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

Nicholas J. Wright; Jeremy J. Drake; Mario G. Guarcello; Tom L. Aldcroft; Vinay L. Kashyap; Francesco Damiani; Joe DePasquale; Antonella Fruscione

doi:10.3847/1538-4365/acdd62

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

Nicholas J. Wright, Jeremy J. Drake, Mario G. Guarcello, Tom L. Aldcroft, Vinay L. Kashyap, Francesco Damiani, Joe DePasquale, Antonella Fruscione

Centre for Astrophysics Research (CAR)

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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.

Original language	English
Article number	7
Pages (from-to)	1-14
Number of pages	14
Journal	Astrophysical Journal, Supplement Series
Volume	269
Issue number	1
Early online date	25 Oct 2023
DOIs	https://doi.org/10.3847/1538-4365/acdd62
Publication status	Published - 1 Nov 2023

Keywords

pre-main sequence stars
massive stars
X-rays stars

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© 2023, The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
Final published version, 1.16 MBLicence: CC BY

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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.",

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AU - Kashyap, Vinay L.

AU - Damiani, Francesco

AU - DePasquale, Joe

AU - Fruscione, Antonella

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

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