Evidence for Long-Term Gamma-Ray and X-Ray Variability from the Unidentified TeV Source HESS J0632+057

V. A. Acciari; E. Aliu; T. Arlen; M. Beilicke; W. Benbow; D. Boltuch; S. M. Bradbury; J. H. Buckley; V. Bugaev; K. Byrum; A. Cannon; A. Cesarini; A. Cesarini; Y. C. Chow; L. Ciupik; P. Cogan; R. Dickherber; C. Duke; T. Ergin; A. Falcone; S. J. Fegan; J. P. Finley; G. Finnegan; P. Fortin; L. Fortson; A. Furniss; K. Gibbs; G. H. Gillanders; J. Grube; R. Guenette; G. Gyuk; D. Hanna; J. Holder; D. Horan; C. M. Hui; T. B. Humensky; A. Imran; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; J. Kildea; A. Konopelko; H. Krawczynski; F. Krennrich; M. J. Lang; S. LeBohec; S. LeBohec; G. Maier; A. McCann; M. McCutcheon; J. Millis; J. Millis; P. Moriarty; R. Mukherjee; R. A. Ong; A. N. Otte; D. Pandel; J. S. Perkins; D. Petry; M. Pohl; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; H. J. Rose; M. Schroedter; G. H. Sembroski; A. W. Smith; D. Steele; S. Swordy; M. Theiling; J. A. Toner; A. Varlotta; V. V. Vassiliev; S. Vincent; R. G. Wagner; S. P. Wakely; J. E. Ward; T. C. Weekes; A. Weinstein; T. Weisgarber; D. A. Williams; S. Wissel; M. Wood

doi:10.1088/0004-637X/698/2/L94

Evidence for Long-Term Gamma-Ray and X-Ray Variability from the Unidentified TeV Source HESS J0632+057

V. A. Acciari, E. Aliu, T. Arlen, M. Beilicke, W. Benbow, D. Boltuch, S. M. Bradbury, J. H. Buckley, V. Bugaev, K. Byrum, A. Cannon, A. Cesarini, A. Cesarini, Y. C. Chow, L. Ciupik, P. Cogan, R. Dickherber, C. Duke, T. Ergin, A. FalconeS. J. Fegan, J. P. Finley, G. Finnegan, P. Fortin, L. Fortson, A. Furniss, K. Gibbs, G. H. Gillanders, J. Grube, R. Guenette, G. Gyuk, D. Hanna, J. Holder, D. Horan, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, J. Kildea, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, S. LeBohec, G. Maier, A. McCann, M. McCutcheon, J. Millis, J. Millis, P. Moriarty, R. Mukherjee, R. A. Ong, A. N. Otte, D. Pandel, J. S. Perkins, D. Petry, M. Pohl, J. Quinn, K. Ragan, L. C. Reyes, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, A. W. Smith, D. Steele, S. Swordy, M. Theiling, J. A. Toner, A. Varlotta, V. V. Vassiliev, S. Vincent, R. G. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, T. Weisgarber, D. A. Williams, S. Wissel, M. Wood

Research output: Contribution to a Journal (Peer & Non Peer) › Article › peer-review

Abstract

HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested to resemble known TeV binary systems like LS I +61 303 or LS 5039. HESS J0632+057 was observed by VERITAS for 31 hr in 2006, 2008, and 2009. During these observations, no significant signal in gamma rays with energies above 1 TeV was detected from the direction of HESS J0632+057. A flux upper limit corresponding to 1.1% of the flux of the Crab Nebula has been derived from the VERITAS data. The nondetection by VERITAS excludes with a probability of 99.993% that HESS J0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observations with the Swift X-Ray Telescope reveal a factor of 1.8 ± 0.4 higher flux in the 1-10 keV range than earlier X-ray observations of HESS J0632+057. The variability in the gamma-ray and X-ray fluxes supports interpretation of the object as a gamma-ray emitting binary....

Original language	English
Journal	The Astrophysical Journal
DOIs	https://doi.org/10.1088/0004-637X/698/2/L94
Publication status	Published - Jun 2009

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10.1088/0004-637X/698/2/L94

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Acciari, V. A., Aliu, E., Arlen, T., Beilicke, M., Benbow, W., Boltuch, D., Bradbury, S. M., Buckley, J. H., Bugaev, V., Byrum, K., Cannon, A., Cesarini, A., Cesarini, A., Chow, Y. C., Ciupik, L., Cogan, P., Dickherber, R., Duke, C., Ergin, T., ... Wood, M. (2009). Evidence for Long-Term Gamma-Ray and X-Ray Variability from the Unidentified TeV Source HESS J0632+057. The Astrophysical Journal. https://doi.org/10.1088/0004-637X/698/2/L94

@article{9676579a1e564c26b60c06bcb12f1953,

title = "Evidence for Long-Term Gamma-Ray and X-Ray Variability from the Unidentified TeV Source HESS J0632+057",

abstract = "HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested to resemble known TeV binary systems like LS I +61 303 or LS 5039. HESS J0632+057 was observed by VERITAS for 31 hr in 2006, 2008, and 2009. During these observations, no significant signal in gamma rays with energies above 1 TeV was detected from the direction of HESS J0632+057. A flux upper limit corresponding to 1.1\% of the flux of the Crab Nebula has been derived from the VERITAS data. The nondetection by VERITAS excludes with a probability of 99.993\% that HESS J0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observations with the Swift X-Ray Telescope reveal a factor of 1.8 ± 0.4 higher flux in the 1-10 keV range than earlier X-ray observations of HESS J0632+057. The variability in the gamma-ray and X-ray fluxes supports interpretation of the object as a gamma-ray emitting binary....",

author = "Acciari, \{V. A.\} and E. Aliu and T. Arlen and M. Beilicke and W. Benbow and D. Boltuch and Bradbury, \{S. M.\} and Buckley, \{J. H.\} and V. Bugaev and K. Byrum and A. Cannon and A. Cesarini and A. Cesarini and Chow, \{Y. C.\} and L. Ciupik and P. Cogan and R. Dickherber and C. Duke and T. Ergin and A. Falcone and Fegan, \{S. J.\} and Finley, \{J. P.\} and G. Finnegan and P. Fortin and L. Fortson and A. Furniss and K. Gibbs and Gillanders, \{G. H.\} and J. Grube and R. Guenette and G. Gyuk and D. Hanna and J. Holder and D. Horan and Hui, \{C. M.\} and Humensky, \{T. B.\} and A. Imran and P. Kaaret and N. Karlsson and M. Kertzman and D. Kieda and J. Kildea and A. Konopelko and H. Krawczynski and F. Krennrich and Lang, \{M. J.\} and S. LeBohec and S. LeBohec and G. Maier and A. McCann and M. McCutcheon and J. Millis and J. Millis and P. Moriarty and R. Mukherjee and Ong, \{R. A.\} and Otte, \{A. N.\} and D. Pandel and Perkins, \{J. S.\} and D. Petry and M. Pohl and J. Quinn and K. Ragan and Reyes, \{L. C.\} and Reynolds, \{P. T.\} and Rose, \{H. J.\} and M. Schroedter and Sembroski, \{G. H.\} and Smith, \{A. W.\} and D. Steele and S. Swordy and M. Theiling and Toner, \{J. A.\} and A. Varlotta and Vassiliev, \{V. V.\} and S. Vincent and Wagner, \{R. G.\} and Wakely, \{S. P.\} and Ward, \{J. E.\} and Weekes, \{T. C.\} and A. Weinstein and T. Weisgarber and Williams, \{D. A.\} and S. Wissel and M. Wood",

year = "2009",

month = jun,

doi = "10.1088/0004-637X/698/2/L94",

language = "English",

journal = "The Astrophysical Journal",

}

Acciari, VA, Aliu, E, Arlen, T, Beilicke, M, Benbow, W, Boltuch, D, Bradbury, SM, Buckley, JH, Bugaev, V, Byrum, K, Cannon, A, Cesarini, A, Cesarini, A, Chow, YC, Ciupik, L, Cogan, P, Dickherber, R, Duke, C, Ergin, T, Falcone, A, Fegan, SJ, Finley, JP, Finnegan, G, Fortin, P, Fortson, L, Furniss, A, Gibbs, K, Gillanders, GH, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Horan, D, Hui, CM, Humensky, TB, Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Kildea, J, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, MJ, LeBohec, S, LeBohec, S, Maier, G, McCann, A, McCutcheon, M, Millis, J, Millis, J, Moriarty, P, Mukherjee, R, Ong, RA, Otte, AN, Pandel, D, Perkins, JS, Petry, D, Pohl, M, Quinn, J, Ragan, K, Reyes, LC, Reynolds, PT, Rose, HJ, Schroedter, M, Sembroski, GH, Smith, AW, Steele, D, Swordy, S, Theiling, M, Toner, JA, Varlotta, A, Vassiliev, VV, Vincent, S, Wagner, RG, Wakely, SP, Ward, JE, Weekes, TC, Weinstein, A, Weisgarber, T, Williams, DA, Wissel, S & Wood, M 2009, 'Evidence for Long-Term Gamma-Ray and X-Ray Variability from the Unidentified TeV Source HESS J0632+057', The Astrophysical Journal. https://doi.org/10.1088/0004-637X/698/2/L94

TY - JOUR

T1 - Evidence for Long-Term Gamma-Ray and X-Ray Variability from the Unidentified TeV Source HESS J0632+057

AU - Acciari, V. A.

AU - Aliu, E.

AU - Arlen, T.

AU - Beilicke, M.

AU - Benbow, W.

AU - Boltuch, D.

AU - Bradbury, S. M.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Byrum, K.

AU - Cannon, A.

AU - Cesarini, A.

AU - Chow, Y. C.

AU - Ciupik, L.

AU - Cogan, P.

AU - Dickherber, R.

AU - Duke, C.

AU - Ergin, T.

AU - Falcone, A.

AU - Fegan, S. J.

AU - Finley, J. P.

AU - Finnegan, G.

AU - Fortin, P.

AU - Fortson, L.

AU - Furniss, A.

AU - Gibbs, K.

AU - Gillanders, G. H.

AU - Grube, J.

AU - Guenette, R.

AU - Gyuk, G.

AU - Hanna, D.

AU - Holder, J.

AU - Horan, D.

AU - Hui, C. M.

AU - Humensky, T. B.

AU - Imran, A.

AU - Kaaret, P.

AU - Karlsson, N.

AU - Kertzman, M.

AU - Kieda, D.

AU - Kildea, J.

AU - Konopelko, A.

AU - Krawczynski, H.

AU - Krennrich, F.

AU - Lang, M. J.

AU - LeBohec, S.

AU - Maier, G.

AU - McCann, A.

AU - McCutcheon, M.

AU - Millis, J.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - Ong, R. A.

AU - Otte, A. N.

AU - Pandel, D.

AU - Perkins, J. S.

AU - Petry, D.

AU - Pohl, M.

AU - Quinn, J.

AU - Ragan, K.

AU - Reyes, L. C.

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.

AU - Theiling, M.

AU - Toner, J. A.

AU - Varlotta, A.

AU - Vassiliev, V. V.

AU - Vincent, S.

AU - Wagner, R. G.

AU - Wakely, S. P.

AU - Ward, J. E.

AU - Weekes, T. C.

AU - Weinstein, A.

AU - Weisgarber, T.

AU - Williams, D. A.

AU - Wissel, S.

AU - Wood, M.

PY - 2009/6

Y1 - 2009/6

N2 - HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested to resemble known TeV binary systems like LS I +61 303 or LS 5039. HESS J0632+057 was observed by VERITAS for 31 hr in 2006, 2008, and 2009. During these observations, no significant signal in gamma rays with energies above 1 TeV was detected from the direction of HESS J0632+057. A flux upper limit corresponding to 1.1% of the flux of the Crab Nebula has been derived from the VERITAS data. The nondetection by VERITAS excludes with a probability of 99.993% that HESS J0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observations with the Swift X-Ray Telescope reveal a factor of 1.8 ± 0.4 higher flux in the 1-10 keV range than earlier X-ray observations of HESS J0632+057. The variability in the gamma-ray and X-ray fluxes supports interpretation of the object as a gamma-ray emitting binary....

AB - HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested to resemble known TeV binary systems like LS I +61 303 or LS 5039. HESS J0632+057 was observed by VERITAS for 31 hr in 2006, 2008, and 2009. During these observations, no significant signal in gamma rays with energies above 1 TeV was detected from the direction of HESS J0632+057. A flux upper limit corresponding to 1.1% of the flux of the Crab Nebula has been derived from the VERITAS data. The nondetection by VERITAS excludes with a probability of 99.993% that HESS J0632+057 is a steady gamma-ray emitter. Contemporaneous X-ray observations with the Swift X-Ray Telescope reveal a factor of 1.8 ± 0.4 higher flux in the 1-10 keV range than earlier X-ray observations of HESS J0632+057. The variability in the gamma-ray and X-ray fluxes supports interpretation of the object as a gamma-ray emitting binary....

U2 - 10.1088/0004-637X/698/2/L94

DO - 10.1088/0004-637X/698/2/L94

M3 - Article

JO - The Astrophysical Journal

JF - The Astrophysical Journal

ER -

Evidence for Long-Term Gamma-Ray and X-Ray Variability from the Unidentified TeV Source HESS J0632+057

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