MOND implications for spectral line profiles of shell galaxies: shell formation history and mass-velocity scaling relations

0445128 - ASÚ 2016 RIV FR eng J - Journal Article
Bílek, Michal - Jungwiert, Bruno - Ebrová, Ivana - Bartošková, Kateřina
MOND implications for spectral line profiles of shell galaxies: shell formation history and mass-velocity scaling relations.
Astronomy & Astrophysics. Roč. 575, March (2015), A29/1-A29/8. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : galaxies * gravitation * kinematics and dynamic
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.185, year: 2015

We study how the circular and expansion velocities behave in MOND for large shells. Circular velocity settles asymptotically at a value determined by the baryonic mass of the galaxy forming the baryonic Tully-Fisher relation known for disk galaxies. Shell expansion velocity also becomes asymptotically constant. The expansion velocities of large shells form a multibranched analogy to the baryonic Tully-Fisher relation, together with the galactic baryonic masses. For many - but not all - shell galaxies, the asymptotic values of these two types of velocities are reached under the effective radius. If MOND is assumed to work in ellipticals, then the shell spectra allow many details of the history to be revealed about the formation of the shell system, including its age. The results pertaining to circular velocities apply to all elliptical galaxies, not only those with shells.
Permanent Link: http://hdl.handle.net/11104/0247542