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

A. U. Abeysekara; S. Archambault; A. Archer; W. Benbow; R. Bird; R. Brose; M. Buchovecky; J. H. Buckley; V. Bugaev; M. Cerruti; M. P. Connolly; W. Cui; A. Falcone; Q. Feng; J. P. Finley; H. Fleischhack; L. Fortson; A. Furniss; G. H. Gillanders; S. Griffin; J. Grube; M. Hütten; D. Hanna; O. Hervet; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; D. Kieda; M. Krause; F. Krennrich; S. Kumar; M. J. Lang; G. Maier; S. McArthur; P. Moriarty; R. Mukherjee; D. Nieto; S. O'Brien; R. A. Ong; A. N. Otte; N. Park; A. Petrashyk; M. Pohl; A. Popkow; E. Pueschel; J. Quinn

doi:10.3847/1538-4365/aa8d76

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

A. U. Abeysekara, S. Archambault, A. Archer, W. Benbow, R. Bird, R. Brose, M. Buchovecky, J. H. Buckley, V. Bugaev, M. Cerruti, M. P. Connolly, W. Cui, A. Falcone, Q. Feng, J. P. Finley, H. Fleischhack, L. Fortson, A. Furniss, G. H. Gillanders, S. GriffinJ. Grube, M. Hütten, D. Hanna, O. Hervet, J. Holder, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, M. Kertzman, D. Kieda, M. Krause, F. Krennrich, S. Kumar, M. J. Lang, G. Maier, S. McArthur, P. Moriarty, R. Mukherjee, D. Nieto, S. O'Brien, R. A. Ong, A. N. Otte, N. Park, A. Petrashyk, M. Pohl, A. Popkow, E. Pueschel, J. Quinn

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

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 )10^-2 1 1. The integrated Fermi-LAT flux from 1 to 100 GeV during the VERITAS detection is (4.1 ±0.8× 10 cm^-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^-9 cm^-2s ^-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.

Original language	English (US)
Article number	7
Journal	Astrophysical Journal, Supplement Series
Volume	233
Issue number	1
DOIs	https://doi.org/10.3847/1538-4365/aa8d76
State	Published - Nov 2017

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© 2017. The American Astronomical Society. All rights reserved.

Keywords

Galaxies: individual (RGB J2243+203)

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Abeysekara, A. U., Archambault, S., Archer, A., Benbow, W., Bird, R., Brose, R., Buchovecky, M., Buckley, J. H., Bugaev, V., Cerruti, M., Connolly, M. P., Cui, W., Falcone, A., Feng, Q., Finley, J. P., Fleischhack, H., Fortson, L., Furniss, A., Gillanders, G. H., ... Quinn, J. (2017). Discovery of Very-high-energy Emission from RGB J2243+203 and Derivation of Its Redshift Upper Limit. Astrophysical Journal, Supplement Series, 233(1), Article 7. https://doi.org/10.3847/1538-4365/aa8d76

Abeysekara, AU, Archambault, S, Archer, A, Benbow, W, Bird, R, Brose, R, Buchovecky, M, Buckley, JH, Bugaev, V, Cerruti, M, Connolly, MP, Cui, W, Falcone, A, Feng, Q, Finley, JP, Fleischhack, H, Fortson, L, Furniss, A, Gillanders, GH, Griffin, S, Grube, J, Hütten, M, Hanna, D, Hervet, O, Holder, J, Humensky, TB, Johnson, CA, Kaaret, P, Kar, P, Kelley-Hoskins, N, Kertzman, M, Kieda, D, Krause, M, Krennrich, F, Kumar, S, Lang, MJ, Maier, G, McArthur, S, Moriarty, P, Mukherjee, R, Nieto, D, O'Brien, S, Ong, RA, Otte, AN, Park, N, Petrashyk, A, Pohl, M, Popkow, A, Pueschel, E & Quinn, J 2017, 'Discovery of Very-high-energy Emission from RGB J2243+203 and Derivation of Its Redshift Upper Limit', Astrophysical Journal, Supplement Series, vol. 233, no. 1, 7. https://doi.org/10.3847/1538-4365/aa8d76

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

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 )10-2 1 1. The integrated Fermi-LAT flux from 1 to 100 GeV during the VERITAS detection is (4.1 ±0.8× 10 cm-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× 10-9 cm-2s -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.",

keywords = "Galaxies: individual (RGB J2243+203)",

author = "Abeysekara, {A. U.} and S. Archambault and A. Archer and W. Benbow and R. Bird and R. Brose and M. Buchovecky and Buckley, {J. H.} and V. Bugaev and M. Cerruti and Connolly, {M. P.} and W. Cui and A. Falcone and Q. Feng and Finley, {J. P.} and H. Fleischhack and L. Fortson and A. Furniss and Gillanders, {G. H.} and S. Griffin and J. Grube and M. H{\"u}tten and D. Hanna and O. Hervet and J. Holder and Humensky, {T. B.} and Johnson, {C. A.} and P. Kaaret and P. Kar and N. Kelley-Hoskins and M. Kertzman and D. Kieda and M. Krause and F. Krennrich and S. Kumar and Lang, {M. J.} and G. Maier and S. McArthur and P. Moriarty and R. Mukherjee and D. Nieto and S. O'Brien and Ong, {R. A.} and Otte, {A. N.} and N. Park and A. Petrashyk and M. Pohl and A. Popkow and E. Pueschel and J. Quinn",

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month = nov,

doi = "10.3847/1538-4365/aa8d76",

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T1 - Discovery of Very-high-energy Emission from RGB J2243+203 and Derivation of Its Redshift Upper Limit

AU - Abeysekara, A. U.

AU - Archambault, S.

AU - Archer, A.

AU - Benbow, W.

AU - Bird, R.

AU - Brose, R.

AU - Buchovecky, M.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Cerruti, M.

AU - Connolly, M. P.

AU - Cui, W.

AU - Falcone, A.

AU - Feng, Q.

AU - Finley, J. P.

AU - Fleischhack, H.

AU - Fortson, L.

AU - Furniss, A.

AU - Gillanders, G. H.

AU - Griffin, S.

AU - Grube, J.

AU - Hütten, M.

AU - Hanna, D.

AU - Hervet, O.

AU - Holder, J.

AU - Humensky, T. B.

AU - Johnson, C. A.

AU - Kaaret, P.

AU - Kar, P.

AU - Kelley-Hoskins, N.

AU - Kertzman, M.

AU - Kieda, D.

AU - Krause, M.

AU - Krennrich, F.

AU - Kumar, S.

AU - Lang, M. J.

AU - Maier, G.

AU - McArthur, S.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - Nieto, D.

AU - O'Brien, S.

AU - Ong, R. A.

AU - Otte, A. N.

AU - Park, N.

AU - Petrashyk, A.

AU - Pohl, M.

AU - Popkow, A.

AU - Pueschel, E.

AU - Quinn, J.

PY - 2017/11

Y1 - 2017/11

N2 - 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 )10-2 1 1. The integrated Fermi-LAT flux from 1 to 100 GeV during the VERITAS detection is (4.1 ±0.8× 10 cm-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× 10-9 cm-2s -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.

AB - 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 )10-2 1 1. The integrated Fermi-LAT flux from 1 to 100 GeV during the VERITAS detection is (4.1 ±0.8× 10 cm-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× 10-9 cm-2s -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.

KW - Galaxies: individual (RGB J2243+203)

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ER -

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

Abstract

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