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Extragalactic transient candidates in the second Swift-XRT point source catalogue

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posted on 2022-09-20, 10:01 authored by RAJ Eyles-Ferris, RLC Starling, PT O'Brien, PA Evans

The second Swift-XRT Point Source catalogue offers a combination of sky coverage and sensitivity and presents an invaluable opportunity for transient discovery. We search the catalogue at the positions of inactive and active galaxies, and identify transient candidates by comparison with XMM–Newton and ROSAT. We recover 167 previously known transients and find 19 sources consistent with being new sources, estimating a completeness of $\sim 65{{\ \rm per\ cent}}$. These 19 new sources are split approximately equally between inactive and active hosts and their peak X-ray luminosities span ∼1042–1047 erg s−1. We find eight are best fit with non-thermal spectral models and one with a blackbody. We also discuss our methodology and its application to the forthcoming Living Swift-XRT Point Source catalogue for the potential near real time serendipitous discovery of ∼few new X-ray transients per year.

Funding

871158

History

Author affiliation

School of Physics and Astronomy, University of Leicester

Version

  • AM (Accepted Manuscript)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

515

Issue

3

Pagination

4402 - 4416

Publisher

Oxford University Press (OUP) for Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Copyright date

2022

Available date

2022-09-20

Language

English

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