Winter 1999-2000 Working Database (TMASSS) and Catalog Completeness Results

The purpose of this analysis is to determine the INTERNAL completeness of the point sources in the 2MASS Winter 1999-2000 Working Database (TMASSS) and the Catalog Release.
Point sources from the overlapping edges of adjacent survey tiles were used in this analysis.
Tiles were selected based on galactic latitude. A set was selected at 70 degrees GLAT (tiles 12911-12948) and another at 20 degrees GLAT (tiles 6871-6931).
Sources within the overlap region having two apparitions are assigned a 2 out of 2 weight. Sources within the overlapping region having one apparition are assigned a 1 out of 2 weight. Any source falling near the edge of the scan (within 10") would not be included in the analysis. All apparitions were considered a match if they were within a 2" radius.

Summary for Tiles 6871-6931 Using TMASSS

# Singletons in Overlap Regions
# Removed
No Counterpart in TMASS
due to Distance to Edge
# Examined
J Mag < 16
# Removed
J Mag < 16
# Examined
J Mag > 16 and
H Mag or J Mag < 14
# Removed
J Mag > 16 and
H Mag or J Mag < 14
Total removed
see Table A
# Kept
see Table B
3200
587
147
117
4
4
121
30

Table A: Sources Removed (6871-6931) TMASSS

Reason
#
Confusion
Bright Star, Diffraction Spikes
80
Confusion
Doubles, Triples, Galaxies
37
Streak Artifacts
4

Table B: Sources Kept (6871-6931) TMASSS

Reason
#
Real with Persistence
18
Real
Counterpart in TMASS
Filtered from TMASSS
Due to High Sigmas, Persistence
10
Real on Diffraction Spike
1

The following results are completeness plots for TMASSS pt_src database:
Results for 6871-6931 Jm.
6871-6931 Hm.
6871-6931 Km.



Of the 2491 singleton sources left in TMASSS completeness analysis,
1271 had use_src flag set to zero and did not make it into the final Catalog.
Therefore, another set of completeness plots were made to reflect the actual sources that are in the final Catalog.

The following results are completeness plots for pt_src_cat database:
Results for 6871-6931 Jm.
6871-6931 Hm.
6871-6931 Km.

NOTE: Some real sources (6 out of 10) where DROPPED between TMASSS and final Catalog due to the use_src flag being set to zero.
This suggests that the counterpart that was filtered from TMASSS had the better geometric position from the edge but since it was not in TMASSS,
the singleton received a use_src = 0 flag setting.

Results for 12911-12948 Jm.
12911-12948 Hm.
12911-12948 Km.





Comments and feedback: Sherry Wheelock
email: slw@ipac.caltech.edu
Last update: 29 Febuary 2000 slw@ipac.caltech.edu