Neutral hydrogen in the interacting pair NGC 4725/NGC 4747

Details Neutral hydrogen in the interacting pair NGC 4725/NGC 4747 Neutral hydrogen in the interacting pair NGC 4725/NGC 4747

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1830h&link_type=abstract

Astronomical Journal, vol. 84, Dec. 1979, p. 1830-1836.

Astronomy and Astrophysics

Astrophysics

9

Galactic Structure, Hydrogen Clouds, Interstellar Gas, Neutral Gases, Astronomical Photography, Galactic Evolution, Photographic Plates, Spiral Galaxies, Velocity Distribution

Scientific paper

Neutral hydrogen observations of the galaxy pair NGC 4725/NGC 4747, a subsystem within the Coma I cloud, reveal severe distortion in the HI distribution of NGC 4747. The ridge of the HI emission within the galaxy deviates from the optical major axis by about 30 deg and appears to coincide with a faint optical appendage. The companion NGC 4725, a supergiant spiral, is the most prominent member of the Coma I cloud and is almost twenty times more massive than its neighbor. NGC 4725 itself shows small but noticeable perturbations. A tidal encounter is invoked in order to explain the catastrophic events which have led to the distortion of NGC 4747 and the formation of its HI and optical tail.

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