2024ApJ...973..134A

Query : 2024ApJ...973..134A

2024ApJ...973..134A - Astrophys. J., 973, 134 (2024/October-1)

A Multiwavelength 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., McGRATH C.E., 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. (The VERITAS Collaboration), JORSTAD S.G., LICO R., LUSEN P. and MARSCHER A.P.

Abstract (from CDS):

In 2017 February, 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 the Swift X-ray Telescope. 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 ± 0.26) and an integral flux corresponding to ∼2.4% that of the Crab Nebula above the same energy. Contemporaneous data from multiple instruments across the electromagnetic spectrum reveal a 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 2017 February peak. The spectral energy distributions during these periods suggest the presence of at least two nonthermal 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.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Blazars - Active galactic nuclei - Active galaxies - Gamma-ray astronomy - Gamma-ray sources

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 942 2
2 RX J0521.7+2112 BLL 05 21 45.9657388992 +21 12 51.452786736           ~ 162 1
3 PG 0851+202 BLL 08 54 48.8749846272 +20 06 30.639583620   15.649 15.146 15.446   ~ 2513 1
4 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 924 1
5 ESO 514-1 BLL 15 17 41.8134049824 -24 22 19.482207024   15.13 14.00 13.95   ~ 815 3
6 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1

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