Estimation of the distances to high velocity clouds

Details Estimation of the distances to high velocity clouds Estimation of the distances to high velocity clouds

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..145h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 1, April 1990, p. 145-152. Research supported by ZWO.

Astronomy and Astrophysics

Astronomy

7

Astrometry, Hydrogen Clouds, Magellanic Clouds, Molecular Clouds, Infrared Spectra, Sky Surveys (Astronomy), Velocity Distribution

Scientific paper

It is shown that reasonable estimates of the distances to high-velocity hydrogen clouds (HVC) can be obtained from the assumption regarding the correlation between 21-cm emission line widths and cloud size (similar to that observed in the case of many different sets of gas and stellar data). The effects of different cloud identifications and other sources of uncertainties in the estimates are discussed. It is suggested that the internal consistency of the results may be within a factor of 3. The proposed method may be useful in deciding whether HVCs are a phenomenon inside the Galaxy or whether they are located in the outer halo of the Milky Way.

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