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Interpretation of the 115 Day Periodic Modulation in the X-ray Flux of NGC 5408 X-1

We comment on the recent observation of a 115-day modulation in the X-ray flux of the ultraluminous X-ray source (ULX) NGC 5408 X-1, and in particular, the interpretation of this modulation as the orbital period. We suggest that this modulation may instead be due to a precessing jet, and is thus superorbital in nature. Comparing the properties of this ULX with those of the prototypical microquasar SS 433, we argue that NGC 5408 X-1 is very similar to SS 433: a hyper-accreting stellar mass black hole in a shorter-period binary. If the analogy holds, the 115-day modulation is best explained by the still poorly-understood physics of inner-disc/jet precession and a longer observing baseline would be able to reveal an intrinsic phase jitter that is associated with such a precession.

preprint2010arXivOpen access
Deatrick FosterPhil CharlesKelly Holley-Bockelmann
astro-ph.COastro-ph.HE
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Deatrick FosterPhil CharlesKelly Holley-Bockelmann

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