Tag: Astrophysical Phenomena and Observations
NuSTAR sees a hard X-ray state after MAXI J1752–457 superburst
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in AstrophysicsWhat the study found MAXI J1752–457 was observed with NuSTAR after a superburst, and the source was confirmed to match the previously seen Einstein Probe source EP240809a. The hard X-ray emission was consistent with a spherical blackbody component plus a steep nonthermal power-law component. Why the authors say this matters The authors conclude that the…
Nearby black holes fall into three imaging frequency classes
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in AstrophysicsWhat the study found Nearby supermassive black hole accretion flows can be grouped into three classes based on whether they become transparent at traditional imaging frequencies, require higher frequencies, or are unlikely to be transparent down to the black hole shadow in the submillimeter band. Why the authors say this matters The study suggests these…
Subgrid dynamo model reproduces magnetic field cycles in thin disks
What the study found A subgrid model of a helical large-scale dynamo with dynamical quenching was derived and implemented in general-relativistic resistive magnetohydrodynamic simulations of geometrically thin accretion disks. The model reproduced butterfly diagrams seen in earlier simulations and, in some cases, produced weak collimated polar outflows. Why the authors say this matters The authors…
Changing-look AGNs appear to be typical host-galaxy systems
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in AstrophysicsWhat the study found The study found that changing-look active galactic nuclei, or CL-AGNs, in this sample generally look like ordinary AGN host systems rather than a separate class. Their black holes roughly follow the same scaling relations seen in inactive galaxies, and their host-galaxy properties do not appear different from those of type 2…
Turbulent black hole coronae can produce observed X-ray spectra
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in AstrophysicsSimulations show turbulent black hole coronae generate two-temperature plasmas with extended nonthermal ion distributions while producing observed X-ray spectra.
Lorentz violation changes black hole disk images and polarization
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in AstrophysicsObservable signatures of Lorentz violation in Hořava gravity revealed through black hole accretion disk images and polarization patterns, testable with future Event Horizon Telescope observations.
Black hole merger spins peak near perpendicular
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in AstrophysicsAnalysis of gravitational-wave data reveals that merging black holes predominantly exhibit near-perpendicular spin orientations, suggesting most form in triple-star systems.
Magnetic charge changes orbits and waveforms near regular black holes
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in AstrophysicsStudy explores how magnetic charge in regular black holes alters gravitational waveforms from periodic orbits, offering new constraints on black hole properties through gravitational wave.
Supermassive stars may match JWST little red dot spectra
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in AstrophysicsSupermassive star models reproduce spectral signatures of JWST little red dots, suggesting these compact sources may be progenitors of the first supermassive black holes.
