The SuperCOSMOS all-sky galaxy catalogue

Understand

We describe the construction of an all-sky galaxy catalogue, using SuperCOSMOS scans of Schmidt photographic plates from the UKST and POSS2 surveys.

• The photographic photometry is calibrated using SDSS data, with results that are linear to 2% or better.
• All-sky photometric uniformity is achieved by matching plate overlaps and also by requiring homogeneity in optical-to-2MASS colours, yielding zero points that are uniform to 0.03 mag.
• or better.