Optical and Infrared Counterparts of the X-Ray Sources Detected in the Chandra Cygnus OB2 Legacy Survey

Guarcello, M. G.; Drake, J. J.; Wright, N. J.; Naylor, T.; Flaccomio, E.; Kashyap, V. L.; García-Alvarez, D.

doi:10.3847/1538-4365/acdd64

Optical and Infrared Counterparts of the X-Ray Sources Detected in the Chandra Cygnus OB2 Legacy Survey

Guarcello, M. G.; Drake, J. J.; Wright, N. J.; Naylor, T.; Flaccomio, E.; Kashyap, V. L.; García-Alvarez, D.

Authors

M. G. Guarcello

J. J. Drake

Nicholas Wright n.j.wright@keele.ac.uk

T. Naylor

E. Flaccomio

V. L. Kashyap

D. García-Alvarez

Abstract

The young massive OB association Cygnus OB2, in the Cygnus X complex, is the closest (∼1400 pc) star-forming region to the Sun hosting thousands of young low-mass stars and up to 1000 OB stars, among which are some of the most massive stars known in our Galaxy. This region holds great importance for several fields of modern astrophysics, such as the study of the physical properties of massive and young low-mass stars and the feedback provided by massive stars on star and planet formation processes. Cyg OB2 has been recently observed with Chandra/ACIS-I as part of the 1.08 Ms Chandra Cygnus OB2 Legacy Project. This survey detected 7924 X-ray sources in a square degree area centered on Cyg OB2. Since a proper classification and study of the observed X-ray sources also requires the analysis of their optical and infrared counterparts, we combined a large and deep set of optical and infrared catalogs available for this region with our new X-ray catalog. In this paper we describe the matching procedure and present the combined catalog containing 5703 sources. We also briefly discuss the nature of the X-ray sources with optical and infrared counterparts using their position in the color–magnitude and color–color diagrams.

Citation

Guarcello, M. G., Drake, J. J., Wright, N. J., Naylor, T., Flaccomio, E., Kashyap, V. L., & García-Alvarez, D. (2023). Optical and Infrared Counterparts of the X-Ray Sources Detected in the Chandra Cygnus OB2 Legacy Survey. Astrophysical Journal Supplement, 269(1), 9. https://doi.org/10.3847/1538-4365/acdd64

Journal Article Type	Article
Acceptance Date	Feb 2, 2017
Online Publication Date	Oct 25, 2023
Publication Date	Nov 1, 2023
Deposit Date	Oct 30, 2023
Publicly Available Date	Oct 30, 2023
Journal	The Astrophysical Journal Supplement Series
Print ISSN	0067-0049
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	269
Issue	1
Pages	9
DOI	https://doi.org/10.3847/1538-4365/acdd64
Keywords	Catalogs, Astronomy databases

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