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1987•Symposium - International Astronomical UnionOpen access

The Ring of HI in LEO: Probing the Mass Distribution in a Galaxy Group

Stephen Edward Schneider, E. E. Salpeter, Yervant Terzian

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Abstract

The intergalactic neutral hydrogen in the M96 group (Schneider et al. 1983) provides an unusual probe of the detailed mass distribution in a group of galaxies. Previous observations (Schneider 1985) tentatively suggested the existence of a large ring structure to the gas. Sensitive new observations made at Arecibo confirm that the intergalactic gas forms a 200 kpc diameter eccentric ring around the two central galaxies in the group, the giant elliptical galaxy NGC 3379 (M105) and the lenticular NGC 3384.

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The intergalactic neutral hydrogen in the M96 group (Schneider et al. 1983) provides an unusual probe of the detailed mass distribution in a group of galaxies. Previous observations (Schneider 1985) tentatively suggested the existence of a large ring structure to the gas. Sensitive new observations made at Arecibo confirm that the intergalactic gas forms a 200 kpc diameter eccentric ring around the two central galaxies in the group, the giant elliptical galaxy NGC 3379 (M105) and the lenticular NGC 3384.

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Available abstract

The intergalactic neutral hydrogen in the M96 group (Schneider et al. 1983) provides an unusual probe of the detailed mass distribution in a group of galaxies. Previous observations (Schneider 1985) tentatively suggested the existence of a large ring structure to the gas. Sensitive new observations made at Arecibo confirm that the intergalactic gas forms a 200 kpc diameter eccentric ring around the two central galaxies in the group, the giant elliptical galaxy NGC 3379 (M105) and the lenticular NGC 3384.

Key concepts: Physics, Intergalactic travel, Astrophysics, Galaxy group, Galaxy, Local Group, Astronomy, Elliptical galaxy

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