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  • 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
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  • 2
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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
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  • 3
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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
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  • 4
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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
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  • 5
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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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  • 6
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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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  • 7
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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
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  • 8
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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
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  • 9
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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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  • 10
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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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