Results 101 to 110 of about 5,289 (173)

No periodicity revealed for an "eclipsing" ultraluminous supersoft X-ray source in M81

, 2008
Luminous supersoft X-ray sources found in the Milky Way and Magellanic Clouds are likely white dwarfs that steadily or cyclically burn accreted matter on their surface, which are promising type Ia supernova progenitors.
Dworetsky M., Ji‐Feng Liu, Mitsuda K., Reinsch K.   +3 more
core   +1 more source

ULX Collimation by Outflows in Moderately Magnetized Neutron Stars

The Astrophysical Journal
We 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, Włodek Kluźniak, Miljenko Čemeljić   +2 more
doaj   +1 more source

Optical Counterparts of Ultraluminous X-Ray Sources

, 2002
Despite much observational and theoretical effort little is presently known about the nature of the luminous non-nuclear X-ray sources which appear to largely surpass the Eddington limit of a few solar masses. Here we present first results of our OHP/ESO/
Mirioni, Laurent, Pakull, Manfred W.
core   +2 more sources

New insights into ultraluminous X-ray sources from deep XMM-Newton observations

, 2005
The controversy over whether ultraluminous X-ray sources (ULXs) contain a new intermediate-mass class of black holes (IMBHs) remains unresolved. We present new analyses of the deepest XMM-Newton observations of ULXs that address their underlying nature ...
Goad, M. R., Reeves, J. N., Roberts, T. P., Stobbart, A. -M., Uttley, P., Warwick, R. S., Wilms, J.   +6 more
core   +2 more sources

Massive Pulsars and Ultraluminous X-ray Sources

, 2015
The detection of 1.37$\, $s pulsations from NuSTAR J095551+6940.8 implies the existence of an accreting pulsar, which challenges the conventional understanding of ultraluminous X-ray source. This kind of sources are proposed to be massive pulsars in this paper.
Guo, Yanjun, Tong, Hao, Xu, Renxin
openaire   +2 more sources

Explainable Machine Learning Classification of Chandra X-Ray Sources: SHAP Analysis of Multiwavelength Features

The Astrophysical Journal
Extensive astronomical surveys, like those conducted with the Chandra X-ray Observatory, detect hundreds of thousands of unidentified cosmic sources. Machine learning (ML) methods offer an efficient, probabilistic approach to classifying them, which can ...
Shivam Kumaran, Samir Mandal, Sudip Bhattacharyya   +2 more
doaj   +1 more source

A Deeper Look into eFEDS AGN Candidates in Dwarf Galaxies with Chandra

The Astrophysical Journal
The 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, Amy E. Reines, Ákos Bogdán, Ralph P. Kraft   +3 more
doaj   +1 more source

Isomer-specific kinetics of the C⁺ + H₂O reaction at the temperature of interstellar clouds. [PDF]

Sci Adv, 2021
Yang T, Li A, Chen GK, Yao Q, Suits AG, Guo H, Hudson ER, Campbell WC.   +7 more
europepmc   +1 more source

Search for Fast Radio Bursts and Radio Pulsars from Pulsing Ultraluminous X-Ray Sources

The Astrophysical Journal
We 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, Na Wang, Rui Luo, Wei-Yang Wang, Shi Dai, Songbo Zhang, Shiqian Zhao, Shuangqiang Wang   +7 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 Journal
Recently, 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