1301.2889 (E. C. Elson et al.)

HI synthesis observations of the blue compact dwarf NGC 1705    [PDF]

E. C. Elson, W. J. G. de Blok, R. C. Kraan-Korteweg

Australia Telescope Compact Array HI-line observations of the nearby dwarf galaxy NGC 1705 are presented. The data are used to trace the gravitational potential of the galaxy out to several stellar disc scale lengths. A rotation curve is derived for the system and used to generate mass models. Dark matter dominates the gravitational potential at nearly all galactocentric radii. NFW and pseudo-isothermal sphere halo parameterisations allowing for good reproductions of the observations. The models suggest NGC 1705 to have a dark matter halo that it much denser and more compact than previously thought.

View original: http://arxiv.org/abs/1301.2889