Examples of No Phase 2 Screening in Case of Complex Targets:


 

Very bright extended smooth source (galaxy cluster):

[001091-PN] [001091-PN] [001091-PN]
 EPIC PN image (netscape)  EPIC PN image with sources overlaid (netscape)  EPIC PN image with sources overlaid (ds9): no obvious patch of spurious sources identifiable among the real sources.
 

 

Very bright extended clumpy source (SNR):

[000935-PN] [000935-PN] [000935-PN]
 EPIC PN image (netscape)  EPIC PN image with sources overlaid (netscape)  EPIC PN image with sources overlaid (ds9): even single sources away from areas with spurious detections are unrecognizable.
 

 

Bright filamentary extended source:

[000925-PN] [000925-PN] [000925-PN]
 EPIC PN image (netscape)  EPIC PN image with sources overlaid (netscape)  EPIC PN image with sources overlaid (ds9): the bright filamentary structure makes it difficult to recognize areas with spurious detections.
 

 

Clumpy extended source mixed with many real sources:

[000607-PN] [000607-PN] [000607-PN]
 EPIC PN image (netscape)  EPIC PN image with sources overlaid (netscape)  EPIC PN image with sources overlaid (ds9): real and spurious sources are mixed and can not be discriminated.
 

 

Smooth extended source mixed with many real sources (M31 core):

[000605-PN] [000605-PN] [000605-PN]
 EPIC PN image (netscape)  EPIC PN image with sources overlaid (netscape)  EPIC PN image with sources overlaid (ds9): a ring of spurious detections is discernible but the real and spurious sources can not be discriminated. In addition, many sources are missed.
 

 

Medium bright smooth extended source with many real sources mixed (galaxy cluster):

[001581-PN] [001581-PN] [001581-PN]
 EPIC PN image (netscape)  EPIC PN image with sources overlaid (netscape)  EPIC PN image with sources overlaid (ds9): there are few or no spurious sources but they are indistinguishable from real sources on the bright background
 

 

Bright reflection arcs mixed with many real sources:

[001446-PN] [001446-PN] [001446-PN]
 EPIC PN image (netscape)  EPIC PN image with sources overlaid (netscape)  EPIC PN image with sources overlaid (ds9): sources and reflection arcs are in some regions indistinguishable.


Screening Notes Example: Version 29.05.2003