Low-luminosity companions of early-type galaxies

Details Low-luminosity companions of early-type galaxies Low-luminosity companions of early-type galaxies

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104...57v&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, Jan. 1992, p. 57-61.

Astronomy and Astrophysics

Astronomy

10

Dwarf Galaxies, Galactic Structure, Interacting Galaxies, Luminosity, Red Shift, Galactic Clusters, Star Formation

Scientific paper

Optical redshifts of nine low-luminosity companions of early-type giant galaxies are obtained as part of a study of the small-scale clustering properties of dwarf galaxies. The velocity differences between the low-luminosity companions and the nearest giant are typically less than 300 km/s in the case of 'field' giants and larger for members of groups of galaxies. Early-type companions of isolated giant galaxies may be gravitationally bound satellites which can be used as dynamical probes of dark halos, while in groups of galaxies they are free-floating in the general potential well of the group. The spectra of one nucleated dwarf elliptical and two dwarfs of composite dE and BCD morphology show evidence of recent star formation.

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