Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..393a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, July 15, 1986, p. 393-407. SERC-supported research
Astronomy and Astrophysics
Astronomy
16
Counter Rotation, Hydrogen, Interstellar Gas, Rotating Matter, Spiral Galaxies, Astronomical Maps, Galactic Structure, Gravitational Effects, Neutral Gases, Ring Structures
Scientific paper
Single-dish H I observations are presented which show that the outer emission of M51 (NGC 5194/5) is distributed asymmetrically relative to NGC 5194 and has a total extent of 140 kpc, 3.5 times the Holmberg optical dimensions of the system. The outer neutral hydrogen may be distributed in a clumpy broken ring, which appears to rotate in the opposite direction to the central disc of the system. This apparent counter-rotating ring can be explained by a warp in this nearly face-on system. Numerical simulations demonstrate that the peculiar kinematics of the system may be explained if NGC 5194 originally possessed an H I disc having a diameter of 100 kpc, which was subsequently disrupted by the passage of the companion NGC 5195 through the disc. The model shows that the interaction between the two galaxies initially generates a warped outer spiral arm. This arm later expands to form an extensive ring of scattered material which is inclined by 30° to 40° to the inner disc of NGC 5194.
Appleton Phil N.
Davies Rhodri D.
Foster P. A.
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