Dynamics of Groups around Interacting Double Ellipticals: Measuring Dark Matter Haloes

Content Provider	Scilit
Author	Quintana, H.
Copyright Year	1990
Description	Binary galaxies, as binary stars, are important to measure masses, as suggested by Page (1952). Because three orbit parameters are measurable for galaxies at one instant of time, severe uncertainties remain in the orbit and mass determinations. These uncertainties can partly be overcome by statistical studies of selected samples and/or n-body simulations. Close double galaxies (and isolated galaxies) could also be useful to estimate dynamical masses if we can find test particles around them.Interacting elliptical pairs or dumb-bell galaxies are found with a large range, between 0-1200 km $s^{-1}$, of relative radial velocities. Standard 2-body orbit calculations, highly uncertain due to projection factors, suggest for the largest velocity differences very large galaxy masses, if the systems are bound and stationary. However, recent n-body simulations model these binaries as galaxies captured from hyperbolic orbits, requiring masses of order a few times $10^{11}$M⊙) (Borne et al. 1988), but producing systems that are short lived.
Related Links	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/529C3EAE0879EAB064378BF4F3B5EADB/S025292110000484Xa.pdf/div-class-title-dynamics-of-groups-around-interacting-double-ellipticals-measuring-dark-matter-haloes-div.pdf
Ending Page	41
Page Count	5
Starting Page	37
ISSN	02529211
DOI	10.1017/s025292110000484x
Journal	International Astronomical Union Colloquium
Volume Number	124
Language	English
Publisher	Cambridge University Press (CUP)
Publisher Date	1990-01-01
Access Restriction	Open
Subject Keyword	International Astronomical Union Colloquium Astronomy and Astrophysics Binaries As Galaxies
Content Type	Text
Resource Type	Article