Table 1
Selection parameters used in the VASCA pipeline.
| Variable | Description | Value |
|---|---|---|
| Detection quality selection | ||
| S2N | Signal to noise | >3 |
| Rfov | Distance to the center of the FoV | <0.5 deg |
| ELLIPworld | Ellipticity | <0.5 |
| SIZEworld | Circular extension | <6″ |
| CLASSstar | Extended (0) or point like (1) | >0.15 |
| CHKOBJtype | Matched to a bright star (0=no, 1 = yes) | 0 |
| APPRATIOflux | Ratio of flux calculated with apertures of 3.8 to 6.0″ | 0.3 to 1.05 |
| ARTIFACTS | Detections on-top of variable/hot pixels and of optical reflections are ignored | 2, 4, 8, 128 and 256 |
| Variable source selection | ||
| FLUX | Spectral flux density | 0.145µJy to 575.4µJy |
| Ndet | Number of detections | >3 |
| PVALflux | Probability of constant flux | <5.73 × 10−7 |
| NXVflux | Flux normalized excess variance | >0.001 (>0.01) |
| FRATIOco | Ratio of the mean flux to the co-add flux | >2 |
 |
Signal to noise of the flux to co-add flux difference | >7 |
| QVALpos | Cluster position quality parameter | <5.73 × 10−7 |
| XVpos | Positional excess variance | < 2 arcsec2 |
Notes. More details on the detection variables can be found in the GALEX documentation http://www.galex.caltech.edu/wiki . The text provides additional information on the source variables. The selection parameters for the NUV and FUV bands are generally identical. However, discrepancies in the FUV parameter values, if any, are indicated in brackets.
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