VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multi-Wavelength Study
| dc.contributor.author | A. Archer | |
| dc.contributor.author | et al | |
| dc.date.accessioned | 2020-06-09T16:44:24Z | |
| dc.date.available | 2020-06-09T16:44:24Z | |
| dc.date.issued | 2020-05-06 | |
| dc.description | Authors: A. Archer, W. Benbow, R. Bird, A. Brill, M. Buchovecky, J. H. Buckley, M.T. Carini, J. L. Christiansen, A. J. Chromey, M. K. Daniel, M. Errando, A. Falcone, Q. Feng, P. Fortin, L. Fortson, A. Furniss, A. Gent, M. Georganopoulos, G. H. Gillanders, C. Giuri, O. Gueta, D. Hanna, T. Hassan, O. Hervet, J. Holder, G. Hughes, T. B. Humensky, P. Kaaret, M. Kertzman, D. Kieda, F. Krennrich, M. J. Lang, T. T.Y. Lin, M. L. Lister, M. Lundy, G. Maier, E. T. Meyer, P. Moriarty, R. Mukherjee, D. Nieto, M. Nievas-Rosillo, S. O'Brien, R. A. Ong, K. Pfrang, M. Pohl, R. R. Prado, E. Pueschel, J. Quinn, K. Ragan, K. Ramirez, P. T. Reynolds, D. Ribeiro, G. T. Richards, E. Roache, C. Rulten, J. L. Ryan, A. Sadun, M. Santander, S. S. Scott, G. H. Sembroski, K. Shahinyan, R. Shang, B. Stevenson, V. V. Vassiliev, S. P. Wakely, A. Weinstein, P. Wilcox, A. Wilhelm, D. A. Williams, T. J Williamson | |
| dc.description.abstract | The radio source 3C 264, hosted by the giant elliptical galaxy NGC 3862, was observed with VERITAS between February 2017 and May 2019. These deep observations resulted in the discovery of very-high-energy (VHE; E >100 GeV) γ-ray emission from this active galaxy. An analysis of ∼57 hours of quality-selected live time yields a detection at the position of the source, corresponding to a statistical significance of 7.8 standard deviations above background. The observed VHE flux is variable on monthly time scales, with an elevated flux seen in 2018 observations. The VHE emission during this elevated state is well-characterized by a power-law spectrum with a photon index Γ=2.20±0.27 and flux F(>315 GeV) = (7.6±1.2stat±2.3syst)×10⁻¹³ cm⁻² s⁻¹, or approximately 0.7% of the Crab Nebula flux above the same threshold. 3C 264 (z=0.0217) is the most distant radio galaxy detected at VHE, and the elevated state is thought to be similar to that of the famously outbursting jet in M 87. Consequently, extensive contemporaneous multi-wavelength data were acquired in 2018 at the time of the VHE high state. An analysis of these data, including VLBA, VLA, HST, Chandra and Swift observations in addition to the VERITAS data, is presented, along with a discussion of the resulting spectral energy distribution. | en_US |
| dc.description.sponsorship | This research is supported by grants from the U.S. Department of Energy Office of Science, the U.S. National Science Foundation and the Smithsonian Institution, and by NSERC in Canada. This research used resources provided by the Open Science Grid, which is supported by the National Science Foundation and the U.S. Department of Energy’s Office of Science, and resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE-AC02-05CH11231. We acknowledge the excellent work of the technical support staff at the Fred Lawrence Whipple Observatory and at the collaborating institutions in the construction and operation of the instrument. E.T. Meyer acknowledges the support of HST grant GO-14159. | en_US |
| dc.description.uri | https://arxiv.org/abs/2005.03110 | en_US |
| dc.format.extent | 19 pages | en_US |
| dc.genre | journal articles preprints | en_US |
| dc.identifier | doi:10.13016/m2nbja-npl7 | |
| dc.identifier.citation | A. Archer et al., VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multi-Wavelength Study, Astrophysical Journal, https://arxiv.org/abs/2005.03110 | en_US |
| dc.identifier.uri | http://hdl.handle.net/11603/18848 | |
| dc.language.iso | en_US | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology | |
| dc.relation.ispartof | UMBC Physics Department | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.title | VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multi-Wavelength Study | en_US |
| dc.type | Text | en_US |