DUP_SRC Setting for Final Catalog Release
DUP_SRC flag is an integer with values between 0 and 5. It is set during the duplicate resolution process.
The setting of this flag has changed since the Second IDR. In the Final Catalog release,
information regarding source confusion is carried in the DUP_SRC.
Confusion is defined as multiple apparitions found in a single overlapping scan within the search radius, 2" for point sources. Any source with a DUP_SRC > 1 is part of a confused cluster.
The following defines the DUP_SRC settings for the final processing.
- "0": no match found within 2" radius on overlapping scan OR apparition not in overlap region
- "1": single match between at least one overlapping scan. No confusion found.
- "3": Trianglular confusion found with pattern outlined
a1 finds match with b1 and b2
b1 matches with a1 and
b2 matches with a1
One scan has a split source while the source is not split in the overlapping scan.
- "4": Confusion between two scans each having two apparitions.
a1 finds match with b1 and b2
a2 finds match with b1 and b2
b1 finds match with a1 and a2
b2 finds match with a1 and a2
Both scans have the source split.
- "5": Confusion chain
a1 finds match with b1
b1 finds match with a1 and a2
a2 finds match with b2
A one, _1, appended to the DUP_SRC flag indicates the USE_SRC flag for the source has changed at least once during the duplicate resolution processing.
For confused sources assignment of the USE_SRC flag can change depending on the
order of scan processing. The apparition receiving the final
USE_SRC of 1 in confused source clusters depends on the geometric algorithm.
No other logic determines this.
[Last Updated: 2002 Oct 30; by Sherry Wheelock]