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  • 1
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    Confining hot spots in 3C 196 - Implications for QSO-companion galaxies (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: VLBI observations of the extremely compact hot spot in the northern radio lobe of the QSO 3C 196 reveal the angular size of its smallest substructure to be 0.065 arcsec x 0.045 arcsec or about 300 pc at the redshift distance. The morphology of the hot spot and its orientation relative to the more diffuse radio emission suggest that it is formed by an oblique interaction between the nuclear QSO jet and circum-QSO cloud. The inferred density in this cloud, together with its apparent size, imply that the cloud contains a galactic mass, greater than a billion solar masses of gas. The effect of the jet will be to hasten gravitational collapse of the cloud. If many QSOs such as 3C 196 are formed or found in gas-rich environments, the QSO radio phase may commonly stimulate the metamorphosis of circum-QSO gas to QSO-companion galaxies or it may play a significant part in catalyzing star formation in existing companions.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 306; 107-109
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  • 2
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    An attempt to detect mass loss from Alpha Lyrae with the VLA (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The interpretation of the infrared excess from Alpha Lyrae as seen by the Infrared Astronomy Satellite in terms of thermal emission from a circumstellar shell of large particles follows from the recognition that small dust grains would be removed from the vicinity of the star by radiation pressure and Poynting-Robertson drag. However, this explanation is viable only if there is no resupply of small grains via mass loss from Alpha Lyr itself. Radio-continuum observations were used to constrain the stellar mass loss to less than 3.4 x 10 to the -10th solar mass/yr. The observations thus support the conclusion that the infrared excess is due to residual solid matter from the prestellar nebula.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 294; 646-648
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  • 3
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    Temperature of comet IRAS-Araki-Alcock (1983d) (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Comet 1983d was named IRAS-Araki-Alcock in honor of its codiscoverers, including the Infrared Astronomical Satellite (IRAS) and two amateur astronomers. It is pointed out that the apparition of Comet 1983d was the closest cometary approach to earth since the development of modern astronomy. Because of the evolution of electromagnetic detector technology, a large range of ground-based observations of this object were possible. In the present investigation, attention is given to observations and some interpretations of the spectrum of Comet IRAS-Araki-Alcock in the wavelength region from 1.5 to 20 microns. In addition to the observations made with a bolometer and discrete filters, spectrophotometric observations were made of the nuclear condensation of Comet 1983d in the 1.5- to 2.6-micron wavelength region at 5 percent resolution.
    Keywords: ASTROPHYSICS
    Type: Icarus (ISSN 0019-1035); 62; 273-281
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  • 4
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    A new interstellar polyatomic molecule - Detection of propynal in the cold cloud TMC-1 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The detection of the acetylene derivative propynal in the cold cloud TMC-1, with an abundance that is very close to that for the related species tricarbon monoxide, is reported. Propadienone, an isomer of propynal, was not detected and is hence less abundant than either C3O or HC2CHO.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 335; L89-L93
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  • 5
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    New interstellar masers in nonmetastable ammonia (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The first astronomical detections of several ammonia inversion transitions involving nonmetastable levels with energies as high as 1090 K above the ground state are reported. The (J, K) = (9, 6) inversion transition shows maser-like emission in the directions of W51, NGC 7538, W49, and DR 21(OH). The NH3 (6, 3) line exhibits similar characteristics in W51 but is seen in absorption in NGC 7538. These are the first definite detections of ammonia masers in space. The intensities and narrow line widths (0.5-1.5 km/s) for the emission features are in contrast to the previously detected broad, weak, nonmetastable lines attributed to thermal emission in these sources. Temporal variability appears to be evident in the (9, 6) emission in W49 over a 4 month period. The highly excited (J, K) = (9, 6) and (6, 3) ammonia lines are found in regions containig compact H II regions and strongly infrared sources with associated H2O and OH masers; i.e., in regions of active star formation.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 300; L79-L84
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  • 6
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    The size of the z = 0.437 H I absorption region toward the QSO 3C 196 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: VLBI spectral line observations made at the frequency of the z = 0.437 H I absorption line toward the extended radio QSO 3C 196 demonstrate that the absorption does not occur against the more compact continuum structure in this object. Apparently the H I absorption line results from absorption of the lower brightness continuum emission by an intervening cloud with an angular diameter which must be greater than 0.63 arcsec. For a standard cosmology, this corresponds to a linear extent greater than 2.25 kpc. For a spherical cloud, the mass of absorbing gas is near 7 x 10 to the 7th solar masses. Thus this particular QSO absorbing cloud is surprisingly large and massive.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 329; 138-141
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