VizieR Online Data Catalog: Rotational velocities of M33 (Kam+, 2017)
Abstract
The primary observations for this study were made with the Synthesis Telescope (ST) at the Dominion Radio Astrophysical Observatory (DRAO). This telescope is an east-west interferometer consisting of seven dishes (~9m diameter) spaced variously across a baseline range of 13-617m. At 1420MHz, the longest baseline achieves a synthesized half-power beam width of 49''(EW) by 49''/sinδ(NS) with uniform weighting, although in the HI line we use a Gaussian taper in the u,v plane to increase the sensitivity of each velocity channel at the slight expense of resolution (58"*58"/sinδ).
Observations of M33 consist of Stokes I, Q, U, and V made in a 30MHz continuum band centered at 1420MHz (λ21cm), Stokes I in a 2MHz band at 408MHz (λ74cm), and 256 channels within a 2MHz band centered on the HI line. For this study we use only the HI data products; future studies will present the total power and polarized radio emission from M33. The datacube velocity resolution is 2.64km/s at 21cm, and each channel is ΔV=1.65km/s wide. The band was centered on a heliocentric velocity of VHEL=-180km/s. The measured noise per channel is ~12-13mJy/beam or ΔTB~1.1K in the elliptical synthesized beam (58"*114"). To increase sensitivity to the faint outermost HI disk of M33, a total of six full-synthesis pointings on and around the galaxy were observed and mosaiced together (on 09/29/08, 11/05/08, and 12/04/08). To recover the large-scale HI structures in M33, we merge single-dish (also known as "short-spacing") data obtained from the Turn-On GALFA Survey (TOGS) portion of the GALFA-HI survey at Arecibo. These data were previously published by Putman et al. (2009ApJ...703.1486P). Please refer to Section 2 in the paper for additional details about the 21cm observations. (1 data file).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- October 2017
- DOI:
- 10.26093/cds/vizier.51540041
- Bibcode:
- 2017yCat..51540041K
- Keywords:
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- Galaxies: nearby;
- Galaxies: rotation;
- Rotational velocities;
- H I data