The Chandra COSMOS Survey, I: Overview and Point Source Catalog
Martin Elvis, Francesca Civano, Cristian Vignali, Simonetta Puccetti,, Fabrizio Fiore, Nico Cappelluti, T. L. Aldcroft, Antonella Fruscione, G., Zamorani, Andrea Comastri, Marcella Brusa, Roberto Gilli, Takamitsu Miyaji,, Francesco Damiani, Anton Koekemoer, Alexis Finoguenov

TL;DR
The Chandra COSMOS Survey provides a comprehensive X-ray point source catalog over a large area with uniform exposure, employing a novel detection method to identify nearly 1800 sources with high reliability.
Contribution
This paper introduces the survey design, execution, and a new source detection technique tailored for overlapping Chandra observations in the COSMOS field.
Findings
Detected 1761 X-ray point sources with high confidence.
Achieved a uniform exposure across the survey area.
Provided a detailed catalog with precise source positions.
Abstract
The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra} program that has imaged the central 0.5 sq.deg of the COSMOS field (centered at 10h, +02deg) with an effective exposure of ~160ksec, and an outer 0.4sq.deg. area with an effective exposure of ~80ksec. The limiting source detection depths are 1.9e-16 erg cm(-2) s(-1) in the Soft (0.5-2 keV) band, 7.3e(-16) erg cm^-2 s^-1 in the Hard (2-10 keV) band, and 5.7e(-16) erg cm(-2) s(-1) in the Full (0.5-10 keV) band. Here we describe the strategy, design and execution of the C-COSMOS survey, and present the catalog of 1761 point sources detected at a probability of being spurious of <2e(-5) (1655 in the Full, 1340 in the Soft, and 1017 in the Hard bands). By using a grid of 36 heavily (~50%) overlapping pointing positions with the ACIS-I imager, a remarkably uniform (to 12%) exposure across the inner 0.5 sq.deg field was…
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