The Chandra Cygnus OB2 Legacy Survey: Design and X-Ray Point-source Catalog

Journal
Date Issued
2023
Author(s)
Wright, Nicholas J.
•
Drake, Jeremy J.
•
•
Aldcroft, Tom L.
•
Kashyap, Vinay L.
•
•
DePasquale, Joe
•
Fruscione, Antonella
DOI
Abstract
The Cygnus OB2 association is the largest concentration of young and massive stars within 2 kpc of the Sun, including an estimated ∼65 O-type stars and hundreds of OB stars. The Chandra Cygnus OB2 Legacy Survey is a large imaging program undertaken with the Advanced CCD Imaging Spectrometer on board the Chandra X-ray Observatory. The survey has imaged the central 0.5 deg2 of the Cyg OB2 association with an effective exposure of ∼120 ks and an outer 0.35 deg2 area with an exposure of ∼60 ks. Here we describe the survey design and observations, discuss the data reduction and source detection, and present a catalog of ∼8000 X-ray point sources. The survey design employs a grid of 36 heavily (∼50%) overlapping pointings, a method that overcomes Chandra's low off-axis sensitivity and produces a highly uniform exposure over the inner 0.5 deg2. The full X-ray catalog is described here and is made available online.
Volume
269
Issue
1
Start page
7
Uri
Url
Issn Identifier
0067-0049
Rights
open.access
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