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

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; D. 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

doi:10.3847/1538-4357/ab765d

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

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. GentG. 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, D. 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

Physics and Astronomy (Twin Cities)

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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 multiwavelength 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 Very Long Baseline Array 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.

Original language	English (US)
Article number	170
Journal	Astrophysical Journal
Volume	891
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ab765d
State	Published - Mar 10 2020

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Valverde, J., Horan, D., Bernard, D., Fegan, S., Abeysekara, A. U., Archer, A., Benbow, W., Bird, R., Brill, A., Brose, R., Buchovecky, M., Buckley, J. H., Christiansen, J. L., Cui, W., Falcone, A., Feng, Q., Finley, J. P., Fortson, L., Furniss, A., ... Tornikoski, M. (2020). 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. Astrophysical Journal, 891(2), Article 170. https://doi.org/10.3847/1538-4357/ab765d

Valverde, J, Horan, D, Bernard, D, Fegan, S, Abeysekara, AU, Archer, A, Benbow, W, Bird, R, Brill, A, Brose, R, Buchovecky, M, Buckley, JH, Christiansen, JL, Cui, W, Falcone, A, Feng, Q, Finley, JP, Fortson, L, Furniss, A, Gent, A, Gillanders, GH, Giuri, C, Gueta, O, Hanna, D, Hassan, T, Hervet, O, Holder, J, Hughes, G, Humensky, TB, Kaaret, P, Kelley-Hoskins, N, Kertzman, M, Kieda, D, Krause, M, Krennrich, F, Lang, MJ, Maier, G, Moriarty, P, Mukherjee, R, Nieto, D, Nievas-Rosillo, M, O'Brien, S, Ong, RA, Otte, AN, Park, N, Petrashyk, A, Pfrang, K, Pichel, A, Pohl, M, Prado, RR, Pueschel, E, Quinn, J, Ragan, K, Reynolds, PT, Ribeiro, D, Richards, GT, Roache, E, Sadeh, I, Santander, M, Scott, SS, Sembroski, GH, Shahinyan, K, Shang, R, Sushch, I, Vassiliev, VV, Weinstein, A, Wells, RM, Wilcox, P, Wilhelm, A, Williams, DA, Williamson, TJ, Noto, G, Edwards, PG, Piner, BG, Ramazani, VF, Hovatta, T, Jormanainen, J, Lindfors, E, Nilsson, K, Takalo, L, Kovalev, YY, Lister, ML, Pushkarev, AB, Savolainen, T, Kiehlmann, S, Max-Moerbeck, W, Readhead, ACS, Lähteenmäki, A & Tornikoski, M 2020, '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', Astrophysical Journal, vol. 891, no. 2, 170. https://doi.org/10.3847/1538-4357/ab765d

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title = "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",

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 multiwavelength 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 Very Long Baseline Array 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.",

author = "Janeth Valverde and Deirdre Horan and Denis Bernard and Stephen Fegan and Abeysekara, {A. U.} and A. Archer and W. Benbow and R. Bird and A. Brill and R. Brose and M. Buchovecky and Buckley, {J. H.} and Christiansen, {J. L.} and W. Cui and A. Falcone and Q. Feng and Finley, {J. P.} and L. Fortson and A. Furniss and A. Gent and Gillanders, {G. H.} and C. Giuri and O. Gueta and D. Hanna and T. Hassan and O. Hervet and J. Holder and G. Hughes and Humensky, {T. B.} and P. Kaaret and N. Kelley-Hoskins and M. Kertzman and D. Kieda and M. Krause and F. Krennrich and Lang, {M. J.} and G. Maier and P. Moriarty and R. Mukherjee and D. Nieto and M. Nievas-Rosillo and S. O'Brien and Ong, {R. A.} and Otte, {A. N.} and N. Park and A. Petrashyk and K. Pfrang and A. Pichel and M. Pohl and Prado, {R. R.} and E. Pueschel and J. Quinn and K. Ragan and Reynolds, {P. T.} and D. Ribeiro and Richards, {G. T.} and E. Roache and I. Sadeh and M. Santander and Scott, {S. S.} and Sembroski, {G. H.} and K. Shahinyan and R. Shang and I. Sushch and Vassiliev, {V. V.} and A. Weinstein and Wells, {R. M.} and P. Wilcox and A. Wilhelm and Williams, {D. A.} and Williamson, {T. J.} and Giuliana Noto and Edwards, {P. G.} and Piner, {B. G.} and Ramazani, {V. Fallah} and T. Hovatta and J. Jormanainen and E. Lindfors and K. Nilsson and L. Takalo and Kovalev, {Y. Y.} and Lister, {M. L.} and Pushkarev, {A. B.} and T. Savolainen and S. Kiehlmann and W. Max-Moerbeck and Readhead, {A. C.S.} and A. L{\"a}hteenm{\"a}ki and M. Tornikoski",

year = "2020",

month = mar,

day = "10",

doi = "10.3847/1538-4357/ab765d",

language = "English (US)",

volume = "891",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - A Decade of Multiwavelength Observations of the TeV Blazar 1ES 1215+303

T2 - Extreme Shift of the Synchrotron Peak Frequency and Long-term Optical-Gamma-Ray Flux Increase

AU - Valverde, Janeth

AU - Horan, Deirdre

AU - Bernard, Denis

AU - Fegan, Stephen

AU - Abeysekara, A. U.

AU - Archer, A.

AU - Benbow, W.

AU - Bird, R.

AU - Brill, A.

AU - Brose, R.

AU - Buchovecky, M.

AU - Buckley, J. H.

AU - Christiansen, J. L.

AU - Cui, W.

AU - Falcone, A.

AU - Feng, Q.

AU - Finley, J. P.

AU - Fortson, L.

AU - Furniss, A.

AU - Gent, A.

AU - Gillanders, G. H.

AU - Giuri, C.

AU - Gueta, O.

AU - Hanna, D.

AU - Hassan, T.

AU - Hervet, O.

AU - Holder, J.

AU - Hughes, G.

AU - Humensky, T. B.

AU - Kaaret, P.

AU - Kelley-Hoskins, N.

AU - Kertzman, M.

AU - Kieda, D.

AU - Krause, M.

AU - Krennrich, F.

AU - Lang, M. J.

AU - Maier, G.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - Nieto, D.

AU - Nievas-Rosillo, M.

AU - O'Brien, S.

AU - Ong, R. A.

AU - Otte, A. N.

AU - Park, N.

AU - Petrashyk, A.

AU - Pfrang, K.

AU - Pichel, A.

AU - Pohl, M.

AU - Prado, R. R.

AU - Pueschel, E.

AU - Quinn, J.

AU - Ragan, K.

AU - Reynolds, P. T.

AU - Ribeiro, D.

AU - Richards, G. T.

AU - Roache, E.

AU - Sadeh, I.

AU - Santander, M.

AU - Scott, S. S.

AU - Sembroski, G. H.

AU - Shahinyan, K.

AU - Shang, R.

AU - Sushch, I.

AU - Vassiliev, V. V.

AU - Weinstein, A.

AU - Wells, R. M.

AU - Wilcox, P.

AU - Wilhelm, A.

AU - Williams, D. A.

AU - Williamson, T. J.

AU - Noto, Giuliana

AU - Edwards, P. G.

AU - Piner, B. G.

AU - Ramazani, V. Fallah

AU - Hovatta, T.

AU - Jormanainen, J.

AU - Lindfors, E.

AU - Nilsson, K.

AU - Takalo, L.

AU - Kovalev, Y. Y.

AU - Lister, M. L.

AU - Pushkarev, A. B.

AU - Savolainen, T.

AU - Kiehlmann, S.

AU - Max-Moerbeck, W.

AU - Readhead, A. C.S.

AU - Lähteenmäki, A.

AU - Tornikoski, M.

PY - 2020/3/10

Y1 - 2020/3/10

N2 - 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 multiwavelength 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 Very Long Baseline Array 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.

AB - 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 multiwavelength 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 Very Long Baseline Array 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.

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DO - 10.3847/1538-4357/ab765d

M3 - Article

AN - SCOPUS:85084074857

SN - 0004-637X

VL - 891

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 170

ER -

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

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