NGC 5291 - A massive, gas-rich and highly peculiar lenticular in the IC 4329 cluster

Details NGC 5291 - A massive, gas-rich and highly peculiar lenticular in the IC 4329 cluster NGC 5291 - A massive, gas-rich and highly peculiar lenticular in the IC 4329 cluster

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.188..285l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 188, July 1979, p. 285-296.

Astronomy and Astrophysics

Astronomy

20

Astronomical Spectroscopy, Elliptical Galaxies, Galactic Clusters, Radio Spectra, Astronomical Models, Astronomical Photography, Brightness, H Ii Regions, Neutral Gases, Radial Velocity, Rotating Disks, Spatial Distribution, Stellar Evolution

Scientific paper

NGC 5291, previously classified as a peculiar elliptical, is the brighter of an interacting pair of galaxies at the western outskirts of the IC 4329 cluster. New deep direct plates show that the pair are flanked by complexes of H II regions which extend 4 arcmin to both north and south. Spectroscopic observations confirm that the H II complexes are definitely associated with NGC 5291 and the whole system extends 200 kpc from north to south. Radio H II observations show that a very large mass (about 100 billion solar masses) of neutral hydrogen is present in the system at a range of radial velocities equal to those observed optically. The preferred explanation of the extraordinary properties of the system involves the compression of an extended gaseous discharge around NGC 5291 by interaction with an intracluster medium. It is suggested that the outlying H II regions, some of which may exceed the whole LMC in size and luminosity, may eventually become detached and form a population of blue dwarf irregular galaxies within the cluster.

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