Exploring the Morphology and Origins of the 4C 38.41 Jet

Abstract

We study the properties of the innermost jet of the flat spectrum radio quasar 1633+382 (4C~38.41) based on VLBI data from the radio monitoring observations of the Boston University VLBI program at 43~GHz. Analysis of the components suggests a semi-parabolic jet geometry with jet radius $R$ following the relation $R\propto r^{0.7}$ with distance $r$, with indications of a jet geometry break towards a conical geometry. Brightness temperature falls with distance following $T_B\propto r^{-2.1}$. Combining this information, magnetic field and electron densities are found to fall along the jet as $B\propto r^{-1.5}$ and $n\propto r^{-1.1}$ respectively, suggesting that the magnetic configuration in the jet may be dominated by the poloidal component. Our analysis of the jet structure suggests that the innermost jet regions do not follow a ballistic trajectory and, instead, match a sinusoidal morphology which could be due to jet precession from a helical pattern or Kelvin-Helmholtz instabilities.

8 pages, 8 figures, accepted for publication in ApJ

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• Collimation of the relativistic jet in the quasar 3C 273
• Interpreting the variation phenomena of B2 1633+382 via the two-component model
• Jet Collimation and Acceleration in the Flat Spectrum Radio Quasar 1928+738
• MOJAVE -- XXII. Brightness temperature distributions and geometric profiles along parsec-scale AGN jets
• Multiwavelength analysis and the C IV λ1549 Å emission line behavior from 2008 to 2020 of the FSRQ B2 1633+382
• Parabolic jet shape on parsec scales in high redshift AGN
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• Simulations of linear polarization of precessing AGN jets at parsec scales