Results 71 to 80 of about 916 (166)

Seeds to success: Growing heavy black holes in dense star clusters

Astronomy & Astrophysics
Context. The observational dearth of black holes (BHs) with masses between ∼100 and 100 000 M⊙ raises questions about the nature of intermediate-mass black holes (IMBHs).
Paiella Lavinia, Sedda Manuel Arca, Mestichelli Benedetta, Ugolini Cristiano   +3 more
doaj   +1 more source

Portrait of a Galaxy on FIRE: Exploring α-bimodality as a consequence of inside-out disc growth in a hierarchical formation scenario

Astronomy & Astrophysics
Context. The chemical dichotomy in the [α/Fe]-[Fe/H] plane, such as the one observed in the stellar Milky Way disc, is a consequence of the complex processes underlying the formation and evolution of disc galaxies. Aims.
Benito María, Aavik Annaliina, Battaglia Giuseppina, Cardona-Barrero Salvador, Evestus Ele-Liis, Fernández-Alvar Emma, Põder Sven, Ramler Heleri, Deshev Boris, Tempel Elmo   +9 more
doaj   +1 more source

Probing Binary Black Hole Formation Channels through Cosmic Large-scale Structure

The Astrophysical Journal Letters
The growing number of binary black hole mergers detected through gravitational waves offers unprecedented insight into their underlying population, yet their astrophysical formation channels remain unresolved.
William J. Smith, Krystal Ruiz-Rocha, Kelly Holley-Bockelmann, Michela Mapelli, Karan Jani   +4 more
doaj   +1 more source

Size–Mass Relation Shows Its Colours: Contrasting Physical Imprints of Galaxy Evolution in Rest-Frame UV and Optical

Galaxies
The galaxy size–mass relation (SMR) is a key scaling relation used to constrain the physical processes that build galaxy structure, yet it is almost always measured in a single rest-frame optical band, where the light traces the bulk of the old stellar ...
Angelo George, Marcin Sawicki, Ivana Damjanov   +2 more
doaj   +1 more source

Azimuthal Misalignments in Stellar Warp Structure as Dynamical Tracers of Mergers in Milky Way–like Galaxies

The Astrophysical Journal Letters
We investigate the origin of warps in stellar disks using high-resolution Milky Way analogs from the IllustrisTNG50 simulation. Focusing on galaxies that experienced a major merger, we identify a characteristic azimuthal misalignment between the warp ...
Lekshmi Thulasidharan, Elena D’Onghia, Robert Benjamin   +2 more
doaj   +1 more source

How to Escape from a Trap: Outcomes of Repeated Black Hole Mergers in Active Galactic Nuclei

The Astrophysical Journal Letters
Stellar-mass black holes (BHs) embedded in active galactic nuclei (AGN) may be major sources of astrophysical gravitational waves (GWs), contributing both to the observed LIGO–Virgo–KAGRA population of binary BH mergers and to future populations of LISA ...
Shmuel Gilbaum, Evgeni Grishin, Nicholas C. Stone, Ilya Mandel   +3 more
doaj   +1 more source

Where Have All the Little Red Dots Gone? Supermassive Black Hole Binary Dynamics and Its Impact on Galaxy Properties

The Astrophysical Journal Letters
Recent James Webb Space Telescope observations have revealed a peculiar class of galaxies at redshifts z  ≳ 6, characterized by extremely high central stellar densities and overmassive central supermassive black holes (SMBHs), “little red dots” (LRDs). A
Fazeel Mahmood Khan, Benjamin L. Davis, Andrea Valerio Macciò, Kelly Holley-Bockelmann   +3 more
doaj   +1 more source

Asymmetries in stellar streams induced by a galactic merger

Astronomy & Astrophysics
Stellar streams are sensitive to perturbations from, for example, giant molecular clouds, bars and spiral arms, infalling dwarf galaxies, or globular clusters which can imprint gaps, clumps, spurs, and asymmetries in tails. In addition to these effects, the impact of a major galactic merger on a population of stellar streams ...
Guillaume, Claire, Renaud, Florent, Martin, Nicolas, Famaey, Benoit, Di Matteo, Paola, Thomas, Guillaume, Ferrone, Salvatore, Ibata, Rodrigo, Pagnini, Giulia   +8 more
openaire   +2 more sources

The neighboring stars of N6946-BH1 and the observational characteristics of failed supernovae

The Open Journal of Astrophysics
Stellar collapse models predict that some stars more massive than $\sim$15$M_\odot$ may collapse directly to a black hole, sometimes with a weak optical transient, a phenomenon known as a failed supernova.
Raquel Forés-Toribio, C. S. Kochanek
doaj   +1 more source

A Study of the Merging Dwarf Galaxy VCC322

The Astrophysical Journal
Galaxy interactions and mergers can enhance or reduce star formation, but a complete understanding of the involved processes is still lacking. The effect of dwarf galaxy mergers is even less clear than their massive counterpart.
Lan-Yue Zhang, Yinghe Zhao, Hong-Xin Zhang   +2 more
doaj   +1 more source