• Select appropriate Chandra Fields
• Multi-method X-ray source detection (VTP, wavelet, sliding cell)
• Optical Imaging: Identification and Classification
• Optical Spectroscopy: redshift determination
• Radio Classification
• Infrared Imaging

• ~arcsecond point spread function and low background
• flux limits 10-100 × fainter
• ~arcsec positions
• enhanced determination of source extent and morphology

30 ksec CHANDRA SIMULATION ACIS-I 16´ × 16´ Click to enlarge image a,b,c... ROSAT sources detected in 30ksec   Chandra vs. ROSAT # Sources 80 14 Relative Positional error 0.5´´ 20´´ No. of counterparts 1 several Source j resolved unresolved

ACIS-I SIMULATION ROSAT vs. Chandra IDs Click to enlarge image 2´ × 2´ optical DSS-II images around each ROSAT-detected source above. The smoothed inner 4.5s Chandra contours have a radius ~ 6´´. i.e. ~ 2 × the actual positional uncertainty in the corners of the ACIS-I FoV. Typical ROSAT PSPC positional uncertainties (~ 20´´; outer circles) in many cases include multiple optical candidates. Chandra source IDs are less ambiguous.

Date Last Modified: 22 April 2002
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