Multiwavelength Variability Power Spectrum Analysis of the Blazars 3C 279 and PKS 1510-089 on Multiple Timescales
Tornikoski M; van Zyl P; Marscher AP; Soida M; Aller HD; Nilsson K; Hovatta T; Nalewajko K; Goyal A; Zola S; Caton DB; Kiehlmann S; Wiita PJ; Horan D; Ramazani VF; Lindfors E; Stawarz L; Lähteenmäki A; Reichart DE; Readhead ACS; Max-Moerbeck W; Aller MF; Hodges M; Jorstad S; Ojha R; Valverde J; Tammi J
Multiwavelength Variability Power Spectrum Analysis of the Blazars 3C 279 and PKS 1510-089 on Multiple Timescales
Tornikoski M
van Zyl P
Marscher AP
Soida M
Aller HD
Nilsson K
Hovatta T
Nalewajko K
Goyal A
Zola S
Caton DB
Kiehlmann S
Wiita PJ
Horan D
Ramazani VF
Lindfors E
Stawarz L
Lähteenmäki A
Reichart DE
Readhead ACS
Max-Moerbeck W
Aller MF
Hodges M
Jorstad S
Ojha R
Valverde J
Tammi J
IOP Publishing Ltd
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2022081155110
https://urn.fi/URN:NBN:fi-fe2022081155110
Tiivistelmä
We present the results of variability power spectral density (PSD) analysis using multiwavelength radio to GeV gamma-ray light curves covering timescales of decades/years to days/minutes for the blazars 3C 279 and PKS 1510-089. The PSDs are modeled as single power laws, and the best-fit spectral shape is derived using the "power spectral response" method. With more than 10 yr of data obtained with weekly/daily sampling intervals, most of the PSDs cover similar to 2-4 decades in temporal frequency; moreover, in the optical band, the PSDs cover similar to 6 decades for 3C 279 due to the availability of intranight light curves. Our main results are the following: (1) on timescales ranging from decades to days, the synchrotron and the inverse-Compton spectral components, in general, exhibit red-noise (slope similar to 2) and flicker-noise (slope similar to 1) type variability, respectively; (2) the slopes of gamma-ray variability PSDs obtained using a 3 hr integration bin and 3 weeks total duration exhibit a range between similar to 1.4 and similar to 2.0 (mean slope = 1.60 +/- 0.70), consistent within errors with the slope on longer timescales; (3) comparisons of fractional variability indicate more power on timescales <= 100 days at gamma-ray frequencies compared to longer wavelengths, in general (except between the gamma-ray and optical wavelengths for PKS 1510-089); (4) the normalization of intranight optical PSDs for 3C 279 appears to be a simple extrapolation from longer timescales, indicating a continuous (single) process driving the variability at optical wavelengths; and (5) the emission at optical/infrared wavelengths may involve a combination of disk and jet processes for PKS 1510-089.
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