期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 420, 期 4, 页码 2924-2943出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2011.20103.x
关键词
galaxies: dwarf; galaxies: individual: AM 0605-341; galaxies: individual: Argo dwarf irregular; galaxies: individual: ESO 215-G?009; galaxies: kinematics and dynamics; radio lines: galaxies
资金
- Commonwealth of Australia
- Australian Research Council [DP0451426]
- National Aeronautics and Space Administration
- Australian Research Council [DP0451426] Funding Source: Australian Research Council
We present a detailed analysis of the neutral hydrogen kinematics of 12 nearby dwarf irregular galaxies observed as part of the Local Volume H i Survey conducted at the Australia Telescope Compact Array. For each galaxy we measure the disc parameters (inclination, position angle) and the H i rotation curve. Six galaxies in our sample (AM 0605-341, Argo Dwarf, ESO 059-G001, ESO 137-G018, ESO 174-G?001 and ESO 308-G022) have their atomic hydrogen distribution studied for the first time. AM 0605-341 was found to have an extension of redshifted H i which we propose is due to a tidal interaction with NGC 2188. There is evidence that ESO 215-G?009 has extraplanar H i gas. We also compare the global galaxy properties, in particular the integrated H i flux density and velocity widths of the observed H i spectra, with the results from the low angular resolution H i Parkes All Sky Survey. We discuss under what circumstances the 21 cm emission-line profile can accurately predict the galaxies rotation velocity, an observational parameter crucial to study the classical and baryonic TullyFisher relations.
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