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A multi-wavelength study to decipher the 2017 flare of the blazar OJ 287

Fuente: arXiv

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Autori principali:	Acharyya, A., Adams, C. B., Archer, A., Bangale, P., Bartkoske, J. T., Batista, P., Benbow, W., Brill, A., Caldwell, J. P., Carini, M., Christiansen, J. L., Chromey, A. J., Errando, M., Falcone, A., Feng, Q., Finley, J. P., Foote, J., Fortson, L., Furniss, A., Gallagher, G., Hanlon, W., Hanna, D., Hervet, O., Hinrichs, C. E., Hoang, J., Holder, J., Humensky, T. B., Jin, W., Johnson, M. N., Kaaret, P., Kertzman, M., Kherlakian, M., Kieda, D., Kleiner, T. K., Korzoun, N., Krennrich, F., Kumar, S., Lang, M. J., Lundy, M., Maier, G., EMcGrath, C., Millard, M. J., Millis, J., Mooney, C. L., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Pohl, M., Pueschel, E., Quinn, J., Rabinowitz, P. L., Ragan, K., Reynolds, P. T., Ribeiro, D., Roache, E., Ryan, J. L., Sadeh, I., Sadun, A. C., Saha, L., Santander, M., Sembroski, G. H., Shahinyan, K., Shang, R., Splettstoesser, M., Tak, D., Talluri, A. K., Tucci, J. V., Williams, D. A., Wong, S. L., Jorstad, S. G., Lico, R., Lusen, P., Marscher, A. P.
Natura:	Preprint
Pubblicazione:	2024
Soggetti:	High Energy Astrophysical Phenomena Astrophysics of Galaxies
Accesso online:	Acceder al recurso
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_version_	1866917759613403136
author	Acharyya, A. Adams, C. B. Archer, A. Bangale, P. Bartkoske, J. T. Batista, P. Benbow, W. Brill, A. Caldwell, J. P. Carini, M. Christiansen, J. L. Chromey, A. J. Errando, M. Falcone, A. Feng, Q. Finley, J. P. Foote, J. Fortson, L. Furniss, A. Gallagher, G. Hanlon, W. Hanna, D. Hervet, O. Hinrichs, C. E. Hoang, J. Holder, J. Humensky, T. B. Jin, W. Johnson, M. N. Kaaret, P. Kertzman, M. Kherlakian, M. Kieda, D. Kleiner, T. K. Korzoun, N. Krennrich, F. Kumar, S. Lang, M. J. Lundy, M. Maier, G. EMcGrath, C. Millard, M. J. Millis, J. Mooney, C. L. Moriarty, P. Mukherjee, R. O'Brien, S. Ong, R. A. Pohl, M. Pueschel, E. Quinn, J. Rabinowitz, P. L. Ragan, K. Reynolds, P. T. Ribeiro, D. Roache, E. Ryan, J. L. Sadeh, I. Sadun, A. C. Saha, L. Santander, M. Sembroski, G. H. Shahinyan, K. Shang, R. Splettstoesser, M. Tak, D. Talluri, A. K. Tucci, J. V. Williams, D. A. Wong, S. L. Jorstad, S. G. Lico, R. Lusen, P. Marscher, A. P.
author_facet	Acharyya, A. Adams, C. B. Archer, A. Bangale, P. Bartkoske, J. T. Batista, P. Benbow, W. Brill, A. Caldwell, J. P. Carini, M. Christiansen, J. L. Chromey, A. J. Errando, M. Falcone, A. Feng, Q. Finley, J. P. Foote, J. Fortson, L. Furniss, A. Gallagher, G. Hanlon, W. Hanna, D. Hervet, O. Hinrichs, C. E. Hoang, J. Holder, J. Humensky, T. B. Jin, W. Johnson, M. N. Kaaret, P. Kertzman, M. Kherlakian, M. Kieda, D. Kleiner, T. K. Korzoun, N. Krennrich, F. Kumar, S. Lang, M. J. Lundy, M. Maier, G. EMcGrath, C. Millard, M. J. Millis, J. Mooney, C. L. Moriarty, P. Mukherjee, R. O'Brien, S. Ong, R. A. Pohl, M. Pueschel, E. Quinn, J. Rabinowitz, P. L. Ragan, K. Reynolds, P. T. Ribeiro, D. Roache, E. Ryan, J. L. Sadeh, I. Sadun, A. C. Saha, L. Santander, M. Sembroski, G. H. Shahinyan, K. Shang, R. Splettstoesser, M. Tak, D. Talluri, A. K. Tucci, J. V. Williams, D. A. Wong, S. L. Jorstad, S. G. Lico, R. Lusen, P. Marscher, A. P.
contents	In February 2017, the blazar OJ~287 underwent a period of intense multiwavelength activity. It reached a new historic peak in the soft X-ray (0.3-10 keV) band, as measured by Swift-XRT. This event coincides with a very-high-energy (VHE) $γ$-ray outburst that led VERITAS to detect emission above 100 GeV, with a detection significance of $10σ$ (from 2016 December 9 to 2017 March 31). The time-averaged VHE $γ$-ray spectrum was consistent with a soft power law ($Γ= -3.81 \pm 0.26$) and an integral flux corresponding to $\sim2.4\%$ that of the Crab Nebula above the same energy. Contemporaneous data from multiple instruments across the electromagnetic spectrum reveal complex flaring behavior, primarily in the soft X-ray and VHE bands. To investigate the possible origin of such an event, our study focuses on three distinct activity states: before, during, and after the February 2017 peak. The spectral energy distributions during these periods suggest the presence of at least two non-thermal emission zones, with the more compact one responsible for the observed flare. Broadband modeling results and observations of a new radio knot in the jet of OJ~287 in 2017 are consistent with a flare originating from a strong recollimation shock outside the radio core.
format	Preprint
id	arxiv_https___arxiv_org_abs_2407_11848
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	A multi-wavelength study to decipher the 2017 flare of the blazar OJ 287 Acharyya, A. Adams, C. B. Archer, A. Bangale, P. Bartkoske, J. T. Batista, P. Benbow, W. Brill, A. Caldwell, J. P. Carini, M. Christiansen, J. L. Chromey, A. J. Errando, M. Falcone, A. Feng, Q. Finley, J. P. Foote, J. Fortson, L. Furniss, A. Gallagher, G. Hanlon, W. Hanna, D. Hervet, O. Hinrichs, C. E. Hoang, J. Holder, J. Humensky, T. B. Jin, W. Johnson, M. N. Kaaret, P. Kertzman, M. Kherlakian, M. Kieda, D. Kleiner, T. K. Korzoun, N. Krennrich, F. Kumar, S. Lang, M. J. Lundy, M. Maier, G. EMcGrath, C. Millard, M. J. Millis, J. Mooney, C. L. Moriarty, P. Mukherjee, R. O'Brien, S. Ong, R. A. Pohl, M. Pueschel, E. Quinn, J. Rabinowitz, P. L. Ragan, K. Reynolds, P. T. Ribeiro, D. Roache, E. Ryan, J. L. Sadeh, I. Sadun, A. C. Saha, L. Santander, M. Sembroski, G. H. Shahinyan, K. Shang, R. Splettstoesser, M. Tak, D. Talluri, A. K. Tucci, J. V. Williams, D. A. Wong, S. L. Jorstad, S. G. Lico, R. Lusen, P. Marscher, A. P. High Energy Astrophysical Phenomena Astrophysics of Galaxies In February 2017, the blazar OJ~287 underwent a period of intense multiwavelength activity. It reached a new historic peak in the soft X-ray (0.3-10 keV) band, as measured by Swift-XRT. This event coincides with a very-high-energy (VHE) $γ$-ray outburst that led VERITAS to detect emission above 100 GeV, with a detection significance of $10σ$ (from 2016 December 9 to 2017 March 31). The time-averaged VHE $γ$-ray spectrum was consistent with a soft power law ($Γ= -3.81 \pm 0.26$) and an integral flux corresponding to $\sim2.4\%$ that of the Crab Nebula above the same energy. Contemporaneous data from multiple instruments across the electromagnetic spectrum reveal complex flaring behavior, primarily in the soft X-ray and VHE bands. To investigate the possible origin of such an event, our study focuses on three distinct activity states: before, during, and after the February 2017 peak. The spectral energy distributions during these periods suggest the presence of at least two non-thermal emission zones, with the more compact one responsible for the observed flare. Broadband modeling results and observations of a new radio knot in the jet of OJ~287 in 2017 are consistent with a flare originating from a strong recollimation shock outside the radio core.
title	A multi-wavelength study to decipher the 2017 flare of the blazar OJ 287
topic	High Energy Astrophysical Phenomena Astrophysics of Galaxies
url	https://arxiv.org/abs/2407.11848