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Astrometric excess noise in Gaia EDR3 and the search for X-ray binaries

Astrometric excess noise in Gaia EDR3 and the search for X-ray binaries
Astrometric excess noise in Gaia EDR3 and the search for X-ray binaries
Astrometric noise (ϵ) in excess of parallax and proper motion is a potential signature of orbital wobble (ω) of individual components in binary star systems. The combination of X-ray selection with astrometric noise could then be a powerful tool for robustly isolating accreting binaries in large surveys. Here, we mine the Gaia EDR3 catalogue for Galactic sources with significant values of astrometric noise over the parameter space expected for known and candidate X-ray binaries (XRBs). Cross-matching our sample with the Chandra Source Catalogue returns a primary sample of ≈6500 X-ray sources with significant ϵ. X-ray detection efficiency for objects with significant ϵ is a factor of ≈4.5 times higher than in a matched control sample exhibiting low ϵ. The primary sample branches off the main sequence much more than control objects in colour–mag space, and includes a higher fraction of known binaries, variables, and young stellar object class types. However, values of ϵ reported in the Gaia pipeline releases so far can exceed expectations for individual XRBs with known semimajor axis size and other system parameters. It is likely that other factors (possibly attitude and modelling uncertainties, as well as source variability) currently dominate the observed excess noise in such systems. Confirmation of their nature must therefore await future Gaia releases. The full X-ray matched catalogue is released here to enable legacy follow-up.
0035-8711
3885–3895
Gandhi, Poshak
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Charles, Philip
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Knigge, Christian
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Rao, Anjali
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Paice, John A
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Zhao, Yue
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Buckley, D.A.H.
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Hodgkin, S.
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Scaringi, S.
5a05d9eb-9bfb-455a-abb1-b1ed3229f977
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Charles, Philip
0429b380-0754-4dc1-8def-885c7fa6a086
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Rao, Anjali
3a3aa402-cf58-4724-9e63-fe9fdc6f39a6
Paice, John A
8ac21dae-fc44-4797-b2aa-31125c9172ae
Zhao, Yue
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Buckley, D.A.H.
2b82e4e2-d175-4cb3-9868-46b13f4f890c
Hodgkin, S.
bcec9745-43aa-4c29-8a76-778d235eba0f
Scaringi, S.
5a05d9eb-9bfb-455a-abb1-b1ed3229f977

Gandhi, Poshak, Charles, Philip, Knigge, Christian, Rao, Anjali, Paice, John A, Zhao, Yue, Buckley, D.A.H., Hodgkin, S. and Scaringi, S. (2021) Astrometric excess noise in Gaia EDR3 and the search for X-ray binaries. Monthly Notices of the Royal Astronomical Society, 510 (3), 3885–3895. (doi:10.1093/mnras/stab3771).

Record type: Article

Abstract

Astrometric noise (ϵ) in excess of parallax and proper motion is a potential signature of orbital wobble (ω) of individual components in binary star systems. The combination of X-ray selection with astrometric noise could then be a powerful tool for robustly isolating accreting binaries in large surveys. Here, we mine the Gaia EDR3 catalogue for Galactic sources with significant values of astrometric noise over the parameter space expected for known and candidate X-ray binaries (XRBs). Cross-matching our sample with the Chandra Source Catalogue returns a primary sample of ≈6500 X-ray sources with significant ϵ. X-ray detection efficiency for objects with significant ϵ is a factor of ≈4.5 times higher than in a matched control sample exhibiting low ϵ. The primary sample branches off the main sequence much more than control objects in colour–mag space, and includes a higher fraction of known binaries, variables, and young stellar object class types. However, values of ϵ reported in the Gaia pipeline releases so far can exceed expectations for individual XRBs with known semimajor axis size and other system parameters. It is likely that other factors (possibly attitude and modelling uncertainties, as well as source variability) currently dominate the observed excess noise in such systems. Confirmation of their nature must therefore await future Gaia releases. The full X-ray matched catalogue is released here to enable legacy follow-up.

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Accepted/In Press date: 16 December 2021
Published date: 28 December 2021
Additional Information: arXiv:2201.00833

Identifiers

Local EPrints ID: 457601
URI: http://eprints.soton.ac.uk/id/eprint/457601
ISSN: 0035-8711
PURE UUID: 24b53795-16fc-4561-90ee-12e58becfe71
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 13 Jun 2022 17:12
Last modified: 22 Oct 2022 01:45

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Contributors

Author: Poshak Gandhi ORCID iD
Author: Philip Charles
Author: Anjali Rao
Author: John A Paice
Author: Yue Zhao
Author: D.A.H. Buckley
Author: S. Hodgkin
Author: S. Scaringi

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