Detection of significant cm to sub-mm band radio and γ-ray correlated variability in Fermi bright blazars
Abstract
The exact location of the γ-ray emitting region in blazars is still controversial. In order to attack this problem we present first results of a cross-correlation analysis between radio (11 cm to 0.8 mm wavelength, F-GAMMA programme) and γ-ray (0.1–300 GeV) ~3.5 yr light curves of 54 Fermi-bright blazars. We perform a source stacking analysis and estimate significances and chance correlations using mixed source correlations. These results reveal: (i) the first highly significant multiband radio and γ-ray correlations (radio lagging γ rays) when averaging over the whole sample, (ii) average time delays (source frame: 76 ± 23 to 7 ± 9 d), systematically decreasing from cm to mm/sub-mm bands with a frequency dependence τr, γ(ν) ∝ ν-1, in good agreement with jet opacity dominated by synchrotron self-absorption, (iii) a bulk γ-ray production region typically located within/upstream of the 3 mm core region (τ3mm, γ = 12 ± 8 d), (iv) mean distances between the region of γ-ray peak emission and the radio ‘τ = 1 photosphere’ decreasing from 9.8 ± 3.0 pc (11 cm) to 0.9 ± 1.1 pc (2 mm) and 1.4 ± 0.8 pc (0.8 mm), (v) 3 mm/γ-ray correlations in nine individual sources at a significance levelmore »
- Authors:
-
- Max Planck Inst. for Radio Astronomy, Bonn (Germany)
- Stockholm Univ. (Sweden). Oskar Klein Centre
- Stanford Univ. and SLAC National Accelerator Lab., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology
- Inst. of Millimetric Radio Astronomy, Granada (Spain)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermi LAT Collaboration
- OSTI Identifier:
- 1356525
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 441; Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; galaxies: jets; galaxies: nuclei; quasars: general; gamma-rays: galaxies; radio continuum: galaxies
Citation Formats
Fuhrmann, L., Larsson, S., Chiang, J., Angelakis, E., Zensus, J. A., Nestoras, I., Krichbaum, T. P., Ungerechts, H., Sievers, A., Pavlidou, V., Readhead, A. C. S., Max-Moerbeck, W., and Pearson, T. J. Detection of significant cm to sub-mm band radio and γ-ray correlated variability in Fermi bright blazars. United States: N. p., 2014.
Web. doi:10.1093/mnras/stu540.
Fuhrmann, L., Larsson, S., Chiang, J., Angelakis, E., Zensus, J. A., Nestoras, I., Krichbaum, T. P., Ungerechts, H., Sievers, A., Pavlidou, V., Readhead, A. C. S., Max-Moerbeck, W., & Pearson, T. J. Detection of significant cm to sub-mm band radio and γ-ray correlated variability in Fermi bright blazars. United States. https://doi.org/10.1093/mnras/stu540
Fuhrmann, L., Larsson, S., Chiang, J., Angelakis, E., Zensus, J. A., Nestoras, I., Krichbaum, T. P., Ungerechts, H., Sievers, A., Pavlidou, V., Readhead, A. C. S., Max-Moerbeck, W., and Pearson, T. J. Mon .
"Detection of significant cm to sub-mm band radio and γ-ray correlated variability in Fermi bright blazars". United States. https://doi.org/10.1093/mnras/stu540. https://www.osti.gov/servlets/purl/1356525.
@article{osti_1356525,
title = {Detection of significant cm to sub-mm band radio and γ-ray correlated variability in Fermi bright blazars},
author = {Fuhrmann, L. and Larsson, S. and Chiang, J. and Angelakis, E. and Zensus, J. A. and Nestoras, I. and Krichbaum, T. P. and Ungerechts, H. and Sievers, A. and Pavlidou, V. and Readhead, A. C. S. and Max-Moerbeck, W. and Pearson, T. J.},
abstractNote = {The exact location of the γ-ray emitting region in blazars is still controversial. In order to attack this problem we present first results of a cross-correlation analysis between radio (11 cm to 0.8 mm wavelength, F-GAMMA programme) and γ-ray (0.1–300 GeV) ~3.5 yr light curves of 54 Fermi-bright blazars. We perform a source stacking analysis and estimate significances and chance correlations using mixed source correlations. These results reveal: (i) the first highly significant multiband radio and γ-ray correlations (radio lagging γ rays) when averaging over the whole sample, (ii) average time delays (source frame: 76 ± 23 to 7 ± 9 d), systematically decreasing from cm to mm/sub-mm bands with a frequency dependence τr, γ(ν) ∝ ν-1, in good agreement with jet opacity dominated by synchrotron self-absorption, (iii) a bulk γ-ray production region typically located within/upstream of the 3 mm core region (τ3mm, γ = 12 ± 8 d), (iv) mean distances between the region of γ-ray peak emission and the radio ‘τ = 1 photosphere’ decreasing from 9.8 ± 3.0 pc (11 cm) to 0.9 ± 1.1 pc (2 mm) and 1.4 ± 0.8 pc (0.8 mm), (v) 3 mm/γ-ray correlations in nine individual sources at a significance level where one is expected by chance (probability: 4 × 10-6), (vi) opacity and ‘time lag core shift’ estimates for quasar 3C 454.3 providing a lower limit for the distance of the bulk γ-ray production region from the supermassive black hole (SMBH) of ~0.8–1.6 pc, i.e. at the outer edge of the broad-line region (BLR) or beyond. A 3 mm τ = 1 surface at ~2–3 pc from the jet base (i.e. well outside the ‘canonical BLR’) finally suggests that BLR material extends to several parsec distances from the SMBH.},
doi = {10.1093/mnras/stu540},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 441,
place = {United States},
year = {Mon May 12 00:00:00 EDT 2014},
month = {Mon May 12 00:00:00 EDT 2014}
}
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Characterizing the Gamma-Ray Variability of the Brightest Flat Spectrum Radio Quasars Observed with the Fermi LAT
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- The Astrophysical Journal, Vol. 877, Issue 1
Curvature-induced Polarization and Spectral Index Behavior for PKS 1502+106
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Gamma-ray emitting narrow-line Seyfert 1 galaxies: Past, present, and future
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Multi-wavelength characterization of the blazar S5 0716+714 during an unprecedented outburst phase
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- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Radio and optical intra-day variability observations of five blazars
text, January 2017
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- The University of North Carolina at Chapel Hill University Libraries
A sample of weak blazars at milli-arcsecond resolution
text, January 2015
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Resolving the High Energy Universe with Strong Gravitational Lensing: The Case of PKS 1830-211
text, January 2015
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- arXiv
PKS 1502+106: A high-redshift Fermi blazar at extreme angular resolution. Structural dynamics with VLBI imaging up to 86 GHz
text, January 2015
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- arXiv
Radio follow-up of the gamma-ray flaring gravitational lens JVAS B0218+357
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- arXiv
Location of Gamma-ray emission and magnetic field strengths in OJ 287
text, January 2016
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- arXiv
The F-GAMMA program: Multi-frequency study of Active Galactic Nuclei in the Fermi era. Program description and the first 2.5 years of monitoring
text, January 2016
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A revised lens time delay for JVAS B0218+357 from a reanalysis of VLA monitoring data
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- arXiv
Multiwavelength Cross-Correlations and Flaring Activity in Bright Blazars
text, January 2018
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- arXiv
Multi-frequency variability study of Ton 599 during high activity of 2017
text, January 2018
- Prince, Raj
- arXiv
F-GAMMA: Multi-frequency radio monitoring of Fermi blazars. The 2.64 to 43 GHz Effelsberg light curves from 2007-2015
text, January 2019
- Angelakis, E.; Fuhrmann, L.; Myserlis, I.
- arXiv
Stochastic modeling of the time variability of ALMA calibrators
text, January 2019
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- arXiv
Physical Inference from the gamma-ray, X-Ray and Optical Time Variability of a Large Sample of Fermi Blazars
text, January 2019
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- arXiv
Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-2017
text, January 2019
- D'Ammando, F.; Raiteri, C. M.; Villata, M.
- arXiv
Curvature induced polarization and spectral index behavior for PKS 1502+106
text, January 2020
- Shao, Xi; Jiang, Yunguo; Chen, Xu
- arXiv
Predicting Positive and Negative Links with Noisy Queries: Theory & Practice
preprint, January 2017
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- arXiv