Results 31 to 40 of about 5,289 (173)
Identification of Bubble Nebulae around NGC 55 ULX-1 with MUSE Observations
The Astrophysical Journal, 2023 Using the Multi Unit Spectroscopic Explorer (MUSE) instrument on the Very Large Telescope, we identified three bubble nebulae (denoted as A, B, and C) around an ultraluminous X-ray source (ULX) in NGC 55.
Changxing Zhou, Hua Feng, Fuyan Bian
doaj +1 more source
Soft X-Ray Transients as Ultraluminous X-Ray Sources [PDF]
Publications of the Astronomical Society of Japan, 2004 Abstract We discuss the possibility that the soft X-ray transient GRS 1915$+$105 evolved from a binary similar to V4641 Sgr (XTE J1819$-$254) by conservative mass-transfer, and estimate the possible mass-transfer rates during the evolution.
Chang-Hwan Lee, Gerald E. Brown
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The Hunt for Pulsating Ultraluminous X-ray Sources [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 Abstract Motivated by the recent discoveries that six Ultraluminous X-ray Sources (ULXs) are powered by highly super-Eddington X-ray pulsars, we searched for additional pulsating ULX (PULX) candidates by identifying sources that exhibit long-term flux variability of at least an order of magnitude (a common feature seen in the 6 known ...
X Song +6 more
openaire +4 more sources
COMPACT OPTICAL COUNTERPARTS OF ULTRALUMINOUS X-RAY SOURCES [PDF]
The Astrophysical Journal, 2011 Using archival Hubble Space Telescope (HST) imaging data, we report the multiband photometric properties of 13 ultraluminous X-ray sources (ULXs) that have a unique compact optical counterpart. Both magnitude and color variation are detected at time scales of days to years.
Tao, Lian +3 more
openaire +2 more sources
The Astrophysical Journal, 2023 Despite the 30 yr history of ultraluminous X-ray sources (ULXs) studies, issues such as the majority of their physical natures (i.e., neutron stars, stellar-mass black holes, or intermediate black holes) as well as the accretion mechanisms are still ...
Chen-Hsun Ma +3 more
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Ultraluminous X‐ray sources: Three exciting years [PDF]
Astronomische Nachrichten, 2016 AbstractThe extreme extragalactic sources known as Ultraluminous X‐ray Sources (ULX) represent a unique testing environment for compact objects population studies and the accretion process. Their nature has long been disputed. Their luminosity, well above the Eddington luminosity for a stellar‐mass black hole, can imply the presence of an intermediate ...
openaire +2 more sources
The Astrophysical Journal, 2023 We have conducted long-slit spectroscopic observations and analyzed archival radio data for the ultraluminous X-ray source (ULX) NGC 4861 X-1. Our spectral line analysis unveils NGC 4861 X-1 as the fourth ULX situated within an X-ray photoionized nebula,
Hang Gong +7 more
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Intermediate Mass Black Holes: Their Motion and Associated Energetics
Advances in High Energy Physics, Volume 2014, Issue 1, 2014., 2014 There is a lot of current astrophysical evidence and interest in intermediate mass black holes (IMBH), ranging from a few hundred to several thousand solar masses. The active galaxy M82 and the globular cluster G1 in M31, for example, are known to host such objects.
C. Sivaram, Kenath Arun, Christian Corda
wiley +1 more source
Searching for coherent pulsations in ultraluminous X-ray sources [PDF]
, 2014 Luminosities of ultraluminous X-ray sources (ULXs) are uncomfortably large if compared to the Eddington limit for isotropic accretion onto stellar-mass object.
Doroshenko, V. +2 more
core +1 more source
Recoiling Black Holes: Electromagnetic Signatures, Candidates, and Astrophysical Implications
Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012 Supermassive black holes (SMBHs) may not always reside right at the centers of their host galaxies. This is a prediction of numerical relativity simulations, which imply that the newly formed single SMBH, after binary coalescence in a galaxy merger, can receive kick velocities up to several 1000 km/s due to anisotropic emission of gravitational waves ...
S. Komossa, Francesca Civano
wiley +1 more source