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  • ASTROPHYSICS  (6)
  • 2015-2019
  • 1985-1989  (6)
  • 1945-1949
  • 1989  (4)
  • 1986  (2)
  • 1948
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  • 2015-2019
  • 1985-1989  (6)
  • 1945-1949
Year
  • 1
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    4U1722 + 11 - The discovery of an X-ray selected BL Lac object (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Uhuru X-ray source 4U1722 + 11 was observed using the microchannel-plate detector (High Resolution Imager) on the Einstein Observatory, and its coordinates measured to a precision of about 5 arcsec. A 16th-magnitude stellar object within the error circle was observed spectroscopically at CTIO, and at the AAT, and found to have a featureless continuum. Subsequent radio observations at the VLA have established that the object is a radio source at the level of 60 mJy, and optical polarization measurements have determined that the source exhibits variable polarization at the level of 10 percent. On the basis of these observations, it is concluded that 4U1722 + 11 is a member of the class of objects known as X-ray selected blazars of BL Lac objects.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 240; 33-39
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A millimeter-wave survey of CO emission in Seyfert galaxies (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Emission in the 115 GHz 1-0 line of CO has been detected in 18 Seyfert galaxies in a sample of 43. The CO properties of 29 Seyferts in the Revised Shapley Ames Catalog (RSA) are compared with the CO properties of normal galaxies of the same Hubble type. These RSA type 2 Seyferts have an average ratio of CO-to-blue luminosity that is about twice as large as that of the normal galaxies, but the RSA type 1 Seyferts have normal CO luminosities. The RSA type 2 Seyfert galaxies have an unusually large average ratio of CO luminosity-to-H I mass compared to normal disk galaxies. The RSA type 2 Seyferts have an average far-IR luminosity that is about four times larger than a non-Seyfert comparison sample, while the RSA type 1 Seyferts are not significantly more luminous than the non-Seyferts. The result imply that the two classes of Seyferts are intrinsically different from one another and that one class cannot evolve into another in less than a few million years.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 342; 735-758
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    NASA TECHNICAL REPORTS
  • 3
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    Kinematics and ionization of extended gas in active galaxies. V - The Seyfert galaxy NGC 5548 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: It is found that NGC 5548 contains a spatially extended high-excitation narrow-line region with line widths ranging between 500 and 100 km/s (FWHM). This nebulosity is elongated along the axis of the triple radio source. The peak of optical continuum light (nucleus) coincides with the peak of the forbidden O III 5007 A distribution.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 339; 729-741
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  • 4
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    0714 - 2914 (M4-1) - Another Seyfert galaxy with aligned radio continuum and optical emission-line morphologies (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Direct imaging and long-slit spectroscopic mapping of the emission-line gas in the Seyfert 2 galaxy 0714 - 2914 (M4-1, MCG - 5-18-2) are reported. The nuclear regions contain an extended (1 kpc size), high-excitation nebulosity that is well aligned with the jet-like nonthermal radio source. The profiles of Forbidden O III 5007A are asymmetric, with extended red wings to the north and west of the nucleus and extended blue wings to the south and east. This switch in the sense of asymmetry is accounted for in terms of a combination of normal rotational motions in the galaxy disk and high-velocity outflow or infall associated with the Seyfert activity.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 98; 2056-206
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  • 5
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    The radio source in the very luminous gamma-ray Seyfert galaxy MCG 8-11-11 (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: VLA high resolution observations of the Seyfert 1.5 galaxy MCG 8-11-11 at 2 and 6 cm show the center of the galaxy to contain a triple radio source of 400 pc, with a less than 30-pc diameter central component that may be identified as the center of the galaxy. The triple source is in turn embedded in more diffuse emission which has a major axis position angle similar to that in the optical galaxy, but differing from the position angle of the triple source by 50 deg. While the overall morphology of the source is S-shaped, the curvature of the triple source at the ends is abrupt rather than continuous and gradual. It appears that the core radio emission in Seyfert 1 and 1.5 galaxies may be weakly correlated with their X-ray emission.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 218; 711-719
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  • 6
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    X-ray observations of supernova remnants resembling the Crab Nebula (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Out of the three SNRs G291.0 - 0.1, G308.7 + 0.0, and G328.4 + 0.2, which resemble the Crab Nebula in many of their radio properties, the present Einstein Observatory search was able to detect only the first, which is noted to have very extended X-ray emission with strong central brightening. Given the large distances and hydrogen column densities of the other two SNRs, their X-ray limits are consistent with membership in the Crab Nebula-like group. The evolutions of radio luminosity, X-ray luminosity, and the ratio of the two luminosities with remnant diameter are reassessed for this SNR class. No evidence is found for a radio luminosity decrease with diameter (age).
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 302; 718-726
    Format: text
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