Discovery of Neutral Hydrogen Associated with the Shells of Elliptical Galaxies

Schiminovich, D., van Gorkom, J. & van der Hulst, J. M., 1-Dec-1993, In : Bulletin of the American Astronomical Society. 25, p. 1354

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We present VLA images and kinematics of neutral hydrogen associated with the shells of two elliptical galaxies, NGC 5128 (Centaurus A) and NGC 2865. We note in particular several striking features which the two galaxies have in common. In both galaxies, the HI distribution follows the curvature of the outermost `diffuse' shells, and is slightly offset, shifted to the outside of the shells. Furthermore, the HI shows a smooth gradient in velocity over ~ 400 km/s with a sense of rotation similar to that of the main body of the optical galaxy. The similar properties of the gas near the shells challenge existing theories of shell formation.
Original languageEnglish
Pages (from-to)1354
JournalBulletin of the American Astronomical Society
Publication statusPublished - 1-Dec-1993

ID: 25236377