MULTIWAVELENGTH OBSERVATIONS OF THE TeV BINARY LS I+61 degrees 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'Faolain de Bhroithe; 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

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MULTIWAVELENGTH OBSERVATIONS OF THE TeV BINARY LS I+61 degrees 303 WITH VERITAS, Fermi-LAT, AND Swift/XRT DURING A TeV OUTBURST

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MULTIWAVELENGTH OBSERVATIONS OF THE TeV BINARY LS I+61 degrees 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, …

The Astrophysical journal, v 779(1)

10 Dec 2013

DOI: https://doi.org/10.1088/0004-637X/779/1/88

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Abstract

Astronomy & Astrophysics

Physical Sciences

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We present the results of a multiwavelength observational campaign on the TeV binary system LS I +61 degrees 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 degrees 303 was detected at a statistical significance of 11.9 sigma. These TeV observations show evidence for nightly variability in the TeV regime at a post-trial significance of 3.6 sigma. 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 degrees 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 degrees 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.

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Title: MULTIWAVELENGTH OBSERVATIONS OF THE TeV BINARY LS I+61 degrees 303 WITH VERITAS, Fermi-LAT, AND Swift/XRT DURING A TeV OUTBURST
Creators: E. Aliu - Columbia Univ, Dept Phys, New York, NY 10027 USA
S. Archambault - McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
B. Behera - DESY, D-15738 Zeuthen, Germany
K. Berger - Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
M. Beilicke - Washington Univ, Dept Phys, St Louis, MO 63130 USA
W. Benbow - Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA
R. Bird - Univ Coll Dublin, Sch Phys, Dublin 4, Ireland
A. Bouvier - Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA
V. Bugaev - Washington Univ, Dept Phys, St Louis, MO 63130 USA
M. Cerruti - Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA
X. Chen - DESY, D-15738 Zeuthen, Germany
L. Ciupik - Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA
M. P. Connolly - Natl Univ Ireland Galway, Sch Phys, Galway, Ireland
W. Cui - Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
J. Dumm - Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
A. Falcone - Pennsylvania State University
S. Federici - DESY, D-15738 Zeuthen, Germany
Q. Feng - Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
J. P. Finley - Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
P. Fortin - Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA
L. Fortson - Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
A. Furniss - Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA
N. Galante - Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA
G. H. Gillanders - Natl Univ Ireland Galway, Sch Phys, Galway, Ireland
S. Griffin - McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
S. T. Griffiths - Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
J. Grube - Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA
G. Gyuk - Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA
D. Hanna - McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
J. Holder - Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
G. Hughes - DESY, D-15738 Zeuthen, Germany
T. B. Humensky - Columbia Univ, Dept Phys, New York, NY 10027 USA
P. Kaaret - Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
M. Kertzman - Depauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA
Y. Khassen - Univ Coll Dublin, Sch Phys, Dublin 4, Ireland
D. Kieda - Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
F. Krennrich - Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
M. J. Lang - Natl Univ Ireland Galway, Sch Phys, Galway, Ireland
G. Maier - DESY, D-15738 Zeuthen, Germany
P. Majumdar - Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
S. McArthur - Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
A. McCann - Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA
P. Moriarty - Galway Mayo Inst Technol, Dept Life & Phys Sci, Galway, Ireland
R. Mukherjee - Columbia Univ, Dept Phys, New York, NY 10027 USA
A. O'Faolain de Bhroithe - Univ Coll Dublin, Sch Phys, Dublin 4, Ireland
R. A. Ong - Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
A. N. Otte - Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
N. Park - Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
J. S. Perkins - NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
M. Pohl - DESY, D-15738 Zeuthen, Germany
A. Popkow - Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
H. Prokoph - DESY, D-15738 Zeuthen, Germany
J. Quinn - Univ Coll Dublin, Sch Phys, Dublin 4, Ireland
K. Ragan - McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
J. Rajotte - McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
G. Ratliff - Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA
P. T. Reynolds - Cork Inst Technol, Dept Appl Phys & Instrumentat, Cork, Ireland
G. T. Richards - Supreme Council Of Health
E. Roache - Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA
G. H. Sembroski - Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
F. Sheidaei - Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
C. Skole - DESY, D-15738 Zeuthen, Germany
A. W. Smith - Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
D. Staszak - McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
I. Telezhinsky - DESY, D-15738 Zeuthen, Germany
J. Tyler - McGill University
A. Varlotta - Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
S. Vincent - DESY, D-15738 Zeuthen, Germany
S. P. Wakely - Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
T. C. Weekes - Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA
A. Weinstein - Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
R. Welsing - DESY, D-15738 Zeuthen, Germany
A. Zajczyk - Washington Univ, Dept Phys, St Louis, MO 63130 USA
B. Zitzer - Argonne Natl Lab, Argonne, IL 60439 USA
Publication Details: The Astrophysical journal, v 779(1)
Publisher: Iop Publishing Ltd
Number of pages: 7
Grant note: STFC in the U.K.; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) NSERC in Canada; Natural Sciences and Engineering Research Council of Canada (NSERC) SFI 10/RFP/AST2748 / Science Foundation Ireland; European Commission U.S. Department of Energy Office of Science; United States Department of Energy (DOE) Smithsonian Institution 1068179 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) 0969043 / Division Of Physics; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) U.S. National Science Foundation; National Science Foundation (NSF)
Resource Type: Journal article
Language: English
Academic Unit: Physics
Web of Science ID: WOS:000328160100088
Scopus ID: 2-s2.0-84889043064
Other Identifier: 991019201383104721

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Collaboration types: Domestic collaboration; International collaboration
Web of Science research areas: Astronomy & Astrophysics

MULTIWAVELENGTH OBSERVATIONS OF THE TeV BINARY LS I+61 degrees 303 WITH VERITAS, Fermi-LAT, AND Swift/XRT DURING A TeV OUTBURST

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