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Milky Way Rotation Models from Neutral Hydrogen and Molecular Clouds: Galactic Constants, Common Details and Differences

Published online by Cambridge University Press:  12 April 2016

Igor’ I. Nikiforov
Igor’ I. Nikiforov*
Affiliation:
Sobolev Astronomical Institute, St. Petersburg University, Bibliotechnaya pl. 2, 198904 St. Petersburg, Russia

Extract

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Kinematic data from neutral hydrogen observations provide information to solve the interdependent problems of the determination of the main Galactic constants (the Solar-Galactic center distance R0, the Oort constant A and others) and the Galactic rotation curve (Nikiforov & Petrovskaya 1994, hereafter NP94, and references therein). However, in the standard method for finding R0 by comparing the rotations of HI clouds and some other objects (typically HII regions/CO clouds), the kinematic model, constructed typically solely from HI data, is considered to be the same for both galactic subsystems (e.g. Merrifield 1992). In practice a discrepancy between their rotation curves can produce strongly erroneous results (Merrifield 1992, NP94). Establishing the common rotation law from HI plus HII/CO data in NP94 is only a part of attacking the problem.

Type
Part 5. Dark Matter and Clustering
Information
International Astronomical Union Colloquium , Volume 174: Small Galaxy Groups , 2000 , pp. 403 - 407
Copyright
Copyright © Astronomical Society of the Pacific 2000

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