A Very High Energy γ-Ray Survey toward the Cygnus Region of the Galaxy

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dc.contributor.author Santander, Marcos
dc.date.accessioned 2019-06-17T21:17:07Z
dc.date.available 2019-06-17T21:17:07Z
dc.date.issued 2018-07-12
dc.identifier.citation Abeysekara, A.U., et al. (2018): A Very High Energy γ-Ray Survey toward the Cygnus Region of the Galaxy. The Astrophysical Journal, 861(1). DOI: https://doi.org/10.3847/1538-4357/aac4a2 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5784
dc.description.abstract We present results from deep observations toward the Cygnus region using 300 hr of very high energy (VHE) γ-ray data taken with the VERITAS Cerenkov telescope array and over 7 yr of high-energy γ-ray data taken with the Fermi satellite at an energy above 1 GeV. As the brightest region of diffuse γ-ray emission in the northern sky, the Cygnus region provides a promising area to probe the origins of cosmic rays. We report the identification of a potential Fermi-LAT counterpart to VER J2031+415 (TeV J2032+4130) and resolve the extended VHE source VER J2019+368 into two source candidates (VER J2018+367* and VER J2020+368*) and characterize their energy spectra. The Fermi-LAT morphology of 3FGL J2021.0+4031e (the Gamma Cygni supernova remnant) was examined, and a region of enhanced emission coincident with VER J2019+407 was identified and jointly fit with the VERITAS data. By modeling 3FGL J2015.6+3709 as two sources, one located at the location of the pulsar wind nebula CTB 87 and one at the quasar QSO J2015+371, a continuous spectrum from 1 GeV to 10 TeV was extracted for VER J2016+371 (CTB 87). An additional 71 locations coincident with Fermi-LAT sources and other potential objects of interest were tested for VHE γ-ray emission, with no emission detected and upper limits on the differential flux placed at an average of 2.3% of the Crab Nebula flux. We interpret these observations in a multiwavelength context and present the most detailed γ-ray view of the region to date. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject acceleration of particles en_US
dc.subject cosmic rays: general en_US
dc.subject ISM: supernova remnants en_US
dc.title A Very High Energy γ-Ray Survey toward the Cygnus Region of the Galaxy en_US
dc.type text en_US

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