The structure of the quasar 3C 345 at λ49 CM and its relation to low-frequency variability.

Details The structure of the quasar 3C 345 at λ49 CM and its relation to low-frequency variability. The structure of the quasar 3C 345 at λ49 CM and its relation to low-frequency variability.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312..738m&link_type=abstract

Astronomy and Astrophysics, v.312, p.738-744

Astronomy and Astrophysics

Astrophysics

9

Galaxies: Jets, Radio Continuum: Galaxies, Quasars: 3C 345

Scientific paper

The structure of the quasar 3C 345 has been studied at λ49cm with a global VLBI network. The core has a low-frequency 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 ~5x4mas and a brightness temperature of T_b_~0.6x10^12^K. Its flux density and solid angle increased by a factor of ~2 during the period 1983.9 to 1990.8, but the brightness temperature did not change significantly. The emission at millimeter wavelengths decreased by a factor of ~2 during the same period, while the UV emission from the nucleus also decreased. We suggest that variations in the low-frequency emission are caused by changes in the absorption by a cocoon - the thermal plasma surrounding the jet. The electron density in the core region is N_e_~10^5^cm^-3^ and the longitudinal component of the magnetic field is ~40μG. The emission measure and the rotation measure vary with r, the distance from the nucleus, as r^-3^. The data at λ49cm indicate several components in and near the "hotspot" at the end of the arcsec jet.

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