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  • ASTROPHYSICS  (3)
  • Cell & Developmental Biology
  • Nerves, degeneration
  • 1985-1989  (3)
  • 1960-1964
  • 1945-1949
  • 1985  (3)
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Keywords
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  • 1985-1989  (3)
  • 1960-1964
  • 1945-1949
Year
  • 1
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    Kinematics and ionization of extended ionized gas in active galaxies. I - The X-ray luminous galaxies NGC 2110, NGC 5506, and MCG -5-23-16 (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Direct CCD imaging and long-slit Vidicon spectroscopy have been used to map the emission-line ratios, profiles, and velocity fields over the extended narrow-line regions in three nearby Seyfert galaxies, NGC 2110, NGC 5506, and MCG -5-23-16. The gas in the letter is spatially unresolved. Similarities between the other two nebulae include the excitation mechanism (photoionization by a central nonthermal source) and the overall profiles of the very broad emission lines close to the nucleus. The nebulae are, however, quite different in their global kinematic behavior. In NGC 2110, the gas appears to lie in a disk or flattened spheroid and to be in ordered rotation, with a classical rotation curve, about an axis parallel to the minor axis of the stellar isophotes. The velocity field of NGC 5506 is quite irregular, but a component of rotation in the plane of the galaxy seems to exist.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 291; 627-654
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    X-ray emission from E and S0 galaxies with compact nuclear radio sources (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The imaging proportional counter on the Einstein Observatory has been used to search for X-ray emission from 13 nearby E and S0 galaxies with compact nuclear radio sources. Five galaxies with X-ray luminosity of about 10 to the 41st ergs/s were detected, and one of them was resolved. These galaxies and a few similar ones observed by others are compared to a sample of radio-quiet E and S0 galaxies. The radio-emitting galaxies have consistently greater X-ray luminosities per unit of optical luminosity than most radio-quiet galaxies. Possible emission mechanisms and models for the resolved source, for the most powerful source, and for the class of E/S0 galaxies with active nuclei are discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 291; 668-676
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    NGC 2110 - A Seyfert and X-ray elliptical galaxy with displaced kinematic and light centers (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Kinematic and imaging observations of NGC 2110 are reported and it is found that the interstellar gas is orbiting with projected rotation axis parallel to the minor axis of the stellar light. The rotation curve is steep close to the center and flat farther out. However, the nucleus is displaced by about 220 pc from the apparent mass center of the galaxy. This last result is discussed in terms of models invoking differential obscuration of stars and gas, non-Keplerian motion of the gas, or a large mass of unseen material which dominates the rotation curve.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 289; 124-128
    Format: text
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    NASA TECHNICAL REPORTS
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