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  • Other Sources  (3)
  • 1990-1994  (3)
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  • 1
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    Unknown
    Astrophysical masers; Proceedings of the Conference, Arlington, VA, Mar. 9-11, 1992 (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Various papers on astrophysical masers are presented. The general topics addressed include: theory, maser surveys, extragalactic masers, masers in star-forming regions (general), OH masers in star-forming regions, water masers in star-forming regions, methanol masers in star-forming regions, proper motions, scattering, variability, circumstellar masers (general), circumstellar OH masers, circumstellar water masers, circumstellar SiO masers, and solar system masers.
    Keywords: ASTROPHYSICS
    Type: ; 499 p.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Rotation measures of low-latitude extragalactic sources and the magnetoionic structure of the Galaxy (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Faraday rotation measurements of 56 extragalactic sources obtained predominantly in the range 45-93 deg, /b/ less than 5 deg are reported. Within the longitude range sampled in the present study, RM(l) = 1600 sin (l0 - l) rad/sq m, with a null in RM occurring at 62 deg. Under the assumption of a uniform circular geometry for the magnetic field lines, it is argued that the magnetoionic medium must exist to a Galactocentric radius of about 25 kpc to produce the observed magnitudes of the RMs, where it is assumed that ne and /B/ equal their local values of 0.03/cu cm and 2.1 micro-G out to Rm. The medium must exist to an even greater radius if ne and/or /B/ decrease with R, as is likely. Comparison of extragalactic and pulsar RMs along nearly coincident lines of sight is consistent with at least one field reversal exterior to the radius of the solar orbit about the Galactic center.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 386; 143-157
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    HST imaging of hydrogen-poor ejecta in Abell 30 and Abell 78 - Wind-blown cometary structures (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: HST Faint Object Camera images of hydrogen-poor gas in the planetary nebulae A30 and A78 have revealed remarkable 'cometary' structures in the O III 5007-A forbidden line. Most of these cometary structures, consisting of compact (0.15-0.5 arcsec) knots with radial tails several arcsec in length, are located in an equatorial plane in both nebulae. In addition, two bright, compact (0.3 arcsec) polar knots are present in A30, one of them forming a bow shock. Corresponding polar features in A78 are more diffuse. The central stars of both nebulae have energetic winds which are most likely responsible for the 'cometary' knot morphology. We interpret this morphology in terms of dense (several thousand electrons per cu cm) H-poor condensations whose outer expanding layers are swept outward by stellar winds. Photoionization modeling indicates that while dense knot cores are mostly heated by atomic photoionization, expanding tenuous gas is heated by photoelectrons ejected from abundant dust grains. Our models predict steep temperature gradients for which there is observational evidence and possible abrupt phase transitions in the expanding gas.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 415; 1; p. L47-L50.
    Format: text
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    NASA TECHNICAL REPORTS
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