The thermal effects of H2 molecules in rotating and collapsing spheroidal gas clouds

Details The thermal effects of H2 molecules in rotating and collapsing spheroidal gas clouds The thermal effects of H2 molecules in rotating and collapsing spheroidal gas clouds

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205..103h&link_type=abstract

Astrophysical Journal, vol. 205, Apr. 1, 1976, pt. 1, p. 103-121.

Astronomy and Astrophysics

Astrophysics

103

Hydrogen Clouds, Molecular Gases, Rotating Matter, Stellar Evolution, Temperature Effects, Astronomical Models, Gravitational Collapse, Heat Transfer, Oblate Spheroids, Perturbation Theory, Prolate Spheroids, Stellar Mass

Scientific paper

The thermal evolution of a protogalactic density perturbation within the expanding background of various Friedmann universes is studied for the case of a uniform pressure-free spheroid which reaches its maximum extension at some time, undergoes homologous collapse, and rotates as a solid body for times later than the time of maximum extension. Cooling of the cloud by radiation in the rotational lines of H2 molecules formed through various reactions is investigated in order to determine the Jeans mass. Dynamic processes during the precollapse epoch are analyzed, and a theory of heat exchange with the radiation field through rotational transitions of H2 molecules in their electronic and vibrational ground states is developed. Conditions on the matter temperature and electron concentration at the time of maximum extension are presented as explicit functions of the background model parameter and the time of maximum extension. The chemical reaction equations and rates of importance during collapse are discussed, and the collapse dynamics is considered. The thermal effects of H2 molecules are examined as functions of the background model, the time of maximum extension, the initial axial ratio, and rotation for initially spherical, oblate, and prolate clouds.

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