radius less than 4.5′. The differential energy spectrum is fitted well by a power-law function: dΦ/dE = (7.4 ± 1.3stat ± 1.5sys)(£/TeV) (-2.31±0.17stat±0.2sys)10-9 m-2 s-1 TeV-1. We show strong evidence for a year-scale correlation between the γ-ray flux reported by TeV experiments and the X-ray emission measured by the ASM RXTE observatory, and discuss the possible short-timescale variability. These results imply that the γ-ray emission from M87 is more likely associated with the core of the galaxy than with other bright X-ray features in the jet.",
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Acciar, VA, Beilicke, M, Blaylock, G, Bradbury, SM, Buckley, JH, Bugaev, V, Butt, Y, Celik, O, Cesarini, A, Ciupik, L, Cogan, P, Colin, P, Cui, W, Daniel, MK, Duke, C, Ergin, T, Falcone, AD, Fegan, SJ, Finley, JP, Finnegan, G, Fortin, P, Fortson, LF, Gibbs, K, Gillanders, GH, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Hays, E, Holder, J, Horan, D, Hughes, SB, Hui, MC, Humensky, TB, Imran, A, Kaaret, P, Kertzman, M, 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, Pohl, M, Quinn, J, Ragan, K, Reynolds, PT, Rose, HJ, Schroedter, M, Sembroski, GH, Smith, AW, Steele, D, Swordy, SP, Syson, A, Toner, JA, Valcarcel, L, Vassiliev, VV, Wakely, SP, Ward, JE, Weekes, TC, Weinstein, A, White, RJ, Williams, DA, Wissel, SA, Wood, MD & Zitzer, B 2008, 'Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS', Astrophysical Journal, vol. 679, no. 1, pp. 397-403. https://doi.org/10.1086/587458

Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS. / Acciar, V. A.; Beilicke, M.; Blaylock, G.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Butt, Y.; Celik, O.; Cesarini, A.; Ciupik, L.; Cogan, P.; Colin, P.; Cui, W.; Daniel, M. K.; Duke, C.; Ergin, T.; Falcone, A. D.; Fegan, S. J.; Finley, J. P.; Finnegan, G.; Fortin, P.; Fortson, L. F.; Gibbs, K.; Gillanders, G. H.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Hays, E.; Holder, J.; Horan, D.; Hughes, S. B.; Hui, M. C.; Humensky, T. B.; Imran, A.; Kaaret, P.; Kertzman, M.; 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.; 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.; Syson, A.; Toner, J. A.; Valcarcel, L.; Vassiliev, V. V.; Wakely, S. P.; Ward, J. E.; Weekes, T. C.; Weinstein, A.; White, R. J.; Williams, D. A.; Wissel, S. A.; Wood, M. D.; Zitzer, B.

In: Astrophysical Journal, Vol. 679, No. 1, 20.05.2008, p. 397-403.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS

AU - Acciar, V. A.

AU - Beilicke, M.

AU - Blaylock, G.

AU - Bradbury, S. M.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Butt, Y.

AU - Celik, O.

AU - Cesarini, A.

AU - Ciupik, L.

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 - Finnegan, G.

AU - Fortin, P.

AU - Fortson, L. F.

AU - Gibbs, K.

AU - Gillanders, G. H.

AU - Grube, J.

AU - Guenette, R.

AU - Gyuk, G.

AU - Hanna, D.

AU - Hays, E.

AU - Holder, J.

AU - Horan, D.

AU - Hughes, S. B.

AU - Hui, M. C.

AU - Humensky, T. B.

AU - Imran, A.

AU - Kaaret, P.

AU - Kertzman, M.

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 - 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 - Syson, A.

AU - Toner, J. A.

AU - Valcarcel, L.

AU - Vassiliev, V. V.

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. D.

AU - Zitzer, B.

PY - 2008/5/20

Y1 - 2008/5/20

N2 - The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV γ-rays. Here we report the detection of γ-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cerenkov telescope array and discuss its correlation with the X-ray emission. The γ-ray emission is measured to be pointlike with an intrinsic source radius less than 4.5′. The differential energy spectrum is fitted well by a power-law function: dΦ/dE = (7.4 ± 1.3stat ± 1.5sys)(£/TeV) (-2.31±0.17stat±0.2sys)10-9 m-2 s-1 TeV-1. We show strong evidence for a year-scale correlation between the γ-ray flux reported by TeV experiments and the X-ray emission measured by the ASM RXTE observatory, and discuss the possible short-timescale variability. These results imply that the γ-ray emission from M87 is more likely associated with the core of the galaxy than with other bright X-ray features in the jet.

AB - The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV γ-rays. Here we report the detection of γ-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cerenkov telescope array and discuss its correlation with the X-ray emission. The γ-ray emission is measured to be pointlike with an intrinsic source radius less than 4.5′. The differential energy spectrum is fitted well by a power-law function: dΦ/dE = (7.4 ± 1.3stat ± 1.5sys)(£/TeV) (-2.31±0.17stat±0.2sys)10-9 m-2 s-1 TeV-1. We show strong evidence for a year-scale correlation between the γ-ray flux reported by TeV experiments and the X-ray emission measured by the ASM RXTE observatory, and discuss the possible short-timescale variability. These results imply that the γ-ray emission from M87 is more likely associated with the core of the galaxy than with other bright X-ray features in the jet.

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JO - Astrophysical Journal

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Acciar VA, Beilicke M, Blaylock G, Bradbury SM, Buckley JH, Bugaev V et al. Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS. Astrophysical Journal. 2008 May 20;679(1):397-403. https://doi.org/10.1086/587458