A High-resolution Mosaic of the Neutral Hydrogen in the M81 Triplet

This dataset shows the distribution of neutral hydrogen in and around the M81 galaxy triplet (M81, M82, NGC 3077) and consists of a 3° × 3°, 105-pointing, high-resolution neutral hydrogen (H I) mosaic obtained with the Very Large Array C and D arrays. The data are described in the paper by de Blok et al. (2018).

Here we provide the following data products:

Cubes:

• the natural-weighted cube of the VLA C+D mosaic: m81.nat.cube.fits
• the robust-weighted cube of the VLA C+D mosaic: m81.rob.cube.fits
• the natural-weighted cube using only D-array-like baselines: m81_D.nat.cube.fits
• the natural-weighted and zero-spacing corrected data cube of the VLA C+D array and GBT single-dish data from Chynoweth et al. (2011): m81.zero.cube.fits

Moment maps:

• natural-weighted zeroth (column density), first (velocity field) and second (velocity dispersion) moment maps of the VLA C+D mosaic: m81.nat.mom[0,1,2].fits
• robust-weighted zeroth (column density), first (velocity field) and second (velocity dispersion) moment maps of the VLA C+D mosaic: m81.rob.mom[0,1,2].fits
• natural-weighted zeroth, first and second moment maps of the "D-array" mosaic: m81_D.nat.mom[0,1,2].fits
• zero-spacing corrected natural-weighted integrated HI map (zeroth-moment) of VLA C+D and GBT data: m81.zero.mom0.fits

Acknowledgements:

If you make use of these data please cite the original paper:

de Blok et al. (2018) - de Blok, W.J.G., Walter, F., Ferguson, A.M.N., et al. 2018, ApJ, 865, 26 (10.3847/1538-4357/aad557)