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Quiescent NIR and optical counterparts to candidate black hole X-ray binaries
K. M. López, P. G. Jonker, M. A. P. Torres +3
We present near-infrared and optical imaging of fifteen candidate black hole X-ray binaries. In addition to quiescent observations for all sources, we also observed two of these so…
The Fast, Luminous Ultraviolet Transient AT2018cow: Extreme Supernova, or Disruption of a Star by an Intermediate-Mass Black Hole?
Daniel A. Perley, Paolo A. Mazzali, Lin Yan +60
Wide-field optical surveys have begun to uncover large samples of fast (t_rise < 5d), luminous (M_peak < -18), blue transients. While commonly attributed to the breakout of a super…
A tale of two periods: determination of the orbital ephemeris of the super-Eddington pulsar NGC 7793 P13
F. Fuerst, D. J. Walton, M. Heida +10
We present a timing analysis of multiple XMM-Newton and NuSTAR observations of the ultra-luminous pulsar NGC 7793 P13 spread over its 65d variability period. We use the measured pu…
Characterisation of a candidate dual AGN
D. Lena, G. Panizo-Espinar, P. G. Jonker +2
We present Chandra and optical observations of a candidate dual AGN discovered serendipitously while searching for recoiling black holes via a cross-correlation between the serendi…
A Potential Cyclotron Resonant Scattering Feature in the ULX Pulsar NGC 300 ULX1 seen by NuSTAR and XMM-Newton
D. J. Walton, M. Bachetti, F. Fuerst +14
Based on phase-resolved broadband spectroscopy using - and , we report on a potential cyclotron resonant scattering feature at keV in the pulsed sp…
Evidence for Pulsar-like Emission Components in the Broadband ULX Sample
D. J. Walton, F. Fuerst, M. Heida +7
We present broadband X-ray analyses of a sample of bright ultraluminous X-ray sources with the goal of investigating the spectral similarity of this population to the known ULX pul…