VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multi-Wavelength Study
| Autor: | A. Brill, Alasdair E. Gent, James Ryan, Manel Errando, E. T. Meyer, Gordon T. Richards, Olivier Hervet, M. Kertzman, E. Roache, A. Archer, T. T.Y. Lin, K. Ragan, R. A. Ong, S. O'Brien, B. Stevenson, D. S. Hanna, G. Hughes, Wystan Benbow, P. Moriarty, Matthew L. Lister, C. B. Rulten, M. Lundy, K. Ramirez, Karlen Shahinyan, T. J. Williamson, Tarek M. Hassan, A. Wilhelm, David Kieda, Daniel Nieto, M. Nievas-Rosillo, A. C. Sadun, Jodi Christiansen, Jamie Holder, Marcos Santander, P. T. Reynolds, K. Pfrang, John L. Quinn, D. Ribeiro, R. Shang, M. J. Lang, Gernot Maier, A. D. Falcone, A. Weinstein, M. Pohl, S. P. Wakely, R. R. Prado, M. K. Daniel, P. Fortin, Ralph Bird, David A. Williams, Orel Gueta, P. Wilcox, J. H. Buckley, S. S. Scott, A. J. Chromey, Michael T. Carini, F. Krennrich, M. Georganopoulos, Reshmi Mukherjee, C. Giuri, Q. Feng, G. H. Gillanders, T. B. Humensky, P. Kaaret, Lucy Fortson, M. Buchovecky, G. H. Sembroski, E. Pueschel, Vladimir Vassiliev, Amy Furniss |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Radio galaxy atmosphere [Cherenkov counter] Astrophysics cosmic background radiation power spectrum 01 natural sciences law.invention Astrophysical jet law pixel ultraviolet black hole optical dimension: 2 010303 astronomy & astrophysics Physics High Energy Astrophysical Phenomena (astro-ph.HE) photon 2 [dimension] Elliptical galaxy Spectral energy distribution VERITAS Astrophysics - High Energy Astrophysical Phenomena Lorentz Active galactic nucleus Astrophysics::High Energy Astrophysical Phenomena radio wave [galaxy] energy spectrum FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Cherenkov counter: atmosphere VHE GLAST Telescope X-ray 0103 physical sciences structure Very Long Baseline Array Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences polarization synchrotron radiation background galaxy: radio wave Astronomy and Astrophysics Doppler effect flux Crab Nebula Space and Planetary Science gamma ray ddc:520 spectral statistical |
| Zdroj: | The astrophysical journal / 2 896(1), 41 (2020). doi:10.3847/1538-4357/ab910e |
| ISSN: | 1538-4357 |
| DOI: | 10.3204/pubdb-2020-02515 |
| Popis: | The astrophysical journal 896(1), 41 - (2020). doi:10.3847/1538-4357/ab910e 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) $\gamma$-ray emission from this active galaxy. An analysis of $\sim$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 $\Gamma = 2.20 \pm 0.27$ and flux F($>315$ GeV) = ($7.6\pm 1.2_{\mathrm stat} \pm 2.3_{\mathrm syst})\times 10^{-13}$ 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. Published by Univ.8743, Chicago, Ill. [u.a.] |
| Databáze: | OpenAIRE |
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