{
  "id": "0904.2458",
  "version": "v1",
  "published": "2009-04-16T10:04:57.000Z",
  "updated": "2009-04-16T10:04:57.000Z",
  "title": "Opacity in parsec-scale jets of active galactic nuclei: VLBA study from 1.4 to 15 GHz",
  "authors": [
    "Y. Y. Kovalev",
    "A. B. Pushkarev",
    "A. P. Lobanov",
    "K. V. Sokolovsky"
  ],
  "comment": "6 pages, 3 figures, to appear in Proceedings of Science, Proceedings of The 9th European VLBI Network Symposium on The role of VLBI in the Golden Age for Radio Astronomy and EVN Users Meeting",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "In extragalactic jets, the apparent position of the bright/narrow end (the core) depends on the observing frequency, owing to synchrotron self-absorption and external absorption. The effect must be taken into account in order to achieve unbiased results from multi-frequency VLBI data on AGN jets. Multi-frequency core shift measurements supplemented by other data enable estimating the absolute geometry and a number of fundamental physical properties of the jets and their environment. We have previously measured the shift between 13 and 3.6 cm in a sample of 29 AGNs to range between 0 and 1.4 mas. In these proceedings, we present and discuss first results of our follow-up study using VLBA between 1.4 and 15.4 GHz.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-04-16T10:04:57.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "active galactic nuclei",
      "vlba study",
      "parsec-scale jets",
      "multi-frequency core shift measurements",
      "multi-frequency vlbi data"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 818079,
      "adsabs": "2008evn..confE...7K"
    }
  }
}