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  • 1
    Electronic Resource
    Electronic Resource
    A new class of extragalactic radio sources with one-sided structure? (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 286-288 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The vast majority of high-luminosity (^2x 1025 W Hz"1 sr"1 at 178 MHz extragalactic radio sources, especially when selected at a low frequency (^1 GHz), have reasonably symmetric outer lobes on opposite sides of the nucleus; the median value of the distribution of the peak brightness ratio is ~3. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339286a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A compact radio source in the nucleus of M87 (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 753-755 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Optical observations of the nucleus of M87 (Virgo A, 3C274) show a central luminosity spike of size 〈 1 arc s and a velocity dispersion which increases towards the centre5'8. These data suggest the presence of a massive compact object of mass 5 x IO9 MO (réf. 5), where M0 is the solar mass. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321753a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Radio to optical spectral index variations along the M87 jet (1989)
    Springer
    Astrophysics and space science 157 (1989), S. 183-186 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract CCD photometry and MERLIN observations of M87 (Virgo A) have been used to study the variations of the radio to optical spectral index along the jet. In general, the radio spectrum is flatter than the optical one and both become steeper with distance from the nucleus. The optical fluxes of the bright knots lie at or below the extrapolation of the radio spectrum. These properties can be explained by power-law spectra at low frequencies that turn down gradually beyond a cut-off frequency. The location of the local cut-off frequency is estimated by fitting the measured fluxes to the theoretical spectrum of a truncated power-law electron energy distribution. The results are interpreted in terms of models of synchrotron emission from shock waves in extragalactic jets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637327
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    Paper (German National Licenses)
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