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Brightening X-ray Emission from GW170817/GRB170817A: Further Evidence for an Outflow
John J. Ruan, Melania Nynka, Daryl Haggard +2
The origin of the X-ray emission from neutron star coalescence GW170817/GRB170817A is a key diagnostic of the unsettled post-merger narrative, and different scenarios predict disti…
A Deep Chandra X-ray Study of Neutron Star Coalescence GW170817
Daryl Haggard, Melania Nynka, John J. Ruan +4
We report Chandra observations of GW170817, the first neutron star-neutron star merger discovered by the joint LIGO-Virgo Collaboration, and the first direct detection of gravitati…
Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 during the initial 3.5 years of outburst decay
F. Coti Zelati, N. Rea, R. Turolla +15
We report on 3.5 years of Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 since its outburst onset in April 2013. The magnetar spin-down has shown at least two ep…
Simultaneous Monitoring of X-ray and Radio Variability in Sagittarius A*
Daniel M. Capellupo, Daryl Haggard, Nicolas Choux +14
Monitoring of Sagittarius A* from X-ray to radio wavelengths has revealed structured variability --- including X-ray flares --- but it is challenging to establish correlations betw…
The Chandra Dust Scattering Halo of Galactic Center transient Swift J174540.7-290015
L. Corrales, B. Mon, D. Haggard +4
We report the detection of a dust scattering halo around a recently discovered X-ray transient, Swift J174540.7-290015, which in early February of 2016 underwent one of the brighte…
A powerful flare from Sgr A* confirms the synchrotron nature of the X-ray emission
G. Ponti, E. George, S. Scaringi +21
We present the first fully simultaneous fits to the NIR and X-ray spectral slope (and its evolution) during a very bright flare from Sgr A*, the supermassive black hole at the Milk…
Low Mass X-Ray Binaries in the Inner Galaxy: Implications for Millisecond Pulsars and the GeV Excess
Daryl Haggard, Craig Heinke, Dan Hooper +1
If millisecond pulsars (MSPs) are responsible for the excess gamma-ray emission observed from the region surrounding the Galactic Center, the same region should also contain a larg…