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  • 1995-1999  (1)
  • 1990-1994  (2)
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  • 1995-1999  (1)
  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    A geometric distance to the galaxy NGC4258 from orbital motions in a nuclear gas disk (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 539-541 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The accurate measurement of extragalactic distances is a central challenge of modern astronomy, being required for any realistic description of the age, geometry and fate of the Universe. The measurement of relative extragalactic distances has become fairly routine, but estimates of absolute ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/22972
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Extremely-high-velocity H 2 0 maser emission in the galaxy NGC4258 (1993)
    [s.l.] : Nature Publishing Group
    Nature 361 (1993), S. 45-47 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] NGC4258 is a spiral galaxy at a distance of 6.6 Mpc (ref. 7) with unusual 7-kpc-long bipolar jets or bubbles of radio continuum emission8"10. Extremely luminous water-vapour masers of -100 times the luminosity of the Sun, LQ (ref. 3), have been detected within 1 parsec (3xl018cm) of its nucleus6. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/361045a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The starburst in the Wolf-Rayet nucleus of the Liner NGC 6764 (1993)
    Springer
    Astrophysics and space science 205 (1993), S. 29-35 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present high resolution millimeter, near-infrared, and optical data on the Wolf-Rayet nucleus of the Liner NGC 6764. The millimeter12CO(1-0) maps were obtained using the Nobeyama Millimeter Interferometer. Near-infrared images in the K-band continuum and the 2.12µm H2, 2.06µm He I, 2.17µm Brγ, and 1.64µm [Fe II] lines were taken with the MPE imaging spectrometer FAST at the William Herschel Telescope on La Palma, Spain. The optical data were obtained at the 3.5m telescope on Calar Alto, Spain. The measurements indicate a strong concentration of molecular gas and a massive starburst at the nucleus of NGC 6764. The interferometric position velocity map of the nucleus shows the presence of distinct molecular cloud complexes with an apparently asymmetric velocity field shifted towards the blue with respect to the systemic velocity of 2420 km s−1. The distribution of the 2.12µm H2 line flux exhibits extensions approximately perpendicular to the bar which are in agreement with structural features in VLA radio maps and IRAM 30m maps of the12CO(2–1) line emission. This may represent evidence for combination of a nuclear outflow and a central oval distortion of gas predicted by gas dynamical calculations as a response to a bar like potential. A detailed investigation of the Wolf-Rayet-feature at 466 nm indicates that it is spatially extended on a scale of a few arcseconds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657953
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    Paper (German National Licenses)
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