78 citations · 196 across the 9 of their papers we have counts for
10 papers
A Newly Identified Transient Ultraluminous X-ray Source in M31
Ferdinand, Murray Brightman, Jean-Marie Hameury +9
Ultraluminous X-ray sources (ULXs) are off-nuclear X-ray sources with luminosities exceeding the Eddington limit of typical stellar-mass compact objects. While most known ULXs are…
The Advanced X-ray Imaging Satellite (AXIS) Community Science Book
Michael Koss, Nafisa Aftab, Steven W. Allen +395
The AXIS Community Science Book represents the collective effort of 592 scientists worldwide to define the transformative science enabled by the Advanced X-ray Imaging Satellite (A…
Skipping a beat: discovery of persistent quasi-periodic oscillations associated with pulsed fraction drop of the spin signal in M51 ULX-7
Matteo Imbrogno, Sara Elisa Motta, Roberta Amato +24
The discovery of pulsations in (at least) six ultraluminous X-ray sources (ULXs) has shown that neutron stars can accrete at (highly) super-Eddington rates, challenging the standar…
Return to the forgotten ULX: a broadband NICER+NuSTAR study of NGC 4190 ULX-1
Hannah P Earnshaw, Matteo Bachetti, Murray Brightman +7
We observed the nearby and relatively understudied ultraluminous X-ray source (ULX) NGC 4190 ULX-1 jointly with NICER and NuSTAR to investigate its broadband spectrum, timing prope…
A NuSTAR and Swift View of the Hard State of MAXI J1813-095
Jiachen Jiang, Douglas J. K. Buisson, Thomas Dauser +9
We present an analysis of the NuSTAR and Swift spectra of the black hole candidate MAXI J1813-095 in a failed-transition outburst in 2018. The NuSTAR observations show evidence of…
A new candidate pulsating ULX in NGC 7793
Erwan Quintin, Natalie Webb, Andrés Gúrpide +2
We report here the discovery of NGC 7793 ULX-4, a new transient ultraluminous X-ray source (ULX) in NGC 7793, a spiral galaxy already well known for harbouring several ULXs. This n…
Breaking the limit: Super-Eddington accretion onto black holes and neutron stars
M. Brightman, M. Bachetti, H. P. Earnshaw +10
With the recent discoveries of massive and highly luminous quasars at high redshifts (; e.g. Mortlock et al. 2011), the question of how black holes (BHs) grow in the early…
Looking at A 0535+26 at low luminosities with NuSTAR
Ralf Ballhausen, Katja Pottschmidt, Felix Fürst +12
We report on two NuSTAR observations of the HMXB A 0535+26 taken toward the end of its normal 2015 outburst at very low keV luminosities of erg/s an…
Measuring A Truncated Disk in Aquila X-1
Ashley L. King, John A. Tomsick, Jon M. Miller +14
We present NuSTAR and Swift observations of the neutron star Aquila X-1 during the peak of its July 2014 outburst. The spectrum is soft with strong evidence for a broad Fe Kαline.…
The Broadband XMM-Newton and NuSTAR X-ray Spectra of Two Ultraluminous X-ray Sources in the Galaxy IC 342
Vikram Rana, Fiona A. Harrison, Matteo Bachetti +15
We present results for two Ultraluminous X-ray Sources (ULXs), IC 342 X-1 and IC 342 X-2, using two epochs of XMM-Newton and NuSTAR observations separated by 7 days. We obser…