Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers
Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto +9 more
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Chemical Evolution of the Universe and its Consequences for Gravitational‐Wave Astrophysics
Annalen der Physik, Volume 536, Issue 2, February 2024.Population properties of double compact object mergers (especially binary black holes) are sensitive to the metallicity dependent cosmic star formation history. The uncertainty of this quantity cannot be ignored and makes the interpretation of current gravitational wave observations difficult.
Martyna Chruślińska
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A Study of Spectral Variability Between Flaring and Nonflaring State in M74 X-1
The Astrophysical JournalWe conducted an extensive long-term spectral and timing study of the ultraluminous X-ray (ULX) source M74 X-1, using data taken between 2001 and 2021 by Chandra and XMM-Newton X-ray observatories.
Aman Upadhyay +2 more
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Seeking for the Leading Actor on the Cosmic Stage: Galaxies versus Supermassive Black Holes
, 2012 Advances in Astronomy, Volume 2012, Issue 1, 2012.
Angela Bongiorno +4 more
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Photoionization of the Composite Nebula Surrounding NGC 5408 X-1: Implications for Beamed Emission
The Astrophysical JournalNGC 5408 X-1 is a well-studied ultraluminous X-ray source (ULX) and is surrounded by a photoionized nebula. Previous optical spectroscopy established strong Balmer, [O iii ], and He ii λ 4686 emission from the nebula, but the powering engine remains ...
Jing Guo +6 more
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Discovery of a 9.67 s Pulsar in an Ultraluminous X-Ray Source in NGC 4631 with XMM-Newton
The Astrophysical Journal LettersThanks to a recent observation with XMM-Newton, we discovered periodic pulsations at P = 9.6652 ± 0.0002 s in a new ultraluminous X-ray source (ULX) in the galaxy NGC 4631. This source, dubbed as X−8, shows one of the largest spin-up rates ever observed,
Lorenzo Ducci +6 more
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Magnetic Inclination Evolution of Accreting Neutron Stars in Intermediate/Low-mass X-Ray Binaries
The Astrophysical Journal, 2023 The magnetic inclination angle χ , namely the angle between the spin and magnetic axes of a neutron star, plays a vital role in its observational characteristics. However, there are few systematic investigations of its long-term evolution, especially for
Hao-ran Yang, Xiang-dong Li
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The Astrophysical JournalSupercritical accretion onto compact objects is expected to drive optically thick winds, resulting in observed X-ray emission as a function of viewing angle.
Xiaohong Tang, Hua Feng
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Flux Variations and Torque Reversals of Cen X-3
The Astrophysical JournalCen X-3 is an archetypical X-ray pulsar with strong flux variations and alternating torque reversals, both of which are similar to those of recently discovered pulsating ultraluminous X-ray sources.
Jiren Liu
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How Beaming Shapes the Demographics of Ultraluminous X-Ray Sources
The Astrophysical JournalUltraluminous X-ray sources (ULXs) are off-nuclear compact objects with apparent luminosities above 10 ^39 erg s ^−1 , often exceeding the Eddington limit for stellar-mass black holes.
Ying-Han Mao, Xiang-Dong Li
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