A Difference in Dark Halos of Spiral and Elliptical Galaxies

Details A Difference in Dark Halos of Spiral and Elliptical Galaxies A Difference in Dark Halos of Spiral and Elliptical Galaxies

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988afz....28..279s&link_type=abstract

Astrofizika, Vol.28:2, P. 279, 1988

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The data on rotation curves and hot coronae of giant galaxies show that the value of Mv/R for elliptical galaxies is by an order of magnitude higher than that for spiral galaxies with the same stellar mass, Ms ≡ 1011M_sun; (Mv is the mass of a dark halo within a sphere of a radius R). The small value of Mv/R of spiral galaxies may prevent them from having hot coronae. Normal E-galaxies and cD-galaxy M87 appear to have the same value of Mv/R. Perhaps this indicates that coronae of cD and giant E-galaxies have also the same mass and radius. This leads to a suggestion that a cD-galaxy originally does not differ from a normal E-galaxy and only its central position within a cluster enables it to turn into a cD-system due, for example, to accretion of the cluster gas.

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