Multiwavelength observations of the TeV binary LS i +61° 303 with veritas, Fermi-LAT, and swift/XRT during a TeV outburst

E. Aliu; S. Archambault; B. Behera; K. Berger; M. Beilicke; W. Benbow; R. Bird; A. Bouvier; V. Bugaev; M. Cerruti; X. Chen; L. Ciupik; M. P. Connolly; W. Cui; J. Dumm; A. Falcone; S. Federici; Q. Feng; J. P. Finley; P. Fortin; L. Fortson; A. Furniss; N. Galante; G. H. Gillanders; S. Griffin; S. T. Griffiths; J. Grube; G. Gyuk; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; P. Kaaret; M. Kertzman; Y. Khassen; D. Kieda; F. Krennrich; M. J. Lang; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; A. O Faoláin De Bhróithe; R. A. Ong; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; A. Popkow; H. Prokoph; J. Quinn; K. Ragan; J. Rajotte; G. Ratliff; P. T. Reynolds; G. T. Richards; E. Roache; G. H. Sembroski; F. Sheidaei; C. Skole; A. W. Smith; D. Staszak; I. Telezhinsky; J. Tyler; A. Varlotta; S. Vincent; S. P. Wakely; T. C. Weekes; A. Weinstein; R. Welsing; A. Zajczyk; B. Zitzer

doi:10.1088/0004-637X/779/1/88

Multiwavelength observations of the TeV binary LS i +61° 303 with veritas, Fermi-LAT, and swift/XRT during a TeV outburst

E. Aliu, S. Archambault, B. Behera, K. Berger, M. Beilicke, W. Benbow, R. Bird, A. Bouvier, V. Bugaev, M. Cerruti, X. Chen, L. Ciupik, M. P. Connolly, W. Cui, J. Dumm, A. Falcone, S. Federici, Q. Feng, J. P. Finley, P. FortinL. Fortson, A. Furniss, N. Galante, G. H. Gillanders, S. Griffin, S. T. Griffiths, J. Grube, G. Gyuk, D. Hanna, J. Holder, G. Hughes, T. B. Humensky, P. Kaaret, M. Kertzman, Y. Khassen, D. Kieda, F. Krennrich, M. J. Lang, G. Maier, P. Majumdar, S. McArthur, A. McCann, P. Moriarty, R. Mukherjee, A. O Faoláin De Bhróithe, R. A. Ong, A. N. Otte, N. Park, J. S. Perkins, M. Pohl, A. Popkow, H. Prokoph, J. Quinn, K. Ragan, J. Rajotte, G. Ratliff, P. T. Reynolds, G. T. Richards, E. Roache, G. H. Sembroski, F. Sheidaei, C. Skole, A. W. Smith, D. Staszak, I. Telezhinsky, J. Tyler, A. Varlotta, S. Vincent, S. P. Wakely, T. C. Weekes, A. Weinstein, R. Welsing, A. Zajczyk, B. Zitzer

Physics and Astronomy (Twin Cities)

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Abstract

We present the results of a multiwavelength observational campaign on the TeV binary system LS I +61°303 with the VERITAS telescope array (>200 GeV), Fermi-LAT (0.3-300 GeV), and Swift/XRT (2-10 keV). The data were taken from 2011 December through 2012 January and show a strong detection in all three wavebands. During this period VERITAS obtained 24.9 hr of quality selected livetime data in which LS I +61°303 was detected at a statistical significance of 11.9σ. These TeV observations show evidence for nightly variability in the TeV regime at a post-trial significance of 3.6σ. The combination of the simultaneously obtained TeV and X-ray fluxes do not demonstrate any evidence for a correlation between emission in the two bands. For the first time since the launch of the Fermi satellite in 2008, this TeV detection allows the construction of a detailed MeV-TeV spectral energy distribution from LS I +61°303. This spectrum shows a distinct cutoff in emission near 4 GeV, with emission seen by the VERITAS observations following a simple power-law above 200 GeV. This feature in the spectrum of LS I +61°303, obtained from overlapping observations with Fermi-LAT and VERITAS, may indicate that there are two distinct populations of accelerated particles producing the GeV and TeV emission.

Original language	English (US)
Article number	88
Journal	Astrophysical Journal
Volume	779
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/779/1/88
State	Published - Dec 10 2013

Keywords

X-rays: binaries
acceleration of particles
binaries: general
gamma rays: stars
relativistic processes

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Aliu, E., Archambault, S., Behera, B., Berger, K., Beilicke, M., Benbow, W., Bird, R., Bouvier, A., Bugaev, V., Cerruti, M., Chen, X., Ciupik, L., Connolly, M. P., Cui, W., Dumm, J., Falcone, A., Federici, S., Feng, Q., Finley, J. P., ... Zitzer, B. (2013). Multiwavelength observations of the TeV binary LS i +61° 303 with veritas, Fermi-LAT, and swift/XRT during a TeV outburst. Astrophysical Journal, 779(1), Article 88. https://doi.org/10.1088/0004-637X/779/1/88

Aliu, E, Archambault, S, Behera, B, Berger, K, Beilicke, M, Benbow, W, Bird, R, Bouvier, A, Bugaev, V, Cerruti, M, Chen, X, Ciupik, L, Connolly, MP, Cui, W, Dumm, J, Falcone, A, Federici, S, Feng, Q, Finley, JP, Fortin, P, Fortson, L, Furniss, A, Galante, N, Gillanders, GH, Griffin, S, Griffiths, ST, Grube, J, Gyuk, G, Hanna, D, Holder, J, Hughes, G, Humensky, TB, Kaaret, P, Kertzman, M, Khassen, Y, Kieda, D, Krennrich, F, Lang, MJ, Maier, G, Majumdar, P, McArthur, S, McCann, A, Moriarty, P, Mukherjee, R, De Bhróithe, AOF, Ong, RA, Otte, AN, Park, N, Perkins, JS, Pohl, M, Popkow, A, Prokoph, H, Quinn, J, Ragan, K, Rajotte, J, Ratliff, G, Reynolds, PT, Richards, GT, Roache, E, Sembroski, GH, Sheidaei, F, Skole, C, Smith, AW, Staszak, D, Telezhinsky, I, Tyler, J, Varlotta, A, Vincent, S, Wakely, SP, Weekes, TC, Weinstein, A, Welsing, R, Zajczyk, A & Zitzer, B 2013, 'Multiwavelength observations of the TeV binary LS i +61° 303 with veritas, Fermi-LAT, and swift/XRT during a TeV outburst', Astrophysical Journal, vol. 779, no. 1, 88. https://doi.org/10.1088/0004-637X/779/1/88

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title = "Multiwavelength observations of the TeV binary LS i +61° 303 with veritas, Fermi-LAT, and swift/XRT during a TeV outburst",

abstract = "We present the results of a multiwavelength observational campaign on the TeV binary system LS I +61°303 with the VERITAS telescope array (>200 GeV), Fermi-LAT (0.3-300 GeV), and Swift/XRT (2-10 keV). The data were taken from 2011 December through 2012 January and show a strong detection in all three wavebands. During this period VERITAS obtained 24.9 hr of quality selected livetime data in which LS I +61°303 was detected at a statistical significance of 11.9σ. These TeV observations show evidence for nightly variability in the TeV regime at a post-trial significance of 3.6σ. The combination of the simultaneously obtained TeV and X-ray fluxes do not demonstrate any evidence for a correlation between emission in the two bands. For the first time since the launch of the Fermi satellite in 2008, this TeV detection allows the construction of a detailed MeV-TeV spectral energy distribution from LS I +61°303. This spectrum shows a distinct cutoff in emission near 4 GeV, with emission seen by the VERITAS observations following a simple power-law above 200 GeV. This feature in the spectrum of LS I +61°303, obtained from overlapping observations with Fermi-LAT and VERITAS, may indicate that there are two distinct populations of accelerated particles producing the GeV and TeV emission.",

keywords = "X-rays: binaries, acceleration of particles, binaries: general, gamma rays: stars, relativistic processes",

author = "E. Aliu and S. Archambault and B. Behera and K. Berger and M. Beilicke and W. Benbow and R. Bird and A. Bouvier and V. Bugaev and M. Cerruti and X. Chen and L. Ciupik and Connolly, {M. P.} and W. Cui and J. Dumm and A. Falcone and S. Federici and Q. Feng and Finley, {J. P.} and P. Fortin and L. Fortson and A. Furniss and N. Galante and Gillanders, {G. H.} and S. Griffin and Griffiths, {S. T.} and J. Grube and G. Gyuk and D. Hanna and J. Holder and G. Hughes and Humensky, {T. B.} and P. Kaaret and M. Kertzman and Y. Khassen and D. Kieda and F. Krennrich and Lang, {M. J.} and G. Maier and P. Majumdar and S. McArthur and A. McCann and P. Moriarty and R. Mukherjee and {De Bhr{\'o}ithe}, {A. O Faol{\'a}in} and Ong, {R. A.} and Otte, {A. N.} and N. Park and Perkins, {J. S.} and M. Pohl and A. Popkow and H. Prokoph and J. Quinn and K. Ragan and J. Rajotte and G. Ratliff and Reynolds, {P. T.} and Richards, {G. T.} and E. Roache and Sembroski, {G. H.} and F. Sheidaei and C. Skole and Smith, {A. W.} and D. Staszak and I. Telezhinsky and J. Tyler and A. Varlotta and S. Vincent and Wakely, {S. P.} and Weekes, {T. C.} and A. Weinstein and R. Welsing and A. Zajczyk and B. Zitzer",

year = "2013",

month = dec,

day = "10",

doi = "10.1088/0004-637X/779/1/88",

language = "English (US)",

volume = "779",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

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TY - JOUR

T1 - Multiwavelength observations of the TeV binary LS i +61° 303 with veritas, Fermi-LAT, and swift/XRT during a TeV outburst

AU - Aliu, E.

AU - Archambault, S.

AU - Behera, B.

AU - Berger, K.

AU - Beilicke, M.

AU - Benbow, W.

AU - Bird, R.

AU - Bouvier, A.

AU - Bugaev, V.

AU - Cerruti, M.

AU - Chen, X.

AU - Ciupik, L.

AU - Connolly, M. P.

AU - Cui, W.

AU - Dumm, J.

AU - Falcone, A.

AU - Federici, S.

AU - Feng, Q.

AU - Finley, J. P.

AU - Fortin, P.

AU - Fortson, L.

AU - Furniss, A.

AU - Galante, N.

AU - Gillanders, G. H.

AU - Griffin, S.

AU - Griffiths, S. T.

AU - Grube, J.

AU - Gyuk, G.

AU - Hanna, D.

AU - Holder, J.

AU - Hughes, G.

AU - Humensky, T. B.

AU - Kaaret, P.

AU - Kertzman, M.

AU - Khassen, Y.

AU - Kieda, D.

AU - Krennrich, F.

AU - Lang, M. J.

AU - Maier, G.

AU - Majumdar, P.

AU - McArthur, S.

AU - McCann, A.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - De Bhróithe, A. O Faoláin

AU - Ong, R. A.

AU - Otte, A. N.

AU - Park, N.

AU - Perkins, J. S.

AU - Pohl, M.

AU - Popkow, A.

AU - Prokoph, H.

AU - Quinn, J.

AU - Ragan, K.

AU - Rajotte, J.

AU - Ratliff, G.

AU - Reynolds, P. T.

AU - Richards, G. T.

AU - Roache, E.

AU - Sembroski, G. H.

AU - Sheidaei, F.

AU - Skole, C.

AU - Smith, A. W.

AU - Staszak, D.

AU - Telezhinsky, I.

AU - Tyler, J.

AU - Varlotta, A.

AU - Vincent, S.

AU - Wakely, S. P.

AU - Weekes, T. C.

AU - Weinstein, A.

AU - Welsing, R.

AU - Zajczyk, A.

AU - Zitzer, B.

PY - 2013/12/10

Y1 - 2013/12/10

N2 - We present the results of a multiwavelength observational campaign on the TeV binary system LS I +61°303 with the VERITAS telescope array (>200 GeV), Fermi-LAT (0.3-300 GeV), and Swift/XRT (2-10 keV). The data were taken from 2011 December through 2012 January and show a strong detection in all three wavebands. During this period VERITAS obtained 24.9 hr of quality selected livetime data in which LS I +61°303 was detected at a statistical significance of 11.9σ. These TeV observations show evidence for nightly variability in the TeV regime at a post-trial significance of 3.6σ. The combination of the simultaneously obtained TeV and X-ray fluxes do not demonstrate any evidence for a correlation between emission in the two bands. For the first time since the launch of the Fermi satellite in 2008, this TeV detection allows the construction of a detailed MeV-TeV spectral energy distribution from LS I +61°303. This spectrum shows a distinct cutoff in emission near 4 GeV, with emission seen by the VERITAS observations following a simple power-law above 200 GeV. This feature in the spectrum of LS I +61°303, obtained from overlapping observations with Fermi-LAT and VERITAS, may indicate that there are two distinct populations of accelerated particles producing the GeV and TeV emission.

AB - We present the results of a multiwavelength observational campaign on the TeV binary system LS I +61°303 with the VERITAS telescope array (>200 GeV), Fermi-LAT (0.3-300 GeV), and Swift/XRT (2-10 keV). The data were taken from 2011 December through 2012 January and show a strong detection in all three wavebands. During this period VERITAS obtained 24.9 hr of quality selected livetime data in which LS I +61°303 was detected at a statistical significance of 11.9σ. These TeV observations show evidence for nightly variability in the TeV regime at a post-trial significance of 3.6σ. The combination of the simultaneously obtained TeV and X-ray fluxes do not demonstrate any evidence for a correlation between emission in the two bands. For the first time since the launch of the Fermi satellite in 2008, this TeV detection allows the construction of a detailed MeV-TeV spectral energy distribution from LS I +61°303. This spectrum shows a distinct cutoff in emission near 4 GeV, with emission seen by the VERITAS observations following a simple power-law above 200 GeV. This feature in the spectrum of LS I +61°303, obtained from overlapping observations with Fermi-LAT and VERITAS, may indicate that there are two distinct populations of accelerated particles producing the GeV and TeV emission.

KW - X-rays: binaries

KW - acceleration of particles

KW - binaries: general

KW - gamma rays: stars

KW - relativistic processes

UR - http://www.scopus.com/inward/record.url?scp=84889043064&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84889043064&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/779/1/88

DO - 10.1088/0004-637X/779/1/88

M3 - Article

AN - SCOPUS:84889043064

SN - 0004-637X

VL - 779

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 88

ER -

Multiwavelength observations of the TeV binary LS i +61° 303 with veritas, Fermi-LAT, and swift/XRT during a TeV outburst

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Keywords

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