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First 230?: GHz VLBI fringes on 3C 279 using the APEX Telescope (Research Note)
Max Planck Institute for Radio Astronomy, Germany.
Max Planck Institute for Radio Astronomy, Germany.
Max Planck Institute for Radio Astronomy, Germany.
Max Planck Institute for Radio Astronomy, Germany.
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2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 581, article id A32Article in journal (Refereed) Published
Abstract [en]

Aims. We report about a 230? GHz very long baseline interferometry (VLBI) fringe finder observation of blazar 3C 279 with the APEX telescope in Chile, the phased submillimeter array (SMA), and the SMT of the Arizona Radio Observatory (ARO). Methods. We installed VLBI equipment and measured the APEX station position to 1? cm accuracy (1σ). We then observed 3C 279 on 2012 May 7 in a 5? h 230? GHz VLBI track with baseline lengths of 2800? Mλ to 7200? Mλ and a finest fringe spacing of 28.6? μas. Results. Fringes were detected on all baselines with signal-to-noise ratios of 12 to 55 in 420? s. The correlated flux density on the longest baseline was ∼0.3? Jy beam-1, out of a total flux density of 19.8? Jy. Visibility data suggest an emission region ≤ 38? μas in size, and at least two components, possibly polarized. We find a lower limit of the brightness temperature of the inner jet region of about 1010? K. Lastly, we find an upper limit of 20% on the linear polarization fraction at a fringe spacing of ∼ 38? μas. Conclusions. With APEX the angular resolution of 230? GHz VLBI improves to 28.6? μas. This allows one to resolve the last-photon ring around the Galactic Center black hole event horizon, expected to be 40? μas in diameter, and probe radio jet launching at unprecedented resolution, down to a few gravitational radii in galaxies like M 87. To probe the structure in the inner parsecs of 3C 279 in detail, follow-up observations with APEX and five other mm-VLBI stations have been conducted (March 2013) and are being analyzed.

Place, publisher, year, edition, pages
EDP Sciences , 2015. Vol. 581, article id A32
Keywords [en]
Galaxies: individual: 3C 279, Galaxies: jets, Instrumentation: high angular resolution, Telescopes, Galaxies, Radio astronomy, Radio telescopes, Signal to noise ratio, Angular resolution, Brightness temperatures, Galaxies: individuals, Galaxies:jets, Instrumentation:high angular resolution, Linear polarization, Submillimeter array, Very long baseline interferometry, Fighter aircraft
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-43926DOI: 10.1051/0004-6361/201423613Scopus ID: 2-s2.0-84940665971OAI: oai:DiVA.org:ri-43926DiVA, id: diva2:1392984
Available from: 2020-02-14 Created: 2020-02-14 Last updated: 2024-05-15Bibliographically approved

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Johansson, Jan M

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