NYU Value-Added Galaxy Catalog

lss_geometry

This file describes the geometry of the large-scale structure sample at the level of target fields. It contains a set of spherical polygons (the concept is explained well at the mangle site). For each polygon, we give pointers to which target field it corresponds to and which sector it corresponds to.

This file can be read in using the 

read_fits_polygons

tool in idlutils.

The columns are:

  1. XCAPS[3,N]: directions for each cap (as specified in the mangle documentation)
  2. CMCAPS[N]: size of each cap (as specified in the mangle documentation)
  3. NCAPS: number of caps
  4. WEIGHT: weight assigned to each cap (ignore this)
  5. STR: area of each cap in steradians
  6. USE_CAPS: bitmask designating which caps to use
  7. SECTOR: sector number in the tiling geometry (each sector is an area covered by a unique set of tiles)
  8. FGOTMAIN: fraction of targets in Main which succcessfully get redshifts in this sector
  9. MMAX: effective Main sample flux limit
  10. DIFFRUN: 1 if the "best" photometry is from a different run than the target geometry, 0 otherwise
  11. ITILING_GEOMETRY: index of the polygon in sdss_tiling_geometry file which contains this polygon
  12. ITARGET_GEOMETRY: index of the polygon in sdss_target_geometry file which contains this polygon

There is an ASCII version of this file in mangle format called lss_geometry.ply. Also, there is an associated file called lss_geometry_info.dat with the columns:

[diffrun] [itiling_geometry] [itarget_geometry] [sector] [mmax]

NYU Value-Added Galaxy Catalog