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The structure of th...
The structure of the quasar 3C345 at lambda 49cm and its relation to low-frequency variability
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- Matveenko, L.I. (author)
- Space Research Institute, Profsojuznaja 84/32, Moscow 117810, Russian Federation
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- Pauliny-Toth, L.I.K. (author)
- Max-Planck-Inst. F. Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
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- Bååth, Lars, 1948- (author)
- Högskolan i Halmstad,Rydberglaboratoriet för tillämpad naturvetenskap (RLAS)
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- Graham, D.A. (author)
- Max-Planck-Inst. F. Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
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- Sherwood, W.A. (author)
- Max-Planck-Inst. F. Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
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- Kus, A.J. (author)
- Torun Radio Astronomy Observatory, Gagarina 11, PL-87100 Torun, Poland
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Space Research Institute, Profsojuznaja 84/32, Moscow 117810, Russian Federation Max-Planck-Inst F. Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany (creator_code:org_t)
- Berlin : Springer-Verlag, 1996
- 1996
- English.
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In: Astronomy and Astrophysics. - Berlin : Springer-Verlag. - 0004-6361 .- 1432-0746. ; 312, s. 738-744
- Related links:
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https://hh.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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Abstract
Subject headings
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- 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.
Keyword
- galaxies:jets
- radio continuum: galaxies
- quasars: 3C345
- NATURAL SCIENCES
- NATURVETENSKAP
Publication and Content Type
- ref (subject category)
- art (subject category)
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