Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7146
Title: Multi-frequency Variability Study of Ton 599 during the High Activity of 2017
Authors: Prince, Raj
Keywords: galaxies:active–gamma rays
galaxies–quasars:individual(Ton599)
Issue Date: 20-Jan-2019
Publisher: IOP Sciences for The American Astronomical Society
Citation: Astrophysical Journal, 2019, Vol. 871, p101
Abstract: In this work, I have presented a multi-frequency variability and correlation study of the blazar Ton 599, which was observed first time in flaring state at the end of 2017. Data from \textit{Fermi}-LAT, Swift-XRT/UVOT, Steward Observatory, and OVRO (15 GHz) is used, and it is found that the source is more variable in γ-ray and optical/UV than X-ray and radio. Large variations in the degree of polarization (DoP) and position angle (PA) is noticed during the flaring period. Maximum flux during γ-ray flare is found to be 12.63×10−7 at MJD 58057.5 from the 1-day bin light curve (LC), which is the maximum flux ever achieved by this source. It is further found that all the peaks of flare are very symmetric, which suggests the cooling time of electrons is much smaller than light crossing time. Using 1-day as a fast variability time, the size of the γ-ray emission region is estimated as 1.88×1016 cm. Two 42 GeV of photons are detected during the flare which puts a constraint on the location of the emission region, and it is found that the γ-ray emitting blob is located at the outer edge or outside the broad line region (BLR). A trend of increasing fractional variability towards higher energies is also seen. Strong correlations were seen between γ-ray, optical/UV, X-ray, and radio (15 GHz) emission. A small time lag between γ-ray and optical/UV suggest their emission to be co-spatial while lag of 27 days between γ-ray and OVRO (15 GHz) suggest two different emission zone separated by a distance of ∼ 5 pc.
Description: Open Access
URI: http://hdl.handle.net/2289/7146
ISSN: 0004-637X
1538-4357-(Online)
Alternative Location: http://adsabs.harvard.edu/abs/2019ApJ...871..101P
https://arxiv.org/abs/1811.11256
https://doi.org/10.3847/1538-4357/aaf475
Copyright: 2019, The American Astronomical Society
Appears in Collections:Research Papers (A&A)

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