MOND prediction of a new giant shell in the elliptical galaxy NGC 3923

0434216 - ASÚ 2015 RIV FR eng J - Článek v odborném periodiku
Bílek, Michal - Bartošková, Kateřina - Ebrová, Ivana - Jungwiert, Bruno
MOND prediction of a new giant shell in the elliptical galaxy NGC 3923.
Astronomy & Astrophysics. Roč. 566, June (2014), A151/1-A151/11. ISSN 0004-6361. E-ISSN 1432-0746
Grant ostatní: GA MŠk(CZ) LM2010005; UK(CZ) SVV-26089
Institucionální podpora: RVO:67985815
Klíčová slova: gravitation * galaxies: kinematics and dynamics * galaxies: formation
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 4.378, rok: 2014

We here extend our study by assuming more general models for the gravitational potential to verify the prediction of the new shell and to estimate its position. We tested the consistency of the shell radial distribution observed in NGC 3923 with a wide variety of MOND potentials of the galaxy. The potentials differed in the mass-to-light ratio and in distance to the galaxy. We considered different MOND interpolation functions, values of the acceleration constant a(0), and density profiles of the galaxy. We verified the functionality of our code on a Newtonian self-consistent simulation of the formation of a shell galaxy. Our method reliably predicts that exactly one new outermost shell exists at a galactocentric radius of about 1900 '' (similar to 210 kpc) on the southwestern side of the galaxy. Its estimated surface brightness is about 28 mag arcsec(-2) in B - a value accessible by current instruments. This prediction enables a rare test of MOND in an elliptical down to an acceleration of a(0)/10. The predictive power of our method is verified by reconstructing the position of the largest known shell from the distribution of the remaining shells.
Trvalý link: http://hdl.handle.net/11104/0238328