Journal
ASTROPHYSICAL JOURNAL
Volume 779, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/779/1/88
Keywords
acceleration of particles; binaries: general; gamma rays: stars; relativistic processes; X-rays: binaries
Categories
Funding
- U.S. Department of Energy Office of Science
- U.S. National Science Foundation
- Smithsonian Institution
- NSERC in Canada
- Science Foundation Ireland [SFI 10/RFP/AST2748]
- STFC in the U.K.
- Direct For Mathematical & Physical Scien [1307171] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1307443, 1068179, 1125897, 1206534, 0969043, 1207211] Funding Source: National Science Foundation
- Division Of Physics [1307171] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1207595, 0969529] Funding Source: National Science Foundation
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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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