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  • 2000-2004  (2)
  • Physik  (2)
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  • 2000-2004  (2)
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  • Physik  (2)
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  • 1
    Online-Ressource
    Online-Ressource
    A Helical Magnetic Field in the Jet of 3C 273
    Oxford University Press (OUP) ; 2002
    In:  Publications of the Astronomical Society of Japan Vol. 54, No. 3 ( 2002-06-25), p. L39-L43
    Details
    In: Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 54, No. 3 ( 2002-06-25), p. L39-L43
    Kurzfassung: Both in the Faraday Rotation Measure and the intrinsic polarization angle, new features are revealed to indicate a helical magnetic field operating along the jet of the bright active galactic nucleus 3C 273. The helical field has been suggested to be related to the formation and collimation of jets by magnetohydrodynamic models. The distribution of the rotation measure shows a systematic gradient with respect to the jet axis, which is expected by a helical magnetic field. In addition, the helical field can consistently explain two types in the direction of the projected magnetic field: parallel and perpendicular to the jet axis. Further, if the helical magnetic field is generated by winding up of an initial field by rotation of the accretion disk, we can uniquely determine the direction of the disk rotation, since the jet is approaching us.
    Materialart: Online-Ressource
    ISSN: 2053-051X , 0004-6264
    URL: Article
    DOI: 10.1093/pasj/54.3.L39
    RVK:
    US 1090
    Sprache: Englisch
    Verlag: Oxford University Press (OUP)
    Publikationsdatum: 2002
    ZDB Id: 2206640-8
    ZDB Id: 2083084-1
    SSG: 16,12
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    A New Test for the Absorption Mechanism of GPS Radio Sources Using Polarization Properties
    Oxford University Press (OUP) ; 2002
    In:  Publications of the Astronomical Society of Japan Vol. 54, No. 1 ( 2002-02-25), p. 131-138
    Details
    In: Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 54, No. 1 ( 2002-02-25), p. 131-138
    Kurzfassung: We consider the use of polarization properties as a means to discriminate between Synchrotron Self-Absorption (SSA) and Free–Free Absorption (FFA) in GHz-Peaked Spectrum (GPS) sources. The polarization position angle (PA) of synchrotron radiation at high frequencies for the optically thin regime is perpendicular to the magnetic field, whereas it is parallel to the magnetic field at low frequencies for the optically thick regime. Therefore, SSA produces a change in PA of $90^{\circ}$ across the spectral peak, while FFA does not result in such a change. We analyzed polarization data from VLA observations for six GPS sources to see if such a change in PA was present. Our results indicate that there is no significant evidence for $90^{\circ}$ change in PA across the spectral peak, suggesting that FFA is more likely than SSA for low-frequency cutoffs in these sources.
    Materialart: Online-Ressource
    ISSN: 2053-051X , 0004-6264
    URL: Article
    DOI: 10.1093/pasj/54.1.131
    RVK:
    US 1090
    Sprache: Englisch
    Verlag: Oxford University Press (OUP)
    Publikationsdatum: 2002
    ZDB Id: 2206640-8
    ZDB Id: 2083084-1
    SSG: 16,12
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
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