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A NuSTAR View of GRS 1716249 in the Hard and Intermediate States
Jiachen Jiang, Felix Fürst, Dominic J. Walton +2
We present a detailed analysis of the spectral properties of the black hole transient GRS 1716-249, based on the archival Swift and NuSTAR observations taken during the outburst of…
Swift monitoring of M51: A 38-day super-orbital period for the pulsar ULX7 and a new transient ULX
Murray Brightman, Hannah Earnshaw, Felix Fürst +6
We present the results from a monitoring campaign made with the Neil Gehrels Swift Observatory of the M51 galaxies, which contain several variable ultraluminous X-ray sources (ULXs…
Discovery of a soft X-ray lag in the Ultraluminous X-ray Source NGC 1313 X-1
E. Kara, C. Pinto, D. J. Walton +14
Ultraluminous X-ray Sources (ULXs) provide a unique opportunities to probe the geometry and energetics of super-Eddington accretion. The radiative processes involved in super-Eddin…
The Unusual Broadband X-ray Spectral Variability of NGC 1313 X-1 seen with XMMNewton, Chandra and NuSTAR
D. J. Walton, C. Pinto, M. Nowak +19
We present results from the major coordinated X-ray observing program on the ULX NGC 1313 X-1 performed in 2017, combining -, and , focusing on the e…
Diffuse X-ray emission around an ultraluminous X-ray pulsar
Andrea Belfiore, Paolo Esposito, Fabio Pintore +17
Ultraluminous X-ray sources (ULXs) are extragalactic X-ray emitters located off-center of their host galaxy and with a luminosity in excess of a few ,…
An evolving broad iron line from the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124
Gaurava K. Jaisawal, Colleen A. Wilson-Hodge, Andrew C. Fabian +15
We present a spectral study of the ultraluminous Be/X-ray transient pulsar Swift J0243.6+6124 using Neutron Star Interior Composition Explorer (NICER) observations during the syste…
MAXI J1820+070 with NuSTAR I. An increase in variability frequency but a stable reflection spectrum: coronal properties and implications for the inner disc in black hole binaries
D. J. K. Buisson, A. C. Fabian, D. Barret +10
MAXI J1820+070 (optical counterpart ASASSN-18ey) is a black hole candidate discovered through its recent very bright outburst. The low extinction column and long duration at high f…
Discovery of a red supergiant donor star in SN2010da/NGC 300 ULX-1
M. Heida, R. M. Lau, B. Davies +7
SN2010da/NGC 300 ULX-1 was first detected as a supernova impostor in May 2010 and was recently discovered to be a pulsating ultraluminous X-ray source. In this letter, we present V…
Modeling the precession of the warped inner accretion disk in the pulsars LMC X-4 and SMC X-1 with NuSTAR and XMM-Newton
McKinley C. Brumback, Ryan C. Hickox, Felix S. Fürst +3
We present a broad-band X-ray study of the effect of superorbital periods on X-ray spectra and pulse profiles in the neutron star X-ray binaries LMC X-4 and SMC X-1. These two sour…
Discovery of a 2.8 s pulsar in a 2 d orbit High-Mass X-ray Binary powering the Ultraluminous X-ray source ULX-7 in M51
G. A. Rodríguez Castillo, G. L. Israel, A. Belfiore +26
We discovered 2.8 s pulsations in the X-ray emission of the ultraluminous X-ray source (ULX) M51 ULX-7 within the UNSEeN project, which was designed to hunt for new pulsating ULXs…
Vela X-1 as a laboratory for accretion in High-Mass X-ray Binaries
P. Kretschmar, S. Martínez-Núñez, F. Fürst +7
Vela X-1 is an eclipsing high mass X-ray binary (HMXB) consisting of a 283s accreting X-ray pulsar in a close orbit of 8.964 days around the B0.5Ib supergiant HD77581 at a distance…
A broadband look at the old and new ULXs of NGC 6946
Hannah P. Earnshaw, Brian W. Grefenstette, Murray Brightman +8
Two recent observations of the nearby galaxy NGC 6946 with NuSTAR, one simultaneous with an XMM-Newton observation, provide an opportunity to examine its population of bright accre…
All at once: transient pulsations, spin down and a glitch from the Pulsating Ultraluminous X-ray Source M82 X-2
Matteo Bachetti, Thomas J. Maccarone, Murray Brightman +9
M82 X-2 is the first pulsating ultraluminous X-ray source (PULX)to be identified. Since the discovery in 2014, NuSTAR has observed the M82 field 15 times throughout 2015 and 2016.…
Uncovering Red and Dusty Ultraluminous X-ray Sources with Spitzer
Ryan M. Lau, Marianne Heida, Dominic J. Walton +9
We present a mid-infrared (IR) sample study of nearby ultraluminous X-ray sources (ULXs) using multi-epoch observations with the Infrared Array Camera (IRAC) on the Spitzer Space T…
Observing the transient pulsations of SMC X-1 with NuSTAR
Sean N. Pike, Fiona A. Harrison, Matteo Bachetti +6
We report on NuSTAR observations of transient pulsations in the neutron star X-ray binary SMC X-1. The transition from non-pulsing to pulsing states was not accompanied by a large…
A ~60-day super-orbital period originating from the ultraluminous X-ray pulsar in M82
Murray Brightman, Fiona A. Harrison, Matteo Bachetti +6
Ultraluminous X-ray (ULX) pulsars are a new class of object powered by apparent super-critical accretion onto magnetized neutron stars. Three sources in this class identified so fa…
Searching for the Donor Stars of ULX Pulsars
M. Heida, F. A. Harrison, M. Brightman +3
We report on our search for the optical counterparts of two ultraluminous X-ray pulsars with known orbital periods, M82 X-2 and NGC 5907 X-1, in new and archival HST observations,…