HI synthesis observations of the blue compact dwarf NGC 1705

Abstract

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.

Published in MNRAS. 13 pages, 14 figures

References in corpus (3)

• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• High-resolution dark matter density profiles of THINGS dwarf galaxies: Correcting for non-circular motions
• Observed Properties of Dark Matter: dynamical studies of dSph galaxies

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