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Title: A 78 Day X-ray Period Detected from NGC 5907 ULX1 by Swift
Authors: Walton, D. J.
Fuerst, F.
Rana, V
+12 Co-Authors
Keywords: black hole physics
X-rays: binaries
X-rays: individual: NGC 5907 ULX1
Issue Date: 10-Aug-2016
Publisher: IOP Sciences for American Astronomical Society
Citation: The Astrophysical Journal Letters, 2016, Vol.827, p6
Abstract: We report the detection of a 78.1 ± 0.5 day period in the X-ray light curve of the extreme ultraluminous X-ray source NGC 5907 ULX1 ({L}{{X,peak}}̃ 5× {10}40 erg s-1), discovered during an extensive monitoring program with Swift. These periodic variations are strong, with the observed flux changing by a factor of ̃3-4 between the peaks and the troughs of the cycle; our simulations suggest that the observed periodicity is detected comfortably in excess of 3σ significance. We discuss possible origins for this X-ray period, but conclude that at the current time we cannot robustly distinguish between orbital and super-orbital variations.
Description: Open Access.
ISSN: 0004-637X
1538-4357 (online)
Alternative Location:
Copyright: 2016 The American Astronomical Society.
Appears in Collections:Research Papers (A&A)

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