H I synthesis observations of the blue compact dwarf NGC 1705
Abstract
Australia Telescope Compact Array H I-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 scalelengths. 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 parametrizations allow for good reproductions of the observations. The models suggest NGC 1705 to have a dark matter halo that is much denser and more compact than previously thought.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- March 2013
- DOI:
- 10.1093/mnras/sts526
- arXiv:
- arXiv:1301.2889
- Bibcode:
- 2013MNRAS.429.2550E
- Keywords:
-
- galaxies: dwarf;
- galaxies: haloes;
- galaxies: kinematics and dynamics;
- Astrophysics - Cosmology and Extragalactic Astrophysics
- E-Print:
- Published in MNRAS. 13 pages, 14 figures