Discovery of Very-high-energy Emission from RGB J2243+203 and Derivation of Its Redshift Upper Limit

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dc.contributor.author Santander, Marcos
dc.date.accessioned 2019-06-17T20:39:49Z
dc.date.available 2019-06-17T20:39:49Z
dc.date.issued 2017-11-10 en_US
dc.identifier.citation Abeysekara, A.U., et al. (2017): Discovery of Very-high-energy Emission from RGB J2243+203 and Derivation of Its Redshift Upper Limit. The Astrophysical Journal, 233(1). DOI: https://doi.org/10.3847/1538-4365/aa8d76 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5778
dc.description.abstract Very-high-energy (VHE; > 100 GeV) gamma-ray emission from the blazar RGB J2243+203 was discovered with the VERITAS Cherenkov telescope array, during the period between 2014 December 21 and 24. The VERITAS energy spectrum from this source can be fitted by a power law with a photon index of 4.6 ± 0.5, and a flux normalization at 0.15 TeV of (6.3 ± 1.1) × 10^(-10) cm^(-2)s^(-1)TeV^(-1). The integrated Fermi-LAT flux from 1 to 100 GeV during the VERITAS detection is (4.1 ± 0.8) × 10⁻⁸cm^(-2)s^(-1), which is an order of magnitude larger than the four-year-averaged flux in the same energy range reported in the 3FGL catalog, (4.0 ± 0.1 × 10⁻⁹cm^(-2)s^(-1)). The detection with VERITAS triggered observations in the X-ray band with the Swift-XRT. However, due to scheduling constraints Swift-XRT observations were performed 67 hr after the VERITAS detection, rather than simultaneously with the VERITAS observations. The observed X-ray energy spectrum between 2 and 10 keV can be fitted with a power law with a spectral index of 2.7 ± 0.2, and the integrated photon flux in the same energy band is (3.6 ± 0.6) × 10^(-13)cm^(-2)s^(-1). EBL-model-dependent upper limits of the blazar redshift have been derived. Depending on the EBL model used, the upper limit varies in the range from z < 0.9 to z < 1.1. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject galaxies: individual (RGB J2243+203) en_US
dc.title Discovery of Very-high-energy Emission from RGB J2243+203 and Derivation of Its Redshift Upper Limit en_US
dc.type text en_US


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