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  • ASTROPHYSICS  (2)
  • Cell & Developmental Biology
  • GEOPHYSICS
  • Nerves, degeneration
  • 1985-1989  (2)
  • 1960-1964
  • 1945-1949
  • 1988  (2)
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  • 1985-1989  (2)
  • 1960-1964
  • 1945-1949
Year
  • 1
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    Star formation and nuclear activity in Seyfert galaxies (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A probable correlation between radio structure and IRAS spectrum in Seyfert galaxies is reported. For Seyfert galaxies known to exhibit the observational characteristics of vigorous star formation, the correlation between 1.4 GHz and 60 micron fluxes is in excellent agreement with that found for other extragalactic star formation regions. The far-IR radiation observed by IRAS from these galaxies is predominantly thermal emission from dust heated by hot stars. On the other hand, Seyfert galaxies with radio emission dominated by 'linear' structures tend to have relatively flat 25-100 micron spectra, and the ratio of their 1.4 GHz to 60 micron flux densities is considerably higher than that for star-forming regions. The radio and far-IR emission from this class appear to be dominated by the Seyfert nucleus, with the far-IR originating directly from a nonthermal source or from dust heated by one.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 206; 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Kinematics and ionization of extended gas in active galaxies. IV - The Seyfert 2 galaxy NGC 4388 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The results of direct CCD imaging and long-slit medium-dispersion spectroscopy of the extended narrow-line-emitting gas in the nearby Seyfert 2 galaxy NGC 4388 are presented. The spectra are used to investigate the distribution, kinematics, and ionization structure of the excited gas in the regions surrounding the nucleus out to a distance of about 4.8 kpc. The data support earlier suggestions that the galaxy, which appears to lie near the core of the Virgo cluster, has been tidally distorted, possibly by the nearby cluster core galaxies M84 or IC 3303. Much of the highly ionized gas in the galaxy appears to be distributed in two wide cones originating from the nucleus and extending above and below the disk. Explanations are offered for the distribution of this gas and for the remainder of the gas above and below the disk.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 334; 584-596
    Format: text
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    NASA TECHNICAL REPORTS
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