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  • 1
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    Cygnus A at 99 GHz - Observations of the three principal components and interpretation of the central source (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The three principal emission components of Cygnus A have been observed at 99 GHz, the highest frequency at which radio measurements of this source have been accomplished. The observations show no definite indication of a high-frequency cutoff in the spectrum of the compact central component, which perhaps may be attributed to an optically thin synchrotron source that peaks at a frequency of several hundred GHz.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 220
    Format: text
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  • 2
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    Preliminary results of linear polarization measurements at 99 GHz (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The results of the first linear polarization measurements of extrasolar radio sources at a frequency above 35 GHz are presented. For the quasars 3C 273 and 3C 345, the observed position angles are in accord with the predictions of Inoue, and the measurements are consistent with the suggestion that the compact components responsible for the high-frequency emission are affected by high degrees of internal Faraday depolarization. For the radio galaxy 3C 274 (Virgo A) the observed position angle and degree of polarization are consistent with the model of Hobbs and Waak.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 223
    Format: text
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  • 3
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    NH3 spectral line measurements on earth and Jupiter using a 10 micron superheterodyne receiver (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: ASTRONOMY
    Format: text
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  • 4
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    Nonthermal galactic emission below 10 megahertz (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The Radio Astronomy Explorer 2 (RAE 2) lunar-orbiting satellite has provided measurements of the nonthermal galactic radio emission at frequencies below 10 MHz. Measurements of the emission spectra are presented for the center, anticenter, north polar, and south polar directions at 22 frequencies between 0.25 and 9.18 MHz. Survey maps of the spatial distribution of the observed low-frequency Galactic emission at 1.31, 2.20, 3.93, 4.70, 6.55, and 9.18 MHz are presented. The observations were obtained with the 229-m traveling-wave V antenna on this lunar-orbiting spacecraft. The improved frequency coverage offers additional insights into the structure of the local Galactic neighborhood.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 221
    Format: text
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  • 5
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    C2 imagery of the inner coma of Comet IRAS-Araki-Alcock (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: May 10, 1983 observations of the comet IRAS-Araki-Alcock are analyzed to determine the spatial molecular abundance of C2 in the inner coma, via the Delta-v = +1 Swan band sequence near 4690 A. The observations indicate a deficiency of C2 emission across a projected diameter of about 2000 km that is centered on the peak of continuum emission. Comet imagery indicates a sunward-pointing coma that suggests an outburst of subsurface volatile ices through a nonvolatile surface crust, as predicted for periodic comets. These results are discussed in the framework of instrumental and observational constraints.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 63; 339-346
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  • 6
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    OH emission in the direction of TV Gem and BI Cyg (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The NRAO-Green Bank 43-m telescope and 18-cm receiver have detected OH maser main-line emission at 1665 MHz, in the direction of the two late-type supergiants TV Gem and BI Cyg. The detection of the two new OH maser sources is noteworthy in view of the small number of late-type supergiants known to be molecular radio sources, or associated in close proximity with OH emission clouds. The IR, UV and radio properties of the two stars are discussed.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 86; Dec. 198
    Format: text
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  • 7
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    Cygnus A at 99 GHz: Observations of the three principal components and interpretation of the central source (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The three principal emission components of Cygnus A were observed at 99 GHz, the highest frequency at which radio measurements of this source have been accomplished. The observations show no definite indication of a high-frequency cutoff in the spectrum of the compact central component, which perhaps may be attributed to an optically thin synchrotron source that peaks at a frequency of several hundred GHz.
    Keywords: ASTRONOMY
    Type: NASA-TM-78068 , X-685-77-272
    Format: application/pdf
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  • 8
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    Saturn radio emission near 1 MHz (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Emission from the direction of the planet Saturn was observed by the IMP-6 spacecraft at 15 frequencies between 375 and 2200 kHz during the period April 1971 to October 1972. The Saturnian radio bursts were identified in the IMP-6 data through an analysis of the phase of the observed modulated signal detected from the spinning dipole antenna. Initial data reduction has isolated approximately 12 storms whose occurrence corresponded to times in which the spacecraft had an unobstructed view in the direction of Saturn. These events persisted over periods between one and ten minutes. Over the span of 500 days of data another 10 to 20 Saturnian events may exist, but positive identification is confused by the presence of terrestrial noise as well as a geometric ambiguity with Jupiter. A power spectral analysis of the storm occurrence times indicates a weak periodicity at 10h 30m + or - 5m at some of the observing frequencies. The spectral character of the radiation was found analogous to that of Jupiter.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-70810 , X-693-75-5
    Format: application/pdf
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  • 9
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    New silicon monoxide masers (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Seven Mira variable stars with silicon monoxide maser emission have been found. All are later than M4 and heavily reddened. Two were observed near maximum light. One, Y Cas, seems to bear out the correlation of 43-GHz SiO maser luminosity and mean spectral type at maximum light. RT Aql, however, falls about 1 mag below the expected brightness. A catalog of SiO maser stars is given.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 83; Jan. 197
    Format: text
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  • 10
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    Imaging and data processing with the Low Frequency Space Array (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The Low Frequency Space Array (LFSA) is being designed to image the entire sky at extremely low radio frequencies with arcmin to subarcmin resolution. To accomplish this goal, data from LFSA will be continuously integrated for many months and then be used with aperture synthesis techniques to produce images. The three dimensional nature of LFSA and the effects of orbital geometry make LFSA a continuously evolving array which has an excellent synthesized point-response function. After transforming the data to produce an initial image, it is possible to remove low-level sidelobe responses remaining in the image and thereby produce a high dynamic-range image. Interference (both man-made and from solar-system objects) is a potential problem for LFSA, but appropriate data handling techniques are available which should eliminate any of its effects.
    Keywords: ASTRONOMY
    Format: text
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