Periodic Modulations in an X-ray Flare from Sagittarius A*

Abstract

We present the highly significant detection of a quasi-periodic flux modulation with a period of 22.2 min seen in the X-ray data of the Sgr A* flare of 2004 August 31. This flaring event, which lasted a total of about three hours, was detected simultaneously by EPIC on XMM-Newton and the NICMOS near-infrared camera on the HST. Given the inherent difficulty in, and the lack of readily available methods for quantifying the probability of a periodic signal detected over only several cycles in a data set where red noise can be important, we developed a general method for quantifying the likelihood that such a modulation is indeed intrinsic to the source and does not arise from background fluctuations. We here describe this Monte Carlo based method, and discuss the results obtained by its application to a other XMM-Newton data sets. Under the simplest hypothesis that we witnessed a transient event that evolved, peaked and decayed near the marginally stable orbit of the supermassive black hole, this result implies that for a mass of 3.5 x 10^{6} Msun, the central object must have an angular momentum corresponding to a spin parameter of a=0.22.

4 pages, 6 figures, submitted to ApJL

References in corpus (12)

• Chandra X-ray Spectroscopic Imaging of Sgr A* and the Central Parsec of the Galaxy
• Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre
• Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
• A simple test for periodic signals in red noise
• XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
• A Multi-Wavelength Study of Sgr A*: The Role of Near-IR Flares in Production of X-ray, Soft $\gamma$-ray and Sub-millimeter Emission
• X-ray flares reveal mass and angular momentum of the Galactic Center black hole
• A New X-Ray Flare from the Galactic Nucleus Detected with the XMM-Newton Photon Imaging Cameras
• A Possible Rossby Wave Instability Origin for the Flares in Sagittarius A*
• A Persistent High-Energy Flux from the Heart of the Milky Way : Integral's view of the Galactic Center
• Repeated X-ray Flaring Activity in Sagittarius A*
• The Position of Sgr A${}^{\ast }$ at the Galactic Center

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