Asymmetry in high-precision global H I profiles of isolated spiral galaxies

Details Asymmetry in high-precision global H I profiles of isolated spiral galaxies Asymmetry in high-precision global H I profiles of isolated spiral galaxies

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115...62h&link_type=abstract

Astronomical Journal, vol. 115, p. 62

Astronomy and Astrophysics

Astronomy

119

Asymmetry, Spiral Galaxies, Galactic Structure, Flux Density, Calibrating

Scientific paper

New high-SNR 21 cm H I line profiles have been obtained for 104 galaxies with the Green Bank 43 m telescope. The primary sample is composed of isolated spirals with no known optical companions within a 1 radius and a median ratio of optical diameter to beamwidth of 0.17. An effort was made to ensure linearity of baseline fitting and precise flux density calibration to better than 5 percent. Two quantitative measures of asymmetry are applied to assess the occurrence of lopsidedness in the global H I profiles. In agreement with previous estimates, half the galaxies show significant H I profile asymmetries. The lopsidedness cannot be explained by pointing offsets but, rather, must result from noncircular motions, confusion with unidentified companions within the telescope beam, or true distortions in the H I distribution.

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