Bulletin of Taras Shevchenko National University of Kyiv. Astronomy, no. 57, p. 6-10 (2018)

Determination of the double galaxies masses by the “timing argument” method

 Kudrya Yu., Ph. D.
Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv

Abstract

The possibilities of application of the “timing argument” (ТА) method to the physical pairs of galaxies that differ from the pair M31 – Milky Way are considered. We confine ourselves to pairs in the Local volume, imposing the additional isolation conditions on candidates for inclusion in the sample. The method was supplemented by the manner of taking into account the nonparallel- ism of the radial velocities of galaxies of close (wide) pairs. For the fourteen physical galaxy pairs (see a list in Tables) of the Local volume galaxies their ТА masses, including masses of dark matter, were estimated. The ratio χ of the mass of pairs to the sum of stellar masses was obtained in wide range from 0.5 to 4000. In some cases (KPG-40, KM-94, J0742+16, J1303-17, J1315+47) the masses estimated by TA are in agreement with popular estimates of χ. For whole sample, taking into account such variance of χ values it is difficult to make certain conclusions regarding its physical causes. Most likely, the TA model in the majority of the cases considered can not be used, pairs of general considerations can have a relative rotational moment.

Key words
Galaxies, pairs of galaxies, masses of galaxies, dark matter

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DOI: https://doi.org/10.17721/BTSNUA.2018.57.6-10