Results 21 to 30 of about 142,027 (204)
Event Rate of Fast Radio Bursts from Binary Neutron Star Mergers
The Astrophysical Journal, 2023 It is proposed that a one-off fast radio burst (FRB) with periodic structure may be produced during the inspiral phase of a binary neutron star (BNS) merger. In this paper, we study the event rate of such kind of FRB.
Zhi-Lin Chen +3 more
doaj +1 more source
Spectral Index of the Filaments in the Abell 523 Radio Halo
Galaxies, 2021 The galaxy cluster Abell 523 hosts a radio halo characterized by the presence of two filaments transversely located with respect to the cluster merger axis.
Valentina Vacca +7 more
doaj +1 more source
Galaxy Mergers and Interactions at High Redshift [PDF]
, 2006 In this review we discuss the evidence for galaxy interactions and mergers in the distant universe and the role of mergers in forming galaxies. Observations show that the fraction of massive (M> M_*) galaxies involved in major mergers is roughly 5-10% at z~1.
arxiv +1 more source
Evidence for non-merger co-evolution of galaxies and their supermassive black holes [PDF]
, 2022 Recent observational and theoretical studies have suggested that supermassive black holes (SMBHs) grow mostly through non-merger (`secular') processes. Since galaxy mergers lead to dynamical bulge growth, the only way to observationally isolate non-merger growth is to study galaxies with low bulge-to-total mass ratio (e.g. B/T < 10%).
arxiv +1 more source
Spatially Offset Active Galactic Nuclei III: Discovery of Late-Stage Galaxy Mergers with The Hubble Space Telescope [PDF]
, 2018 Galaxy pairs with separations of only a few kpc represent important stages in the merger-driven growth of supermassive black holes (SMBHs). However, such mergers are difficult to identify observationally due to the correspondingly small angular scales.
arxiv +1 more source
Interacting galaxies in the IllustrisTNG simulations -- IV: Enhanced Supermassive Black Hole Accretion Rates in Post-Merger Galaxies [PDF]
, 2022 We present an analysis of the instantaneous supermassive black hole (SMBH) accretion rates in a collection of 1563 post-merger galaxies drawn from the IllustrisTNG simulation. Our sample consists of galaxies that have experienced a merger in the last simulation snapshot (within ~160 Myrs of coalescence) in the redshift range 0
arxiv +1 more source
Could M31 be the result of a major merger?
EPJ Web of Conferences, 2012 We investigated a scenario in which M31 could be the remnant of a gas-rich major merger. Galaxy merger simulations, highly constrained by observations, were run using GADGET 2 in order to reproduce M31. We succeeded in reproducing the global shape of M31,
Puech M. +5 more
doaj +1 more source
Method for Determining AGN Accretion Phase in Field Galaxies [PDF]
, 2016 Recent observations of AGN activity in massive galaxies (log Mstar / Msun > 10.4) show that: 1) at z < 1, AGN-hosting galaxies do not show enhanced merger signatures compared to normal galaxies, 2) also at z < 1, most AGNs are hosted by quiescent galaxies; and 3) at z > 1, percentage of AGNs in star forming galaxies increases and becomes comparable to ...
arxiv +1 more source
Galaxy Merger Statistics and Inferred Bulge-to-Disk Ratios in Cosmological SPH Simulations [PDF]
Astrophys.J.647:763-772,2006, 2005 We construct merger trees for galaxies identified in a cosmological hydrodynamical simulation and use them to characterize predicted merger rates as a function of redshift, galaxy mass, and merger mass ratio. At z=0.3, we find a mean rate of 0.054 mergers per galaxy per Gyr above a 1:2 mass ratio threshold for massive galaxies (baryonic mass above 6 ...
arxiv +1 more source
Weak-lensing Mass Bias in Merging Galaxy Clusters
The Astrophysical Journal, 2023 Although weak lensing (WL) is a powerful method to estimate a galaxy cluster mass without any dynamical assumptions, a model bias can arise when the cluster density profile departs from the assumed model profile. In a merging system, the bias is expected
Wonki Lee +8 more
doaj +1 more source