WHAM-NSS version 1.0

The Wisconsin H-Alpha Mapper Northern Sky Survey is available as two datasets. The first is the full kinematic release containing 37,565 spectra covering the sky above declination -30 degrees and revealing Galactic H-Alpha emission between about -100 to +100 km/s (LSR) with 12 km/s resolution. The second dataset contains only the velocity integrated (-80 to +80 km/s LSR) intensities of these datapoints. As a convenience, the kinematic release contains the integrated data as well.

    Documentation

    The following document contains information about the release and the format of the data. Each data file also includes a README in the header or in an IDL variable. Please read them carefully before contacting us with questions. The current version was edited on 11/28/2001.

  • PS [94 k]
  • PDF [131 k]

Pre-generated Images

The following grid of images contains a variety of velocity-integrated Hammer-Aitoff representations of the WHAM-NSS. Each contains a slightly different logarithmic scaling (as noted in the colorbar for each image) to maximize the structure displayed for the velocity slice. The slices are projected with one of three longitude centers, l = 120, 0, and 180 degrees. For each slice and center, we provide the following graphic formats: PNG, GIF, and Postscript with white background (PSw) or a black background (PSb).

These images complement Figures 6 and 8 from the published WHAM-NSS paper.

Centered at l=120 degrees
Velocity Range
[LSR km/s]
File Format
-80 to +80 ("Total")

PNG GIF PSw PSb
-80 to -60 PNG GIF PSw PSb
-60 to -40 PNG GIF PSw PSb
-40 to -20 PNG GIF PSw PSb
-20 to 0 PNG GIF PSw PSb
0 to +20 PNG GIF PSw PSb
+20 to +40 PNG GIF PSw PSb
+40 to +60 PNG GIF PSw PSb
+60 to +80 PNG GIF PSw PSb

Centered at l=0 degrees
Velocity Range
[LSR km/s]
File Format
-80 to +80 ("Total")

PNG GIF PSw PSb
-80 to -60 PNG GIF PSw PSb
-60 to -40 PNG GIF PSw PSb
-40 to -20 PNG GIF PSw PSb
-20 to 0 PNG GIF PSw PSb
0 to +20 PNG GIF PSw PSb
+20 to +40 PNG GIF PSw PSb
+40 to +60 PNG GIF PSw PSb
+60 to +80 PNG GIF PSw PSb

Centered at l=180 degrees
Velocity Range
[LSR km/s]
File Format
-80 to +80 ("Total")

PNG GIF PSw PSb
-80 to -60 PNG GIF PSw PSb
-60 to -40 PNG GIF PSw PSb
-40 to -20 PNG GIF PSw PSb
-20 to 0 PNG GIF PSw PSb
0 to +20 PNG GIF PSw PSb
+20 to +40 PNG GIF PSw PSb
+40 to +60 PNG GIF PSw PSb
+60 to +80 PNG GIF PSw PSb

Public Release Poster

We have produced a public release poster to provide an overview of the WHAM-NSS results. We've been bringing a handfull of these to each meeting we're attending, but you can download a PDF (best quality) or JPEG version here. The text is a bit small because the original poster was created to be 24" x 36". This file is intended to be printed on Tabloid paper (11" x 17"; landscape), but Adobe Acrobat Reader will scale the figure to fit any page size. The file has only been tested with Acrobat Reader versions 4 through 6.

Other H-Alpha Surveys

Two deep, narrow-band H-Alpha CCD imaging surveys have been in operation the last few years. They nicely complement our velocity resolved, low-resolution (degree) survey by providing higher angular (arcminute) resolution images.