Results 61 to 70 of about 139,790 (125)
Evidence for a Redshifted Excess in the Intracluster Light Fractions of Merging Clusters at z ∼ 0.8
The Astrophysical Journal LettersThe intracluster light (ICL) fraction is a well-known indicator of the dynamical activity in intermediate-redshift clusters. Merging clusters in the redshift interval 0.18 < z < 0.56 have a distinctive peak in the ICL fractions measured between ∼3800 and
Yolanda Jiménez-Teja +3 more
doaj +1 more source
Classifying merger stages with adaptive deep learning and cosmological hydrodynamical simulations [PDF]
arXivHierarchical merging of galaxies plays an important role in galaxy formation and evolution. Mergers could trigger key evolutionary phases such as starburst activities and active accretion periods onto supermassive black holes at the centres of galaxies.
arxiv
A Dual Active Black Hole Candidate with Mass Ratio ~7:1 in a Disk Galaxy
The Astrophysical Journal LettersDual active galactic nuclei (AGNs) with comparable masses are commonly witnessed among the major merged galaxies with interaction remnants. Considering almost every massive galaxy is associated with multiple dwarf satellites around it, minor mergers ...
Xiao Cao +10 more
doaj +1 more source
Invisible Major Mergers: Why the Definition of a Galaxy Merger Ratio Matters [PDF]
arXiv, 2009 The mapping between dark matter halo mass, galaxy stellar mass, and galaxy cold gas mass is not a simple linear relation, but is influenced by a wide array of galaxy formation processes. We implement observationally-normalized relations between dark matter halo mass, stellar mass, and cold gas mass to explore these mappings, with specific emphasis on ...
arxiv
Distribution of Hα Emitters in Merging Galaxy Clusters
The Astronomical JournalStudies of star formation in various galaxy cluster mergers have reached apparently contradictory conclusions regarding whether mergers stimulate star formation, quench it, or have no effect.
David Wittman +3 more
doaj +1 more source
Evolution of the galaxy merger rate in model universes [PDF]
arXiv, 2008 We investigate the evolution of the galaxy merger rate predicted by two semi-analytical galaxy formation models implemented on the Millennium Simulation of dark matter structure growth. The fraction of merging galaxy pairs at each time-step of the simulation is derived from the galaxy catalogues obtained by the models and the results are compared with ...
arxiv
Anisotropic Velocity Fluctuations in Galaxy Mergers: A Probe of the Magnetic Field
The Astrophysical JournalMagnetic fields and turbulence are fundamental to the evolutions of galaxies, yet their precise measurement and analysis present significant challenges.
Yue Hu +5 more
doaj +1 more source
The Astrophysical JournalThe merger timescales of isolated low-mass pairs (10 ^8 < M _* < 5 × 10 ^9 M _⊙ ) on cosmologically motivated orbits have not yet been studied in detail, though isolated high-mass pairs (5 × 10 ^9 < M _* < 10 ^11 M _⊙ ) have been studied extensively.
Katie Chamberlain +4 more
doaj +1 more source
Where to Search for Supermassive Binary Black Holes
UniverseSupermassive binary black holes (SMBBHs) are the anticipated byproducts of galaxy mergers and play a pivotal role in shaping galaxy evolution, gravitational wave emissions, and accretion physics. Despite their theoretical prevalence, direct observational
Paola Marziani +3 more
doaj +1 more source
The Astrophysical Journal Supplement SeriesWe used the Condor Array Telescope to obtain deep imaging observations through the luminance broadband and He ii 468.6 nm, [O iii ] 500.7 nm, He i 587.5 nm, H α , [N ii ] 658.4 nm, and [S ii ] 671.6 nm narrowband filters of an extended region comprising ...
Kenneth M. Lanzetta +5 more
doaj +1 more source