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- W199668730 abstract "Abstract. As part of the development of the Chandra Level 3 (L3) dataproducts (Chandra Source catalog) the impacts of the ACIS Readout Streakand Pileup have been examined. A method has been developed which allowsus to determine, for a given observation, which columns of the ACIS CCDsare impacted by Readout Streaks, resulting in the detection of false sources. Adiscussion is given of how to use this information to prevent false detections andhow to identify and determine the characteristics of real sources located in theReadout Streak. The implications of this for the creation of L3 products arediscussed. 1. IntroductionX-Ray observations made with the Chandra Advanced CCD Imaging Spectrom-eter(ACIS)containingbrightX-raysourcesoftencontainaReadout Streak. Thissteak is the result of the finite amount of time (40 µsec per row) that it takes toread out the CCD after an integration period. As a result all pixels along a givenreadout channel are exposed to all points on the sky that lie along that readoutchannel. The result is a streak along channels which contain a bright source.This streak can cause problems when one is trying to detect, and determine theproperties of, the X-ray sources in the data.Currently under development is the Chandra Level 3 (L3) data products(Chandra Source Catalog). This project seeks to do source detection on allpublic Chandra data (∼ 4200 observations) and create data products for allsources which are found. Due to the number of observations it is important toautomate the source detection and minimize the number of spurious sources. Astrong Readout Streak can easily cause on the order of 100 false sources beingfound.Figure 1a is an image of the S3 chip of an observation of M81 (OBSID: 735).Apparent is the Readout Streak of the central X-ray source and to a lesserextent the Readout Streak of the ultra-luminous object X6 (to the left edge ofthe image). Overlayed are the sources detected from a run of WAVDETECT(see Freeman et al. 2002). It is apparent that a large number of false sourcesdetected are caused by the Readout Streak with 60 of the 158 sources along theReadout Streak. We describe a simple algorithm to address this problem.478" @default.
- W199668730 created "2016-06-24" @default.
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- W199668730 date "2005-12-01" @default.
- W199668730 modified "2023-09-24" @default.
- W199668730 title "The Impact of the ACIS Readout Streak and Pileup on Chandra Source Detection" @default.
- W199668730 hasPublicationYear "2005" @default.
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