GALFA-HI DR2

Galactic Arecibo L-Band Feed Array HI survey, Data Release 2. 4′ resolution, 0.184 km s−1 channels, decl. −1°17′ to +37°57′ across all R.A.

Cube Set R.A. centre Dec centre Footprint Size Download

Declination centres are 2.35°, 10.35°, 18.35°, 26.35° and 34.35°. The DR2 paper's link tables print these truncated to +02, +10 and so on; the values here come from the FITS headers.

Build a cube

Any region, any velocity range. Cubes are stitched across tile boundaries and across R.A. = 0 with no resampling.

Or from a script

The same endpoint, no browser required. Anonymous requests are rate-limited; the data are open.

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Python

Each cutout carries HISTORY cards naming the source cubes, the data DOIs and the survey paper.

About these data

GALFA-HI DR2 maps Galactic neutral hydrogen over 13,146 square degrees — 4 steradians, 32% of the sky — at 4′ angular resolution and 0.184 km s−1 channel spacing, with a median noise of 150 mK per 1 km s−1 channel.

Products

Narrow cubes
225 cubes, 0.184 km/s channels over |vLSR| ≤ 188.4 km/s.
Wide cubes
225 cubes, 0.736 km/s channels over |vLSR| ≤ 753.8 km/s.
Column density maps
Far-sidelobe stray-radiation-corrected NHI, with the uncorrected map and the correction itself, over four velocity intervals.

Each cube is 512′ × 512′ on a 1′ Cartesian R.A.–Dec grid, 512 × 512 × 2048 pixels stored as 16-bit integers with BSCALE = 0.008, 1.07 GB per file. Neighbouring cubes overlap by 32′ and agree bit-for-bit in the overlap.

Citation

Peek, J. E. G., Babler, B. L., Zheng, Y., Clark, S. E., Douglas, K. A., Korpela, E. J., Putman, M. E., Stanimirović, S., Gibson, S. J., & Heiles, C. 2018, The GALFA-HI Survey Data Release 2, ApJS, 234, 2.

doi:10.3847/1538-4365/aa91d3

Archival copies

Harvard Dataverse holds the system of record. This site is a service layer over an archival copy.