All-sky Galaxy catalogue
The purpose of this page is to make directly available the SuperCOSMOS
all-sky galaxy catalogue, generated from scans of the UKST and POSS2
photographic Schmidt surveys and described
in Peacock et
al. (2016). This optical material was matched with WISE to produce
WISExSCOS photometric redshift catalogue.
What is released
- A table of objects to optical limits of B<21.5, R<20; this is deeper than the limits
adopted in the WISExSCOS work, allowing users to vary the limit if desired.
The columns are objID, ra, dec, Bmag, Bcal, Bcc, Rmag, Rcal, Rcc, Imag, Ical, Icc, Ebmv.
The various magnitudes are observed (mag), adjusted for the slight hemispheric offset between
photometric systems as described in Peacock et al. (cal); further corrected for
- An additional table of objects that fill holes in the sky coverage left by
calibration stepwedges on the plates. Mainly affecting POSS2 scans, these regions
are omitted in the standard SSA
database, although they can be accessed from the original SuperCOSMOS scans by using
regions from an adjoining plate beyond the default central 5 x 5 degrees. The data
in these regions is lower in quality, so we include only objects that paired
up with WISE. The full SuperCOSMOS all-sky catalogue should be considered to
consist of the main table plus these additional objects.
- A table of calibration properties for the photographic plates that
are the basis for the catalogue. Columns are
Field number, B-band linearity, zero point, slump coefficient (and same for R & I);
the three coefficients are defined in equations 9 & 11 of Peacock et al. (2016).
The plate-centre positions of the UKST and POSS2 plates are listed in
The POSS2 field numbers have been increased by 1000, in order to have a unique
number over the whole sky. This information may be used if desired to mask out
plates of lower depth as diagnosed by the zero point.
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||all-sky galaxy catalogue
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||catalogue from step-wedge regions
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||field calibration parameters
WFAU, Institute for Astronomy,
Royal Observatory, Blackford Hill
Edinburgh, EH9 3HJ, UK