Publikationsdatum:
2013-05-26
Beschreibung:
We present new 21-cm neutral hydrogen (H i ) observations of spiral galaxies for the 2MASS Tully–Fisher (2MTF) survey. Using the 64-m Parkes radio telescope multibeam system we obtain 152 high signal-to-noise ratio H i spectra from which we extract 148 high-accuracy (〈5 per cent error) velocity widths and derive reliable rotation velocities. The observed sample consists of 303 southern ( 〈 –40°) galaxies selected from the 2MASS Redshift Survey with K s 〈 11.25 mag, cz 〈 10 000 km s –1 and axis ratio b / a 〈 0.5. The H i observations reported in this paper will be combined with new H i spectra from the Green Bank and Arecibo telescopes, together producing the most uniform Tully–Fisher survey ever constructed (in terms of sky coverage). In particular, due to its near-infrared selection, 2MTF will be significantly more complete at low Galactic latitude (| b | 〈 15°) and will provide a more reliable map of peculiar velocities in the local Universe.
Print ISSN:
0035-8711
Digitale ISSN:
1365-2966
Thema:
Physik
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