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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1301.6873 (astro-ph)
[Submitted on 29 Jan 2013]

Title:AGN astrophysics from comparing radio and Gaia optical astrometry

Authors:Ian Browne
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Abstract:Gaia will open up a huge volume of new parameter space in which to explore the physics of AGN and black hole evolution. We address the question as to how far along the relativistic jets blazar radio, optical and gamma ray emission originated. In some models the optical centroid wander should be detectable as the relative contributions of thermal and non-thermal optical emission change. Black holes powering AGN do not necessarily reside at the centres of their host galaxies; they can be one member of a binary pair or they could have received a kick after binary coalescence. For radio-loud AGN comparison of astrometric radio and and optical positions can reveal such displacements. It is suggested that it would be feasible to do this using Gaia and e-MERLIN for a sample of thousands of elliptical radio galaxies.
Comments: 5 pages, GREAT-ESF workshop on QSO astrophysics, fundamental physics and astrometric cosmology in the Gaia era. Porto, June 2011
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1301.6873 [astro-ph.CO]
  (or arXiv:1301.6873v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1301.6873
Journal reference: Mem S. A. It, 2012, 83, 925

Submission history

From: I. W. A. Browne [view email]
[v1] Tue, 29 Jan 2013 09:38:29 UTC (730 KB)
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