Dwarf Satellite Galaxies in the Modified Dynamics | Zendy

Rafael Brada | Zendy; Mordehai Milgrom | Zendy

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Dwarf Satellite Galaxies in the Modified Dynamics

Author(s) -

Rafael Brada,

Mordehai Milgrom

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309475

Subject(s) - physics , milky way , dwarf galaxy , astrophysics , satellite galaxy , modified newtonian dynamics , astronomy , galaxy , dwarf spheroidal galaxy , local group , orbit (dynamics) , dwarf galaxy problem , velocity dispersion , galaxy rotation curve , halo , interacting galaxy , engineering , aerospace engineering

In the modified dynamics (MOND) the inner workings of dwarf satellites can begreatly affected by their mother galaxy-over and beyond its tidal effects.Because of MOND's nonlinearity a system's internal dynamics can be altered byan external field in which it is immersed (even when this field, by itself, isconstant in space). As a result, the size and velocity dispersion of thesatellite vary as the external field varies along its orbit. A notable outcomeof this is a substantial increase in the dwarf's vulnerability to eventualtidal disruption-rather higher than Newtonian dynamics (with a dark-matterhalo) would lead us to expect for a satellite with given observed parameters.Comment: 15 pages with 5 embedded figures; Astrophysical J in press Corrected error in names of author

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