5 year Global 3-mm VLBI survey of Gamma-ray active blazars

Hodgson, J.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)

The Global mm-VLBI Array (GMVA) is a network of 14.3 mm and 7 mm capable telescopes spanning Europe and the United States, with planned extensions to Asia. The array is capable of sensitive maps with angular resolution often exceeding 50 μas. Using the GMVA, a large sample of prominent γ-ray blazars have been observed approximately 6 monthly from later 2008 until now. Combining 3 mm maps from the GMVA with near-in-time 7 mm maps from the VLBA-BU-BLAZAR program and 2 cm maps from the MOJAVE program, we determine the sub-pc morphology and high frequency spectral structure of γ-ray blazars. The magnetic field strengthcan be estimated at different locations along the jet under the assumption of equipartition between magnetic field and relativistic particle energies. Making assumptions on the jet magnetic field configuration (e.g. poloidal or toroidal), we can estimate the separation of the mm-wave “core” and the jet base, and estimate the strength of the magnetic field there. The results of this analysisshow that on average, the magnetic field strength decreases with a power-law (B proportional to r^(−n), with n = 0.3 +/- 0.2). This suggests that on average, the mm-wave “core” is ∼ 1 − 3 pc downstream of the deprojected jet apex and that the magnetic field strength is of the order B apex ∼ 5 − 20 kG, broadly consistent with the predictions of magnetic jet launching (e.g. via magnetically arrested disks, MAD).

Krichbaum, T. P.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Marscher, A.Boston University (author)
Jorstad, S.G.Boston University (author)
Marti-Vidal, Ivan,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mivan (author)
Lindqvist, Michael,1960Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mlq (author)
Bremer, M.Institut de Radioastronomie Millimétrique (IRAM) (author)
Sanchez, S.Institut de Radioastronomie Millimétrique (IRAM) (author)
Vicente, P. deObservatorio de Yebes (IGN),Yebes Observatory (author)
Zensus, A.J.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG)Boston University (creator_code:org_t)

By the author/editor: Hodgson, J.; Krichbaum, T. P.; Marscher, A.; Jorstad, S.G.; Marti-Vidal, Iva ...; Lindqvist, Micha ...; show more...; Bremer, M.; Sanchez, S.; Vicente, P. de; Zensus, A.J.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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