Results 121 to 130 of about 195 (150)
Supermassive black-hole growth over cosmic time: active galaxy demography, physics, and ecology from Chandra surveys. [PDF]
Proc Natl Acad Sci U S A, 2010 Brandt WN, Alexander DM.
europepmc +1 more source
Molecular tracers of radiative feedback in Orion (OMC-1) Widespread CH<sup>+</sup> (<i>J</i> = 1-0), CO (10-9), HCN (6-5), and HCO<sup>+</sup> (6-5) emission. [PDF]
Astron Astrophys, 2019 Goicoechea JR +6 more
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Relativistic dynamics and extreme mass ratio inspirals. [PDF]
Living Rev Relativ, 2018 Amaro-Seoane P.
europepmc +1 more source
Maximally rotating supermassive stars at the onset of collapse: the perturbative effects of gas pressure, magnetic fields, dark matter, and dark energy. [PDF]
Mon Not R Astron Soc, 2018 Butler SP +3 more
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New Astronomy Reviews, 2023 A preprint as close as possible to the open access article at: https://www.sciencedirect.com/science/article/pii/S1387647322000306?via ...
Andrew KING, Jean-Pierre Lasota
exaly +5 more sources
Ultraluminous X-Ray Sources [PDF]
Annual Review of Astronomy and Astrophysics, 2017 We review observations of ultraluminous X-ray sources (ULXs). X-ray spectroscopic and timing studies of ULXs suggest a new accretion state distinct from those seen in Galactic stellar-mass black hole binaries. The detection of coherent pulsations indicates the presence of neutron-star accretors in three ULXs and therefore apparently super-Eddington ...
Hua Feng +2 more
exaly +6 more sources
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
exaly +7 more sources
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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