Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    A new method for estimating frequency-dependent core shifts in active galactic nucleus jets

    Access Status
    Open access via publisher
    Authors
    Kudryavtseva, Nadia
    Gabuzda, D.
    Aller, M.
    Aller, H.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kudryavtseva, N. and Gabuzda, D. and Aller, M. and Aller, H. 2011. A new method for estimating frequency-dependent core shifts in active galactic nucleus jets. Monthly Notices of the Royal Astronomical Society. 415 (2): pp. 1631-1637.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2011.18808.x
    ISSN
    1365-2966
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/49127
    Collection
    • Curtin Research Publications
    Abstract

    We discuss the opacity in the core regions of active galactic nuclei observed with Very Long Baseline Interferometry (VLBI), and describe a new method for deriving the frequency-dependent shifts of the VLBI core from the frequency-dependent time lags of flares observed with single-dish observations. Application of the method to the core shifts of the quasar 3C 345 shows a very good agreement between the core shifts directly measured from VLBI observations and derived from flares in the total flux density using the proposed method. The frequency-dependent time lags of flares can be used to derive physical parameters of the jets, such as distance from the VLBI core to the base of the jet and the magnetic fields in the core region. Our estimates for 3C 345 indicate core magnetic fields ≃0.1 G and magnetic field at 1 pc ≃ 0.4 G.

    Related items

    Showing items related by title, author, creator and subject.

    • Dual-frequency VLBI study of Centaurus A on sub-parsec scales. The highest-resolution view of an extragalactic jet
      Müller, C.; Kadler, M.; Ojha, R.; Wilms, J.; Bock, M.; Edwards, P.G.; Fromm, C.M.; Hase, H.; Horiuchi, S.; Katz, U.; Lovell, J.E.J.; Plötz, C.; Pursimo, T.; Richers, S.; Ros, E.; Rothschild, R.E.; Taylor, G.B.; Tingay, Steven; Zensus, J.A. (2011)
      Context: Centaurus A is the closest active galactic nucleus. High resolution imaging using Very Long Baseline Interferometry (VLBI) enables us to study the spectral and kinematic behavior of the radio jet–counterjet system ...
    • VLBI imaging throughout the primary beam using accurate UV shifting
      Morgan, John; Mantovani, F.; Deller, A.; Brisken, W.; Alef, W.; Middelberg, E.; Nanni, M.; Tingay, Steven (2011)
      For Very Long Baseline Interferometry (VLBI), the fringe spacing is extremely narrow compared to the field of view imposed by the primary beam of each element. This means that an extremely large number of resolution units ...
    • Frequency dependent digital compensation in DSP based FM modulators.
      Tuthill, John D. (2000)
      This thesis reports original work on digital compensation for frequency dependent transfer characteristics and errors in digital PAM/CPFSK (Pulse Amplitude Modulation/Continuous Phase Frequency Shift Keying) quadrature ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.