Neutral hydrogen observations of the interacting galaxies NGC 4725 and NGC 4747

Details Neutral hydrogen observations of the interacting galaxies NGC 4725 and NGC 4747 Neutral hydrogen observations of the interacting galaxies NGC 4725 and NGC 4747

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..125w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 125-140. Research supported by the Science and Engin

Astronomy and Astrophysics

Astrophysics

26

Galaxies, Hydrogen Clouds, Interacting Galaxies, Interstellar Matter, Astronomical Maps, Emission Spectra, Interactions, Peculiar Galaxies, Photographic Plates, Spiral Galaxies

Scientific paper

New high sensitivity single dish and aperture synthesis H I observations are presented of the galaxies NGC 4725 and NGC 4747. The kinematics and distribution of H I in the two galaxies strongly suggest that they are tidally interacting. A 45 - 50 kpc long H I plume extends from the centre of the small peculiar galaxy NGC 4747 but is offset in position angle by 11° from an associated optical plume. To the south of the galaxy a weaker clumpy H I plume is observed which points back towards NGC 4725. This plume has a small velocity gradient along its length which is in the opposite sense to that of the main rotation of the galaxy. The giant spiral galaxy NGC 4725 is dominated in H I by a main outer arm. Evidence is presented which shows that the arm is probably warped out of the plane of the galaxy. A number of other inner spiral arms and an inner H I ring are discussed.

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