On the warped optical plane of M33

Details On the warped optical plane of M33 On the warped optical plane of M33

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236l...1s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 236, Feb. 15, 1980, p. L1-L5.

Astronomy and Astrophysics

Astrophysics

49

Cosmology, Galactic Structure, Spiral Galaxies, Astrophysics, Brightness, Hydrogen Clouds, Optical Properties

Scientific paper

The shapes of the spiral arms of M33 betray a severely warped plane over most of the optical image. Ten spiral arms are identified, five on each side of the center. The inclination of the arms and of the optical disk to the plane of the sky increases outward from an angle of 40 deg near the center to about 67 deg at r of about 30 arcmin, while the position angle of the major axis rotates from about 50 deg toward P.A. of about 0 deg. The optical warp begins within 0.25 of the Holmberg radius. The consequences of the smaller omega value are (1) the M33 rotation curve is steeper for r less than 10 arc min than current models, and (2) the calibration of the Tully-Fisher 21 cm line width-absolute magnitude relation may be affected.

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