No Sign of G2's Encounter Affecting Sgr A*'s X-Ray Flaring Rate from Chandra Observations

被引:13
作者
Bouffard, Elie [1 ,2 ]
Haggard, Daryl [1 ,2 ]
Nowak, Michael A. [3 ]
Neilsen, Joseph [4 ]
Markoff, Sera [5 ]
Baganoff, Frederick K. [6 ]
机构
[1] McGill Univ, McGill Space Inst, 3600 Rue Univ, Montreal, PQ H3A 2T8, Canada
[2] McGill Univ, Dept Phys, 3600 Rue Univ, Montreal, PQ H3A 2T8, Canada
[3] Washington Univ, Dept Phys, One Brookings Dr, St Louis, MO 63130 USA
[4] Villanova Univ, Mendel Hall,Room 263A,800 Lancaster Ave, Villanova, PA 19085 USA
[5] Univ Amsterdam, Astron Inst Anton Pannekoek, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands
[6] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA
基金
加拿大自然科学与工程研究理事会;
关键词
SUPERMASSIVE BLACK-HOLE; ACCRETION FLOW MODELS; XMM-NEWTON; SYSTEMATIC CHANDRA; EMISSION; EVOLUTION; BINARY; MASS;
D O I
10.3847/1538-4357/ab4266
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
y An unusual object, G2, had its pericenter passage around Sgr A*, the 4 x 10(6)M(circle dot) supermassive black hole in the Galactic Center, in Summer 2014. Several research teams have reported evidence that, following G2's pericenter encounter, the rate of Sgr A*'s bright X-ray flares increased significantly. Our analysis carefully treats varying flux contamination from a nearby magnetic neutron star and is free from complications induced by using data from multiple X-ray observatories with different spatial resolutions. We test the scenario of an increased bright X-ray flaring rate using a massive data set from the Chandra X-ray Observatory, the only X-ray instrument that can spatially distinguish between Sgr A* and the nearby Galactic Center magnetar throughout the full extended period encompassing G2's encounter with Sgr A*. We use X-ray data from the 3 Ms observations of the Chandra X-ray Visionary Program (XVP) in 2012, as well as an additional 1.5 Ms of observations up to 2018. We use detected flares to make distributions of flare properties. Using simulations of X-ray flares accounting for important factors such as the different Chandra instrument modes, we test the null hypothesis on Sgr A*'s bright (or any flare category) X-ray flaring rate around different potential change points. In contrast to previous studies, our results are consistent with the null hypothesis; the same model parameters produce distributions consistent with the observed ones around any plausible change point.
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页数:16
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