Abstract

SANCHEZ-SALCEDO, F. J.; HIDALGO-GAMEZ, A. M.  and  MARTINEZ-GARCIA, Eric E.. The inclination of the dwarf irregular galaxy Holmberg II. Rev. mex. astron. astrofis [online]. 2014, vol.50, n.2, pp.225-235. ISSN 0185-1101.

We provide constraints on the inclination angle of the H I disk of the dwarf irregular galaxy Holmberg II (Ho II) from a stability analysis of the outer gaseous disk. We point out that a mean inclination angle of 27° and thus a flat circular velocity of ≈60 km s^-1, is required to have a level of gravitational stability similar to that found in other galaxies. Adopting this inclination angle, we find that Ho II lies on the right location in the baryonic Tully-Fisher relation. Moreover, for this inclination, its rotation curve is consistent with MOND. However, the corresponding analysis of the stability under MOND indicates that this galaxy could be problematic for MOND because its outer parts are marginally unstable in this gravity theory. We urge MOND simulators to study numerically the non-linear stability of gas-rich dwarf galaxies since this may provide a new key test for MOND.

Keywords : dark matter; galaxies [individual (Holmberg II)]; galaxies [kinematics and dynamics]; gravitation.