Data

Notice: Final Data Release 15 September 2005

In this section, you will be able to download GRS data as FITS cubes. Requests for CLASS file formats should be directed to either Ronak Shah
(ronak@bu.edu) or Jill Rathborne (rathborn@bu.edu).

Please include the following acknowledgement in any published material that makes use of GRS data:

This publication makes use of molecular line data from the Boston University-FCRAO Milky Way Galactic Ring Survey (GRS). The GRS is a joint project of Boston University and Five College Radio Astronomy Observatory, funded by the National Science Foundation under grants AST-9800334, AST-0098562, \& AST-0100793

This page will be updated on a regular basis as the survey coverage grows.

¹³CO Data

The following clickable image map shows an integrated intensity image of the currently available data release for the ¹³CO 1-0 line. The release is divided into l x b = 1 x 2 degree fields centered at integer longitudes and b=0. The data do not yet have the full +/- 1 degree coverage in Galactic latitude. The higher latitudes will be observed in the upcoming observing seasons. The fields have 3 arcmin (8 pixels) overlap on either side.

Download

Click on a part of the image to go to the download section of that longitude and follow the instructions.
The individual files are big (83 MB for the FITS cubes of a 1 x 1.5 degree field).

Details

Each field comprises almost 46,000 spectra on a fully sampled 22" grid. The intensities are on a T_A* antenna temperature scale. To convert this to main beam temperatures, divide by the main beam efficiency of 0.48. The velocity resolution of the data is 0.25 km s^-1 (0.22 km s^-1 sampling). The cubes and spectra cover the velocity range from -10 to 90 km s^-1.

The center position for all files is the Galactic Center, (l,b)=(0,0). The positional grid is based on the 22.14 arcsecond spacing used to sample the sky. Therefore, the centers of each image in pixels will not necessarily fall at whole number or fraction longitude values. If you are processing data of this form for the first time, use double-precision variables.

The coordinates are Galactic latitude and longitude, with a global sinusoidal projection (GLON-GLS, GLAT-GLS).

CS Data

A two square degree pilot field observed in the CS 2-1 line (Galactic Longitude from 44.3 to 46.3 degrees, Galactic Latitude from -0.5 to 0.5 degrees) is available. Click on the image below to go to the download section and follow the instructions.

Details

The field comprises about 62,000 spectra on a fully sampled 22" grid. The spectra are on a T_A* antenna temperature scale. To convert this to main beam temperatures, divide by the main beam efficiency of 0.50. The velocity resolution of the data is 0.26 km s^-1 (0.24 km s^-1 sampling).

The GRS is supported by the NSF via grants AST-9800334 and AST-0098562-