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Dark matter or modified dynamics?: hints from galaxy kinematics

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Abstract
I show two observational projects I am involved in, which are aimed at understanding better the existence and nature of dark matter, and also aimed at testing alternatives to galactic dark matter such as MOND (Modified Newtonian Dynamics). I present new HI observations of the nearby dwarf galaxy NGC 3741. This galaxy has an extremely extended HI disc (42 B-band exponential scalelengths). The distribution and kinematics are accurately derived by building model data cubes, which closely reproduce the observations. Mass modelling of the rotation curve shows that a cored dark matter halo or MOND provide very good fits, whereas Cold Dark Matter density profiles fail to fit the data. I also show new results about tidal dwarf galaxies, which within the CDM framework are expected to be dark matter-free but whose kinematics instead show a mass discrepancy, exactly of the magnitude that is expected in MOND (Modified Newtonian Dynamics).
Keywords
Galaxy kinematics, Spiral galaxies, dark matter, MODIFIED NEWTONIAN DYNAMICS, SURFACE BRIGHTNESS GALAXIES, RESOLUTION ROTATION CURVES, SPIRAL GALAXIES, DWARF GALAXIES, MASS, HALOS, EVOLUTION, PROFILES

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Chicago
Gentile, Gianfranco. 2010. “Dark Matter or Modified Dynamics?: Hints from Galaxy Kinematics.” In Dark Matter in Astrophysics and Particle Physics (DARK 2009), ed. HV Klapdor Kleingrothaus and IV Krivosheina, 440–448. Singapore, Singapore: World Scientific.
APA
Gentile, G. (2010). Dark matter or modified dynamics?: hints from galaxy kinematics. In H. Klapdor Kleingrothaus & I. Krivosheina (Eds.), Dark matter in astrophysics and particle physics (DARK 2009) (pp. 440–448). Presented at the 7th International Heidelberg conference on Dark Matter in Astrophysics and Particle Physics (DARK 2009), Singapore, Singapore: World Scientific.
Vancouver
1.
Gentile G. Dark matter or modified dynamics?: hints from galaxy kinematics. In: Klapdor Kleingrothaus H, Krivosheina I, editors. Dark matter in astrophysics and particle physics (DARK 2009). Singapore, Singapore: World Scientific; 2010. p. 440–8.
MLA
Gentile, Gianfranco. “Dark Matter or Modified Dynamics?: Hints from Galaxy Kinematics.” Dark Matter in Astrophysics and Particle Physics (DARK 2009). Ed. HV Klapdor Kleingrothaus & IV Krivosheina. Singapore, Singapore: World Scientific, 2010. 440–448. Print.
@inproceedings{1253533,
  abstract     = {I show two observational projects I am involved in, which are aimed at understanding better the existence and nature of dark matter, and also aimed at testing alternatives to galactic dark matter such as MOND (Modified Newtonian Dynamics). I present new HI observations of the nearby dwarf galaxy NGC 3741. This galaxy has an extremely extended HI disc (42 B-band exponential scalelengths). The distribution and kinematics are accurately derived by building model data cubes, which closely reproduce the observations. Mass modelling of the rotation curve shows that a cored dark matter halo or MOND provide very good fits, whereas Cold Dark Matter density profiles fail to fit the data. I also show new results about tidal dwarf galaxies, which within the CDM framework are expected to be dark matter-free but whose kinematics instead show a mass discrepancy, exactly of the magnitude that is expected in MOND (Modified Newtonian Dynamics).},
  author       = {Gentile, Gianfranco},
  booktitle    = {Dark matter in astrophysics and particle physics (DARK 2009)},
  editor       = {Klapdor Kleingrothaus, HV and Krivosheina, IV},
  isbn         = {9789814293785},
  keyword      = {Galaxy kinematics,Spiral galaxies,dark matter,MODIFIED NEWTONIAN DYNAMICS,SURFACE BRIGHTNESS GALAXIES,RESOLUTION ROTATION CURVES,SPIRAL GALAXIES,DWARF GALAXIES,MASS,HALOS,EVOLUTION,PROFILES},
  language     = {eng},
  location     = {Christchurch, New Zealand},
  pages        = {440--448},
  publisher    = {World Scientific},
  title        = {Dark matter or modified dynamics?: hints from galaxy kinematics},
  url          = {http://dx.doi.org/10.1142/9789814293792\_0035},
  year         = {2010},
}

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