ZELDOVICH LOCAL PANCAKE: DARK ENERGY DOMINATION

Odessa Astronomical Publications

卷:31

I. D. Karachentsev¹  A. D. Chernin²  N. V. Emelyanov² 

[1] Special Astrophysical Observatory, Russian Academy of Sciences, Nizhniy Arkhys;

[2] Sternberg Astronomical Institute, Moscow University;

关键词: galaxies;    groups;    kinematics and dynamics;    dark energy;   

DOI  :  10.18524/1810-4215.2018.31.144435

来源: DOAJ

【 摘 要 】

Zeldovich Local Pancake is a two-dimensionalsystem of 15 giant galaxies nearest to us. Two of thegalaxies, the Milky Way and the Andromeda Galaxy,move to each other in the Local Group, while the restof the galaxies are located around the group at thedistances up to 10 Mpc from the group barycenterand move away from it forming a local expansionoutflow. We use recent Hubble Space Telescope dataon local giants and their numerous fainter companionsto study the dynamical structure and evolutionarytrends of the expanding system. N-body computermodel, which reproduces the observed kinematics ofthe flow, is constructed under the assumption thatthe system as a whole is embedded in the universaldark energy background. In the model, the motionsof the flow bodies are controlled by their mutualattraction force and the repulsion force producedby the dark energy. It is found that the repulsiondominates the force field of the system. Becauseof this, the the system expands with acceleration.The dark energy domination increases with time andintroduces to the expansion flow an asymptoticallylinear velocity-distance relation with the universaltime-rate (the Hubble constant) that depends on thedark energy density only.

【 授权许可】

Unknown