X-ray Variability from the Ultraluminous Black Hole Candidate X-ray Binary in the Globular Cluster RZ 2109 [PDF]
, 2018 We present the results of long-term monitoring of the X-ray emission from the ultraluminous X-ray source XMMUJ122939.9+075333 in the extragalactic globular cluster RZ2109. The combination of the high X-ray luminosity, short term X-ray variability, X-ray spectrum, and optical emission suggest that this system is likely an accreting black hole in a ...
arxiv +1 more source
The missing link between ultraluminous X-ray sources and metallicity [PDF]
arXiv, 2013 The nature of ultraluminous X-ray sources (ULXs) is still debated. Recent studies show that metal-poor massive stars can collapse into massive stellar black holes (MSBHs), that is black holes with mass > 25 Msun. Such MSBHs are sufficiently massive to explain most ULXs without requiring substantial violations of the Eddington limit.
arxiv
Possible Supercritical Accretion on the Ultraluminous X-Ray Source in the Metal-poor Galaxy I Zw 18
The Astrophysical JournalWe present an analysis of X-ray observations of the ultraluminous X-ray source (ULX) in I Zw 18 based on archival data taken with Chandra, XMM-Newton, and Suzaku. This ULX is considered to be an intermediate-mass black hole candidate simply because it is
Marina Yoshimoto +4 more
doaj +1 more source
ULX Collimation by Outflows in Moderately Magnetized Neutron Stars
The Astrophysical JournalWe perform radiative magnetohydrodynamics simulations in general relativity of super-Eddington disk accretion onto neutron stars endowed with a magnetic dipole corresponding to surface strengths not exceeding 100 Giga-Gauss.
Fatemeh Kayanikhoo +2 more
doaj +1 more source
Multiwavelength Observations of Ultraluminous X-Ray Sources [PDF]
arXiv, 2004 Multiwavelength observations may help us understand the physical nature of the ultraluminous X-ray sources (ULXs) found in external galaxies. Enabled by the arcsecond X-ray source positions now available from Chandra, there has been significant recent progress in the identification of optical and radio counterparts to ULXs.
arxiv
Observations of ultraluminous X-ray sources [PDF]
, 2011 Ultraluminous X-ray sources (ULXs), first observed ~30 years ago, have been argued as extreme stellar mass black hole binaries or a new class intermediate mass black hole. In order to settle this debate, scientists have utilised a wide range of telescopes, exploiting large sections of the electro-magnetic spectrum.
arxiv +1 more source
Search for Fast Radio Bursts and Radio Pulsars from Pulsing Ultraluminous X-Ray Sources
The Astrophysical JournalWe conducted targeted fast radio burst (FRB) and pulsar searches on eight pulsing ultraluminous X-ray sources (PULXs) using the Five-hundred-meter Aperture Spherical radio Telescope (FAST) and the Parkes 64 m Radio Telescope (Murriyang) to investigate ...
Juntao Bai +7 more
doaj +1 more source
A Deeper Look into eFEDS AGN Candidates in Dwarf Galaxies with Chandra
The Astrophysical JournalThe ability to accurately discern active massive black holes (BHs) in nearby dwarf galaxies is paramount to understanding the origins and processes of “seed” BHs in the early Universe.
Adonis A. Sanchez +3 more
doaj +1 more source
Variable Magellanic HMXB Sources versus Variable ULX Sources: Nothing to Brag about the ULX Sources
Galaxies, 2020 We carry out a meta-analysis of ultraluminous X-ray (ULX) sources that show large variabilities (by factors of >10) between their highest and lowest emission states in the X-ray energy range of 0.3–10 keV.
Dimitris M. Christodoulou +5 more
doaj +1 more source
An Alternative Model for the Orbital Decay of M82 X-2: The Anomalous Magnetic Braking of a Bp Star
The Astrophysical JournalRecently, the first pulsating ultraluminous X-ray source M82 X-2 was reported to be experiencing a rapid orbital decay at a rate of $\dot{P}=-(5.69\pm 0.24)\times {10}^{-8}\,{\rm{s}}\,{{\rm{s}}}^{-1}$ based on 7 yr NuSTAR data.
Wen-Cong Chen
doaj +1 more source