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http://hdl.handle.net/20.500.12386/24440
Titolo: | A 78 Day X-Ray Period Detected from NGC 5907 ULX1 by Swift | Autori: | Walton, D. J. Fürst, F. BACHETTI, Matteo Barret, D. Brightman, M. Fabian, A. C. Gehrels, N. Harrison, F. A. Heida, M. Middleton, M. J. Rana, V. Roberts, T. P. Stern, D. Tao, L. Webb, N. |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 827 | Fascicolo: | 1 | Da pagina:: | L13 | 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}<SUB>{{X,peak</SUB>}}∼ 5× {10}<SUP>40</SUP> erg s<SUP>-1</SUP>), 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. | URI: | http://hdl.handle.net/20.500.12386/24440 | URL: | https://iopscience.iop.org/article/10.3847/2041-8205/827/1/L13/meta | ISSN: | 0004-637X | DOI: | 10.3847/2041-8205/827/1/L13 | Bibcode ADS: | 2016ApJ...827L..13W | Fulltext: | open |
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