Global millimeter VLBI array survey of ultracompact extragalactic radio sources at 86 GHz
Review article, 2019

Context. Very long baseline interferometry (VLBI) observations at 86 GHz (wavelength, λ = 3 mm) reach a resolution of about 50 μas, probing the collimation and acceleration regions of relativistic outflows in active galactic nuclei (AGN). The physical conditions in these regions can be studied by performing 86 GHz VLBI surveys of representative samples of compact extragalactic radio sources. Aims. To extend the statistical studies of compact extragalactic jets, a large global 86 GHz VLBI survey of 162 compact radio sources was conducted in 2010-2011 using the Global Millimeter VLBI Array (GMVA). Methods. The survey observations were made in a snapshot mode, with up to five scans per target spread over a range of hour angles in order to optimize the visibility coverage. The survey data attained a typical baseline sensitivity of 0.1 Jy and a typical image sensitivity of 5 mJy beam-1, providing successful detections and images for all of the survey targets. For 138 objects, the survey provides the first ever VLBI images made at 86 GHz. Gaussian model fitting of the visibility data was applied to represent the structure of the observed sources and to estimate the flux densities and sizes of distinct emitting regions (components) in their jets. These estimates were used for calculating the brightness temperature (Tb) at the jet base (core) and in one or more moving regions (jet components) downstream from the core. These model-fit-based estimates of Tb were compared to the estimates of brightness temperature limits made directly from the visibility data, demonstrating a good agreement between the two methods. Results. The apparent brightness temperature estimates for the jet cores in our sample range from 2.5 × 109 K to 1.3 × 1012 K, with the mean value of 1.8 × 1011 K. The apparent brightness temperature estimates for the inner jet components in our sample range from 7.0 × 107 K to 4.0 × 1011 K. A simple population model with a single intrinsic value of brightness temperature, T0, is applied to reproduce the observed distribution. It yields T0 = (3.77-0.14+0.10) × 1011 K for the jet cores, implying that the inverse Compton losses dominate the emission. In the nearest jet components, T0 = (1.42-0.19+0.16) × 1011 K is found, which is slightly higher than the equipartition limit of ∼5 × 1010 K expected for these jet regions. For objects with sufficient structural detail detected, the adiabatic energy losses are shown to dominate the observed changes of brightness temperature along the jet.

Quasars: general

Galaxies: jets

Radio continuum: galaxies

Techniques: interferometric

Galaxies: active

Surveys

Author

Dhanya G. Nair

Max Planck Institute

A. P. Lobanov

Max Planck Institute

Universität Hamburg

T.P. Krichbaum

Max Planck Institute

Eduardo Ros

Max Planck Institute

A.J. Zensus

Max Planck Institute

Yuri Y. Kovalev

Moscow Institute of Physics and Technology

Russian Academy of Sciences

Max Planck Institute

Sang Sung Lee

Korea Astronomy and Space Science Institute

Florent Mertens

Netherlands Institute for Space Research (SRON)

Yoshiaki Hagiwara

Toyo University

M. Bremer

Institut de RadioAstronomie Millimetrique (IRAM)

Michael Lindqvist

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Onsala Space Observatory, Observation Support

P. de Vicente

Spanish National Observatory (OAN)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 622 A72

Subject Categories

Astronomy, Astrophysics and Cosmology

Geophysics

Probability Theory and Statistics

DOI

10.1051/0004-6361/201833122

More information

Latest update

5/21/2019