Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1)

Multiwavelength Variability Power Spectrum Analysis of the Blazars 3C 279 and PKS 1510-089 on Multiple Timescales




Julkaisun tekijätGoyal Arti, Soida Marian, Stawarz Łukasz, Wiita Paul J., Nilsson Kari, Jorstad Svetlana, Marscher Alan P., Aller Margo F., Aller Hugh D., Lähteenmäki Anne, Hovatta Talvikki, Zoła Staszek, Nalewajko Krzysztof, Tornikoski Merja, Tammi Joni, Hodges Mark, Kiehlmann Sebastian, Readhead Anthony C. S., Max-Moerbeck Walter, Lindfors Elina, Ramazani Vandad Fallah, Reichart D. E., Caton D. B., Valverde Janeth, Horan Deirdre, Ojha Roopesh, van Zyl Pfesesani

KustantajaIOP Publishing Ltd

Julkaisuvuosi2022

JournalAstrophysical Journal

Tietokannassa oleva lehden nimiASTROPHYSICAL JOURNAL

Lehden akronyymiASTROPHYS J

Artikkelin numero 214

Volyymi927

Julkaisunumero2

Sivujen määrä29

ISSN0004-637X

eISSN1538-4357

DOIhttp://dx.doi.org/10.3847/1538-4357/ac4d95

Verkko-osoitehttps://iopscience.iop.org/article/10.3847/1538-4357/ac4d95

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/175027464


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.

Ladattava julkaisu

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.




Last updated on 2023-12-05 at 10:50