{
  "id": "1910.02661",
  "version": "v1",
  "published": "2019-10-07T08:22:02.000Z",
  "updated": "2019-10-07T08:22:02.000Z",
  "title": "Exploring the Morphology and Origins of the 4C 38.41 Jet",
  "authors": [
    "Juan Carlos Algaba",
    "Bindu Rani",
    "Sang-Sung Lee",
    "Motoki Kino",
    "Jongho Park",
    "Jae-Young Kim"
  ],
  "comment": "8 pages, 8 figures, accepted for publication in ApJ",
  "categories": [
    "astro-ph.GA",
    "astro-ph.HE"
  ],
  "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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-10-07T08:22:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "morphology",
      "boston university vlbi program",
      "flat spectrum radio quasar",
      "semi-parabolic jet geometry",
      "jet geometry break"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}