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Detection of signif...
Detection of significant cm to sub-mm band radio and gamma-ray correlated variability in Fermi bright blazars
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Fuhrmann, L. (författare)
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- Larsson, Stefan (författare)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Chiang, J. (författare)
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Angelakis, E. (författare)
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Zensus, J. A. (författare)
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Nestoras, I. (författare)
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Krichbaum, T. P. (författare)
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Ungerechts, H. (författare)
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Sievers, A. (författare)
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Pavlidou, V. (författare)
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Readhead, A. C. S. (författare)
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Max-Moerbeck, W. (författare)
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Pearson, T. J. (författare)
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(creator_code:org_t)
- 2014-05-12
- 2014
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 441:3, s. 1899-1909
- Relaterad länk:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The exact location of the gamma-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 gamma-ray (0.1-300 GeV) similar to 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. Our results reveal: (i) the first highly significant multiband radio and. gamma-ray correlations (radio lagging gamma 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 tau(r,gamma)(v) proportional to v(-1), in good agreement with jet opacity dominated by synchrotron self-absorption, (iii) a bulk gamma-ray production region typically located within/upstream of the 3 mm core region (tau(3mm),(gamma) = 12 +/- 8 d), (iv) mean distances between the region of. gamma-ray peak emission and the radio 'tau = 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/gamma-ray correlations in nine individual sources at a significance level where one is expected by chance (probability: 4 x 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 gamma-ray production region from the supermassive black hole (SMBH) of similar to 0.8-1.6 pc, i.e. at the outer edge of the broad-line region (BLR) or beyond. A 3 mm tau = 1 surface at similar to 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: active
- galaxies: jets
- galaxies: nuclei
- quasars: general
- gammarays: galaxies
- radio continuum: galaxies
Publikations- och innehållstyp
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- art (ämneskategori)
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Fuhrmann, L.
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Larsson, Stefan
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Chiang, J.
-
Angelakis, E.
-
Zensus, J. A.
-
Nestoras, I.
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visa fler...
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Krichbaum, T. P.
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Ungerechts, H.
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Sievers, A.
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Pavlidou, V.
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Readhead, A. C. ...
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Max-Moerbeck, W.
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Pearson, T. J.
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visa färre...
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Stockholms universitet