Measurement of spin temperatures in a rapidly moving H I shell

Details Measurement of spin temperatures in a rapidly moving H I shell Measurement of spin temperatures in a rapidly moving H I shell

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..716k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 15, 1985, p. 716-721. Research supported by the University of Mi

Astronomy and Astrophysics

Astrophysics

17

Extragalactic Radio Sources, Hydrogen Clouds, Interstellar Magnetic Fields, Radial Velocity, Spin Temperature, Zeeman Effect, Absorption Spectra, Astronomical Models, Centimeter Waves, Emission Spectra, Very Long Base Interferometry

Scientific paper

High-quality H I absorption spectra toward 3C 123 and 3C 147 are presented. For the normal-velocity H I two upper limits to magnetic field strengths and an upper limit to the spin temperature of the intercloud medium are reported. Anomalous-velocity H I is present along both lines of sight. It is found that this H I arises in a rapidly moving large-angular-diameter H I structure. Emission and absorption properties of this H I are also anomalous. Evidence suggesting that the H I structure is the result of collision of high-velocity clouds with the H I disk is presented, suggesting that the H I structure is postshock gas that is cooling down.

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