Optical variability of the ultraluminous X-ray source NGC 1313 X-2

Abstract

We analyzed the longest phase-connected photometric dataset available for NGC 1313 X-2, looking for the ~6 day modulation reported by Liu et al. (2009). The folded B band light curve shows a 6 days periodicity with a significance slightly larger than 3 sigma. The low statistical significance of this modulation, along with the lack of detection in the V band, make its identification uncertain.

4 pages, 2 figures. Accepted for publication in the Astronomische Nachrichten (Astronomical Notes), to appear in the proceedings of the conference "Ultra-Luminous X-ray sources and Middle Weight Black Holes" (Madrid, May 24-26, 2010)

References in corpus (6)

• Spectral State Transitions of the Ultraluminous X-ray Sources X-1 and X-2 in NGC 1313
• The ultraluminous X-ray source NGC 1313 X-2 - Its optical counterpart and environment
• A Revised Characterization of the WFPC2 CTE Loss
• New Hubble Space Telescope imaging of the counterparts to six ultraluminous X-ray sources
• The long-term evolution of the accreting millisecond X-ray pulsar Swift J1756.9-2508
• The black hole in NGC 1313 X-2: constraints on the mass from optical observations

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• Irradiated, colour-temperature-corrected accretion discs in ultraluminous X-ray sources