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| Robust Source Detection Limits for Chandra Observations |
| Category:
05. Data Analysis and Modeling Techniques |
Thomas L. Aldcroft1, P. Green1, V. Kashyap1, D. Kim1, J. Connelly1
1Harvard-Smithsonian, CfA. |
| Presentation Number: 04.02 |
| Facility Keywords:
Chandra |
| We present a novel method for estimating the source detection limits in Chandra observations using the count threshold map produced by the CIAO wavdetect tool. This is particularly useful for multiwavelength analysis of X-ray non-detections at the position of prior sources, for instance known optically-selected AGN from the SDSS that are covered in the ChaMP survey. Because the Chandra PSF and detector characteristics are highly position dependent, a robust estimate of the detection limit at a particular location is not easily obtained. However, the CIAO wavdetect tool can produce a count threshold map at each wavelet scale that explicitly accounts for such effects. Taking advantage of a large body of source detection simulations previously done for the ChaMP effective area calculation, we derive an empirical correlation that uses the threshold map to predict the spatially dependent count limit at which 50% and 90% of sources are detected. We have verified this algorithm using the 2 Msec Chandra Deep Field South data. |
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