Accretion of Satellite Galaxies and the Density of the Universe

Details Accretion of Satellite Galaxies and the Density of the Universe Accretion of Satellite Galaxies and the Density of the Universe

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267l...1n&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 267, NO. 1/MAR1, P. L1, 1994

Astronomy and Astrophysics

Astronomy

39

Scientific paper

Recent work suggests that the disc mass of a galaxy like our own cannot have grown by more than 10 per cent through the accretion of satellites over the last 5 Gyr; greater accretion would have led to excessive thickening of the stellar disc. This limit has been interpreted as requiring a low-density universe, since current merger rates are then relatively small. We show that, while almost all galaxy haloes in an {OMEGA} = 1 universe have indeed increased their mass by more than 10 per cent over the last 5 Gyr, many of the associated satellites have not yet merged with the central galaxy. For a standard CDM cosmogony, our simulations suggest that fewer than 30 per cent of spiral discs have grown by over 10 per cent during the last 5 Gyr. Thus the observed thinness of spiral discs may not exclude a high-density universe.

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