H I observations of IC 10 with the DRAO synthesis telescope
Abstract
H I observations of the nearby blue compact dwarf galaxy IC 10 obtained with the Dominion Radio Astrophysical Observatory synthesis telescope, for a total integration of ∼1000 h, are presented. We confirm the NW faint 21 cm H I emission feature discovered in Green Bank Telescope (GBT) observations. The H I feature has an H I mass of 4.7 × 105 M⊙, which is only ∼0.6 {{ per cent}} of the total H I mass of the galaxy (7.8 × 107 M⊙). In the inner disc, the rotation curve of IC 10 rises steeply, then flattens until the last point where it rises again, with a maximum velocity of 30 km s-1. Based on our mass models, the kinematics of the inner disc of IC 10 can be described without the need of a dark matter halo. However, this does not exclude the possible presence of dark matter on a larger scale. It is unlikely that the disturbed features seen in the outer H I disc of IC 10 are caused by an interaction with M 31. Features seen from our simulations are larger and at lower surface density than can be reached by current observations. The higher velocity dispersions seen in regions where several distinct H I features meet with the main core of IC 10 suggest that there is ongoing accretion.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- December 2019
- DOI:
- 10.1093/mnras/stz2737
- arXiv:
- arXiv:1908.02198
- Bibcode:
- 2019MNRAS.490.3365N
- Keywords:
-
- techniques: interferometric;
- ISM: kinematics and dynamics;
- galaxies: dwarf;
- galaxies: individual: IC 10;
- Local Group;
- dark matter;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 15 pages, 14 figures. Accepted in MNRAS