Testing MOND gravity in the shell galaxy NGC 3923

0422929 - ASÚ 2014 RIV FR eng J - Journal Article
Bílek, Michal - Jungwiert, Bruno - Jílková, L. - Ebrová, Ivana - Bartošková, Kateřina - Křížek, Miroslav
Testing MOND gravity in the shell galaxy NGC 3923.
Astronomy & Astrophysics. Roč. 559, November (2013), A110/1-A110/8. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : gravitation * elliptical and lenticular galaxies
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 4.479, year: 2013

We test whether the observed shell distribution in NGC 3923 is consistent with MOND using the current observational knowledge of the shell number and positions and of the host galaxy surface brightness profile, which supersede the data available in the 1980s when the last (and negative) tests of MOND viability were performed on NGC 3923. Our model reproduces the observed shell radii with a maximum deviation of ~5% for 25 out of 27 known shells while keeping a reasonable formation scenario. A multi-generation nature of the shell system, resulting from successive passages of the surviving core of the tidally disrupted dwarf galaxy, is one of key ingredients of our scenario supported by the extreme shell radial range. The 25 reproduced shells are interpreted as belonging to three generations.
Permanent Link: http://hdl.handle.net/11104/0229168