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The structure of the quasar 3C345 at lambda 49cm and its relation to low-frequency variability
Space Research Institute, Profsojuznaja 84/32, Moscow 117810, Russian Federation.
Max-Planck-Inst. F. Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.
Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).ORCID iD: 0000-0002-4826-019X
Max-Planck-Inst. F. Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.
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1996 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 312, p. 738-744Article in journal (Refereed) Published
Abstract [en]

The structure of the quasar 3C345 has been studied at lambda 49cm with a global VLBI network. The core has a low-freuqncy cut off in its spectrum, and is very weak at this wavelength. The most compact bright knot is the part of the jet nearest to the nucleus, with a size of about 5x4 mas and a brightness temperature of Tb about 0.6 10^12 K. Its flux density and solid angle increased by a factor of about 2 during the period 1983.9 to 1990.8, but the birghtness temperature did not change significantly. The emission at millimeter wavelengths decreased by a factor of about 2 during the same period, while the UV emission from the nucleus also dcreased. We suggest that variations in the low-frequency emissions are caused by changes in the absorption by a cocoon - the thermal plasma surrounding the jet. The electron density in the region is Ne about 10^5 cm^-3and the longitudal field is about 40 microG. The emission measure and the rotation measure vary with r, the distance from the nucleus as r^-3. The data at lamda 49cm indi´cate several components in and near the "hotspot" at the end of the arcsec jet.

Place, publisher, year, edition, pages
Berlin: Springer-Verlag , 1996. Vol. 312, p. 738-744
Keywords [en]
galaxies:jets, radio continuum: galaxies, quasars: 3C345
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Natural Sciences
Identifiers
URN: urn:nbn:se:hh:diva-1875ISI: A1996VE34400007Scopus ID: 2-s2.0-0000705162Local ID: 2082/2270OAI: oai:DiVA.org:hh-1875DiVA, id: diva2:239093
Available from: 2008-09-10 Created: 2008-09-10 Last updated: 2018-09-11Bibliographically approved

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