A Pacemaker with P=2.48 hour Modulated the Generator of Flares in the X-ray Light Curve of Sgr A* in the year 2012

Abstract

In an intensive observational campaign in the 9 month duration of Chandra X-ray Visionary Project that was conducted in the year 2012, 39 large X-ray flares of Sgr A* were recorded. An analysis of the times of the observed flares reveals that the 39 flares are separated in time by intervals that are grouped around integer numbers times 0.10333 days. This time interval is thus the period of a uniform grid of equally spaced points on the time axis. The grouping of the flares around tic marks of this grid is derived from the data with at least a 3.2 σ level of statistical significance. No signal of any period can be found among 22 flares recorded by Chandra in the years 2013-2014. If the 0.10333 d period is that of a nearly circular Keplerian orbit around the blackhole at the center of the Galaxy, its radius is at 7.6 Schwarzschild radii. Large flares were more likely to be triggered when the agent responsible for their outbursts was near the peri-center phase of its slightly eccentric orbit.

arXiv commentAccepted for publication in New Astronomy

References in corpus (13)

• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre
• Foundations of Black Hole Accretion Disk Theory
• Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way
• Mass-radius relation of low and very low-mass stars revisited with the VLTI
• A Chandra/HETGS Census of X-ray Variability From Sgr A* During 2012
• Imaging Bright Spots in the Accretion Flow Near the Black Hole Horizon of Sgr A*
• Fifteen years of XMM-Newton and Chandra monitoring of Sgr A*: Evidence for a recent increase in the bright flaring rate
• The evidence for and against astronomical impacts on climate change and mass extinctions: A review
• Statistics of X-ray flares of Sagittarius A*: evidence for solar-like self-organized criticality phenomenon
• Universal Behavior of X-ray Flares from Black Hole Systems
• Quasi periodic oscillations in active galactic nuclei

Cited by in corpus (3)

• Possible evidence from the flaring activity of Sgr A* for a star at a distance of ~3.3 Schwarzscild radii from the blackhole
• A 149 minute periodicity underlies the X-ray flaring of Sgr A*
• The orbit and nature of the semi-detached stellar companion of Sgr A* super-massive blackhole