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24 April 2024 |
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Multi-wavelength activity of the BL Lac Blazar OJ 287 After its First VHE Activity: Spectro-temporal Evolution and Remergence of the HBL like Component | | Pankaj Kushwaha
; Main Pal
; Nibedita Kalita
; Neeraj Kumari
; Sachindra Naik
; Alok C Gupta
; E. M. de Gouveia Dal Pino
; Minfeng Gu
; | | Date: |
27 Oct 2020 | | Abstract: | We report the reemergence of a new broadband emission through a detailed and
systematic study of the multi-wavelength spectral and temporal behavior of OJ
287 after its first VHE activity in 2017 to date, which includes the
second-highest X-ray flux of the source. The source shows strong optical to
X-ray flux variations, accompanied mainly by strong spectral changes. The
optical to X-ray flux variations are correlated and simultaneous except for two
durations when they are anti-correlated. The flux variations, however, are
anti-correlated with spectral state for X-rays but correlated for optical-UV
(ultraviolet). Weekly binned {it Fermi}-LAT data around the duration of the
highest X-ray activity show a few detections with a log-parabola model but none
with a power-law, yet the LAT spectral energy distributions (SEDs) for high
activity duration is similar for both the models and show a hardening above 1
GeV. Near-infrared (NIR) data indicate strong spectral change while joint Swift
and NuSTAR spectrum indicate a thermal component of $
m 3 imes 10^4$~K.
Overall, the observed spectral features establish the observed variations to a
new high-energy-peaked (HBL) broadband non-thermal emission component, similar
to the one seen during the highest X-ray flux state of the source in 2017. The
observed activities indicate some peculiar features that seem to be
characteristic of this emission component while its appearance, a few years
around the claimed (sim 12)-year optical outbursts strongly indicate a
connection between the two. | | Source: | arXiv, 2010.14431 | | Services: | Forum | Review | PDF | Favorites | |
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