Emma M. Kirby, Baerbel Koribalski, Helmut Jerjen, Angel Lopez-Sanchez
We present a detailed analysis of the neutral hydrogen kinematics of 12
nearby dwarf irregular galaxies observed as part of the Local Volume HI Survey
(LVHIS) conducted at the Australia Telescope Compact Array. For each galaxy we
measure the disk parameters (inclination, position angle) and the HI rotation
curve. Six galaxies in our sample (AM0605-341, Argo Dwarf, ESO059-G001,
ESO137-G018, ESO174-G?001, ESO308-G022) have their atomic hydrogen distribution
studied for the first time. AM0605-341 was found to have an extension of
redshifted HI which we propose is due to a tidal interaction with NGC2188.
There is evidence that ESO215-G?009 has extraplanar HI gas. We also compare the
global galaxy properties, in particular the integrated HI flux density and
velocity widths of the observed HI spectra with the results from the low
angular resolution HI Parkes All Sky Survey (HIPASS). We discuss under what
circumstances the 21cm emission line profile can accurately predict the
galaxy's rotation velocity, an observational parameter crucial to study the
classical and baryonic Tully-Fisher relations.
View original:
http://arxiv.org/abs/1202.0354
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