Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...371..470t&link_type=abstract
Astronomy and Astrophysics, v.371, p.470-475 (2001)
Astronomy and Astrophysics
Astrophysics
7
Galaxies: General, Dark Matter
Scientific paper
Karachentsev's sample of 585 compact binary galaxies is inspected in order to see a signature of extended massive dark haloes around the component galaxies. Our approach utilizes the good velocity-separation resolution provided by this sample containing many close pairs, in order to see directly the expected trends in the M/L vs. Xproj plane. A developed version of Turner's normalization, attempting to take into acount different sizes of binary orbits (increasing with luminosity), makes it possible to see ``directly" a meaningful lower limit of M/L from the emerging short-projection envelope in the M/L vs. Xnorm diagram. This part of the diagram is little influenced by the incompleteness at large values of separation Xproj, which usually l eads to too small values of mass-to-luminosity ratios. We conclude that these binaries give relatively direct evidence for the existence of massive dark haloes, with M/L (conservatively) larger than about 25 (for H0 = 75 km s-1/Mpc), consistent with the simulation studies on Karachentsev's triplets by Chernin & Mikkola (\cite{chernin91}) and on the binaries by Wiren et al. (\cite{wiren96}), and other more recent studies of the triplets (Karachentsev \cite{kara2000}).
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