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26 April 2024

» arxiv » 2002.4119

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A decade of multi-wavelength observations of the TeV blazar 1ES 1215+303: Extreme shift of the synchrotron peak frequency and long-term optical-gamma-ray flux increase
Janeth Valverde ; Deirdre Horan ; Denis Bernard ; Stephen Fegan ; A. U. Abeysekara ; A. Archer ; W. Benbow ; R. Bird ; A. Brill ; R. Brose ; M. Buchovecky ; J. H. Buckley ; J. L. Christiansen ; W. Cui ; A. Falcone ; Q. Feng ; J. P. Finley ; L. Fortson ; A. Furniss ; A. Gent ; G. H. Gillanders ; C. Giuri ; O. Gueta ; D. Hanna ; T. Hassan ; O. Hervet ; J. Holder ; G. Hughes ; T. B. Humensky ; P. Kaaret ; N. Kelley-Hoskins ; M. Kertzman ; D. Kieda ; M. Krause ; F. Krennrich ; M. J. Lang ; G. Maier ; P. Moriarty ; R. Mukherjee ; D. Nieto ; M. Nievas-Rosillo ; S. O'Brien ; R. A. Ong ; A. N. Otte ; N. Park ; A. Petrashyk ; K. Pfrang ; A. Pichel ; M. Pohl ; R. R. Prado ; E. Pueschel ; J. Quinn ; K. Ragan ; P. T. Reynolds ; Ribeiro ; G. T. Richards ; E. Roache ; I. Sadeh ; M. Santander ; S. S. Scott ; G. H. Sembroski ; K. Shahinyan ; R. Shang ; I. Sushch ; V. V. Vassiliev ; A. Weinstein ; R. M. Wells ; P. Wilcox ; A. Wilhelm ; D. A. Williams ; T. J Williamson ; Giuliana Noto ; P. G. Edwards ; B. G. Piner ; V. Fallah Ramazani ; T. Hovatta ; J. Jormanainen ; E. Lindfors ; K. Nilsson ; L. Takalo ; Y. Y. Kovalev ; M. L. Lister ; A. B. Pushkarev ; T. Savolainen ; S. Kiehlmann ; W. Max-Moerbeck ; A. C. S. Readhead ; A. Lähteenmäki ; M. Tornikoski ;
Date:	10 Feb 2020
Abstract:	Blazars are known for their variability on a wide range of timescales at all wavelengths. Most studies of TeV gamma-ray blazars focus on short timescales, especially during flares. With a decade of observations from the Fermi-LAT and VERITAS, we present an extensive study of the long-term multi-wavelength radio-to-gamma-ray flux-density variability, with the addition of a couple of short-time radio-structure and optical polarization observations of the blazar 1ES 1215+303 (z=0.130), with a focus on its gamma-ray emission from 100 MeV to 30 TeV. Multiple strong GeV gamma-ray flares, a long-term increase in the gamma-ray and optical flux baseline and a linear correlation between these two bands are observed over the ten-year period. Typical HBL behaviors are identified in the radio morphology and broadband spectrum of the source. Three stationary features in the innermost jet are resolved by VLBA at 43.1, 22.2, and 15.3 GHz. We employ a two-component synchrotron self-Compton model to describe different flux states of the source, including the epoch during which an extreme shift in energy of the synchrotron peak frequency from infrared to soft X-rays is observed.
Source:	arXiv, 2002.4119
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