Results 61 to 70 of about 916 (166)
The Astrophysical JournalGravitational waves (GWs) from stellar binary black hole (sBBH) mergers can be strongly gravitational lensed by intervening galaxies/galaxy clusters. Only a few works have investigated cluster-lensed sBBH mergers by adopting oversimplified models, while ...
Zhiwei Chen +6 more
doaj +1 more source
Common-envelope evolution and stellar mergers
, 2016 We discuss the various phases encountered during common-envelope (CE) evolution, starting with the criterion for dynamical mass transfer and the onset of a common-envelope phase, the main spiralin phase and ending with the final merging of the binary components (in cases where the envelope is not ejected earlier).
openaire +2 more sources
The Origins of Gas Accreted by Supermassive Black Holes: The Importance of Recycled Gas
The Astrophysical JournalWe investigate the fueling mechanisms of supermassive black holes (SMBHs) by analyzing 10 zoom-in cosmological simulations of massive galaxies, with stellar masses 10 ^11–12 M _⊙ and SMBH masses 10 ^8.9–9.7 M _⊙ at z = 0, featuring various major and ...
Ena Choi +4 more
doaj +1 more source
The Astrophysical JournalRecent detections of gravitational waves from mergers of binary black holes (BBHs) with premerger source-frame individual masses in the so-called upper mass gap, expected due to (pulsational) pair instability supernovae ((P)PISNe), have created immense ...
Ambreesh Khurana, Sourav Chatterjee
doaj +1 more source
The Impact of Stellar Populations on the Dynamics of Merger Remnants
, 2009 Many studies and simulations suggest gas-rich mergers do not contribute significantly to the overall star-formation rate and total mass function of galaxies. The velocity dispersions (sigma) of Luminous & Ultraluminous Infrared Galaxies measured using the 1.62 or 2.29 micron CO bandheads imply they will form m < m* ellipticals.
Rothberg, B., Fischer, J.
openaire +2 more sources
The Age–Thickness Relation as a Tracer of the Merger History of Disk Galaxies
The Astrophysical JournalIn the hierarchical framework of galaxy formation, disk galaxies are shaped by a sequence of mergers and interactions, yet reconstructing this history from observations remains challenging.
Lekshmi Thulasidharan +4 more
doaj +1 more source
A magnetic massive star has experienced a stellar merger
ScienceMassive stars (those ≥8 solar masses at formation) have radiative envelopes that cannot sustain a dynamo, the mechanism that produces magnetic fields in lower-mass stars. Despite this, approximately 7% of massive stars have observed magnetic fields, the origin of which is debated.
Frost, A. J. +15 more
openaire +4 more sources
The Maximum Mass Ratio of Hierarchical Binary Black Hole Mergers May Cause the q–χeff Correlation
The Astrophysical Journal LettersRegardless of their initial spins, the merger of two roughly equal mass black holes (BHs) produces a remnant BH of dimensionless spin 0.69. Such remnants can merge with other BHs in dense stellar environments and produce hierarchical mergers.
Aditya Vijaykumar +2 more
doaj +1 more source
The Astrophysical JournalRecent studies show that the eccentricity distribution of wide binaries (semimajor axis ≳10 ^3 au) observed by Gaia tends to favor large eccentricities more strongly than the canonical thermal distribution ( P ( e ) ∝ e )—such distributions are termed ...
Yubo Su, Bin Liu, Siyao Xu
doaj +1 more source
Inferring Host-galaxy Properties of LIGO–Virgo–KAGRA’s Black Holes
The Astrophysical JournalObservations of gravitational waves from binary black hole (BBH) mergers have measured the redshift evolution of the BBH merger rate. The number density of galaxies in the Universe evolves differently with redshift based on their physical properties ...
Aditya Vijaykumar +3 more
doaj +1 more source