期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 66, 期 4, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psu059
关键词
galaxies: individual (M 51); galaxies: general; galaxies: kinematics and dynamics; galaxies: structure
We revisit the anomaly of rotation curve in the nearly face-on galaxy M51 that shows an apparently faster decrease of rotation velocity than the Keplerian law in the outer disk, further showing apparent counter rotation in the outermost H I disk. We interpreted this anomaly as being due to warping of the galactic disk, and determined the warping structure of M51's disk using the tilted-ring method, while assuming that the intrinsic rotation curve is normal. It has been shown that the disk is nearly flat in the inner disk at a constant inclination angle, but the disk suddenly bends at radius 7.5 kpc by about 27 degrees. The inclination angle, then, decreases monotonically outward, reaching a perfect face-on ring at 18 kpc, beyond which the disk is warped in the opposite sense to the inner disk, resulting in apparent counter rotation.
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