Results 141 to 150 of about 9,171,233 (161)
Ultraluminous X-ray sources are beamed
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT We show that magnetar models for ultraluminous X-ray sources (ULXs) have serious internal inconsistencies. The magnetic fields required to increase the limiting luminosity for radiation pressure above the observed (assumed isotropic) luminosities are completely incompatible with the spin-up rates observed for pulsing ULXs.
Andrew King, Jean-Pierre Lasota
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From ultraluminous X-ray sources to ultraluminous supersoft sources: NGC 55 ULX, the missing link [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 In recent work with high-resolution reflection grating spectrometers (RGS) aboard $\textit{XMM–Newton}$, Pinto et al. have discovered that two bright and archetypal ultraluminous X-ray sources (ULXs) have strong relativistic winds in agreement with ...
Dominic Walton +2 more
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OPTICAL COUNTERPARTS OF THE NEAREST ULTRALUMINOUS X-RAY SOURCES [PDF]
Astrophysical Journal, Supplement Series, 2013 ApJS in press. 51 pages; 13 pages of text followed by colour figures and tables. Figure quality reduced to satisfy arXiv regulations, for high quality figure, contact j.c.gladstone@ualberta.ca or download accepted version from ApJS when ...
Andrew Levan +2 more
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The Time-variable Ultraluminous X-Ray Sources of “The Antennae”
Astrophysical Journal, 2003 We report the first results of the Chandra temporal monitoring of the ultraluminous X-ray sources (ULXs) in the Antennae galaxies (NGC 4038/4039). Observations at four different epochs, covering timescales of 2 yr to 2 months, show variability in seven ...
Andreas Zezas
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SPECTRAL STATES AND EVOLUTION OF ULTRALUMINOUS X-RAY SOURCES [PDF]
Astrophysical Journal, 2009 We examined spectral evolution in ultraluminous X-ray sources (ULXs) with apparent luminosities of about 10^40 ergs/s. Based on new results in this paper and those reported in the literature, two common spectral behaviors were found. Some ULXs in starburst galaxies have varying luminosity (L) but remain in the hard state with power-law spectra and a ...
Hua Feng, Philip Kaaret
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X-Ray Binaries and Ultraluminous X-Ray Sources
Proceedings of the International Workshop on Quark Phase Transition in Compact Objects and Multimessenger Astronomy: Neutrino Signals, Supernovae and Gamma-Ray Bursts., 2016final_author
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On the nature of ultraluminous X-ray sources
Uspekhi Fizicheskih Nauk, 2019Abstract Ultraluminous X-ray sources (ULXs) that are located in external galaxies exhibit X-ray luminosities exceeding those of the brightest black holes in the Milky Way and the Local Group galaxies by hundreds or even thousands of times.
S N Fabrika, K E Atapin, A S Vinokurov
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The demographics of ultraluminous X‐ray sources
Astronomische Nachrichten, 2011AbstractResults of recent statistical studies of the population of ultraluminous X‐ray sources are presented. Special emphasis is placed on the outcome of a complete survey of 140 nearby galaxies hosting 114 ULXs. It is shown that ULXs are preferentially associated with young star‐forming regions but not necessarily with massive young clusters, that ...
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Ultraluminous X-ray sources with the SKA
2015The discovery almost three decades ago of non-nuclear, point-like X-ray sources with X-ray luminosities LX ≥ 3 × 1039 erg s−1 revolutionized the physics of black hole accretion. If of stellar origin, such Ultraluminous X-ray sources (ULXs) would have to accrete at super-Eddington rates in order to reach the observed high X-ray luminosities ...
Mezcua, Mar +6 more
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Population Synthesis of Ultraluminous X-ray Sources with Magnetized Neutron Stars
Astronomy Letters, 2021Konstantin Postnov, A G Kuranov
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