1. A Decade of Multiwavelength Observations of the TeV Blazar 1ES 1215+303: Extreme Shift of the Synchrotron Peak Frequency and Long-term Optical–Gamma-Ray Flux Increase
- Author
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Tuomas Savolainen, S. S. Scott, K. Nilsson, A. Wilhelm, Walter Max-Moerbeck, S. O'Brien, Alasdair E. Gent, Nahee Park, A. N. Otte, K. Ragan, R. A. Ong, G. H. Sembroski, K. Pfrang, Merja Tornikoski, T. J. Williamson, Wei Cui, Sebastian Kiehlmann, R. Shang, Marita Krause, Anushka Udara Abeysekara, Philip G. Edwards, Amy Furniss, P. Kaaret, A. Pichel, Gernot Maier, Alexander B. Pushkarev, D. Horan, Anne Lähteenmäki, Jamie Holder, V. V. Vassiliev, B. G. Piner, Lucy Fortson, A. Brill, P. Moriarty, Karlen Shahinyan, Tarek M. Hassan, Denis Bernard, J. H. Buckley, G. Hughes, M. Pohl, I. Sushch, M. Kertzman, A. C. S. Readhead, J. Valverde, Robert Brose, Wystan Benbow, Q. Feng, John L. Quinn, Daniel Nieto, Stephen Fegan, M. Nievas-Rosillo, D. Ribeiro, M. Buchovecky, Giuliana Noto, T. B. Humensky, Jenni Jormanainen, F. Krennrich, Talvikki Hovatta, M. J. Lang, A. Petrashyk, R. R. Prado, V. Fallah Ramazani, J. P. Finley, Jodi Christiansen, P. Wilcox, Olivier Hervet, A. J.R. Weinstein, A. D. Falcone, Matthew L. Lister, D. S. Hanna, N. Kelley-Hoskins, Ralph Bird, I. Sadeh, David A. Williams, Gordon T. Richards, A. Archer, E. Roache, D. B. Kieda, Orel Gueta, L. O. Takalo, G. H. Gillanders, Yuri Y. Kovalev, P. T. Reynolds, E. Lindfors, Marcos Santander, Reshmi Mukherjee, C. Giuri, R. M. Wells, E. Pueschel, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Fermi-LAT, VERITAS, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), University of Turku, Metsähovi Radio Observatory, Anne Lähteenmäki Group, Department of Electronics and Nanoengineering, Aalto-yliopisto, and Aalto University
- Subjects
010504 meteorology & atmospheric sciences ,Infrared ,Flux ,Astrophysics ,4/3 ,01 natural sciences ,law.invention ,law ,Jets ,Broadband ,010303 astronomy & astrophysics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,Gamma ray ,Optical polarization ,Galaxies: active ,gamma-rays ,Synchrotron ,Wavelength ,gamma ray: emission ,optical [polarization] ,infrared ,BL Lacertae objects ,VERITAS ,Astrophysics - High Energy Astrophysical Phenomena ,Gamma-rays ,ON 325 ,jets ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,GLAST ,blazar ,X-ray ,emission [gamma ray] ,synchrotron ,0103 physical sciences ,polarization: optical ,Blazar ,0105 earth and related environmental sciences ,B2 1215+30 ,S3 1215+30) ,Astronomy and Astrophysics ,flux ,13. Climate action ,Space and Planetary Science ,correlation ,Active galaxies ,ddc:520 ,blazars BL Lacertae objects: individ- ual: 1ES 1215+303 (Ton 605 ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Blazars - 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., Comment: Accepted for publication in the Astrophysical Journal
- Published
- 2020
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