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  • 1
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    Search for X-ray emission from bursting radio sources (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Results are reported for a systematic search with the A-2 experiment aboard HEAO 1 for X-ray emission from 28 radio sources that were actually bursting at the epoch of the X-ray observations. Two of these sources are found to lie within the positional errors of X-ray sources: the moderately redshifted quasars NRAO 140 and NRAO 530. The positions of 30 historically variable radio sources that were not active at the time of the search are compared with those of detectable X-ray sources, but no X-ray emission is detected from any of these positions. The implications of the results are discussed in terms of models for the radio emission from compact extragalactic sources. Several possible explanations are presented for the general absence of Compton X-ray emission from the bursting radio sources surveyed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 233
    Format: text
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  • 2
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    Search for correlated radio and optical events in long-term studies of extragalactic sources (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: For the first time, long-term records of radio and optical fluxes of a large sample of variable extragalactic sources have been assembled and compared, with linear cross-correlation analysis being used to reinforce the visual comparisons. Only in the case of the BL Lac object OJ 287 is the correlation between radio and optical records strong. In the majority of cases there is no evidence of significant correlation, although nine sources show limited or weak evidence of correlation. The results do not support naive extrapolation of the expanding source model. The general absence of strong correlation between the radio and optical regions has important implications for the energetics of events occurring in such sources.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal; 81; July 197
    Format: text
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  • 3
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    New far infrared observations of the central 30 arcmin of the Galaxy (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Observations of the 55 micron and 125 micron emissions of the central 30 arcmin of the Galaxy were performed with 1 arcmin resolution with instrumentation on-board the Kuiper flying observatory. The flux distributions detected showed both wavelengths with peaks near the galactic center, some extension along the galactic plane, and the 125 micron feature located 30 arcsec south. An asymmetry was found around Sgr A, and the variation in dust temperature across the region was calculated from the ratio of the two wavelengths. The temperature peak was around Sgr A, with subsidiary peaks associated with the 55 micron emission. A common heating source was indicated by correlations between cm wavelength sources and the temperature maps. Additionally, the distributions of NH3 and formaldehyde were also correlated with the dust distribution at the center.
    Keywords: ASTROPHYSICS
    Type: The galactic center; Proceedings of the Workshop, Pasadena; Jan 07, 1982 - Jan 08, 1982; Pasadena, CA
    Format: text
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