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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…
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…
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…
Dynamical confirmation of a black hole in MAXI J1820+070
M. A. P. Torres, J. Casares, F. Jiménez-Ibarra +4
We present time-resolved 10.4-m GTC and 4.2-m WHT intermediate resolution spectroscopy of the X-ray transient MAXI J1820+070 (=ASASSN-18ey) obtained during its decline to the quies…
Discovery and analysis of a ULX nebula in NGC 3521
K. M. López, P. G. Jonker, M. Heida +5
We present Very Large Telescope/X-shooter and Chandra X-ray observatory/ACIS observations of the ULX [SST2011] J110545.62+000016.2 in the galaxy NGC 3521. The source identified as…
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…