Results 11 to 20 of about 46,211 (288)
Stellar mergers as the origin of magnetic massive stars [PDF]
Nature, 2019 About ten per cent of 'massive' stars (those of more than 1.5 solar masses) have strong, large-scale surface magnetic fields1-3. It has been suggested that merging of main-sequence and pre-main-sequence stars could produce such strong fields4,5, and the predicted fraction of merged massive stars is also about ten per cent6,7.
Schneider, F. +6 more
openaire +8 more sources
Violent stellar merger model for transient events [PDF]
Monthly Notices of the Royal Astronomical Society, 2006 We derive the constraints on the mass ratio for a binary system to merge in a violent process. We find that the secondary to primary stellar mass ratio should be ~0.003 < (M_2/M_1) < ~0.15. A more massive secondary star will keep the primary stellar envelope in synchronized rotation with the orbital motion until merger occurs. This implies a very
Soker, Noam, Tylenda, Romuald
openaire +2 more sources
How do galaxies acquire their mass? [PDF]
, 2011 We introduce a toy model that describes (in a single equation) the mass in stars as a function of halo mass and redshift. Our model includes the suppression of gas accretion from gravitational shock heating and AGN jets mainly for M_halo > M_shock ~ 10 ...
Cattaneo, A. +3 more
core +11 more sources
Antitruncated Stellar Disks via Minor Mergers [PDF]
The Astrophysical Journal, 2007 We use hydrodynamic simulations of minor mergers of galaxies to investigate the nature of surface brightness excesses at large radii observed in some spiral galaxies: antitruncated stellar disks. We find that this process can produce the antitruncation via two competing effects: (1) merger-driven gas inflows that concentrate mass in the center of the ...
Younger, Joshua D. +3 more
openaire +3 more sources
Impact of Galaxy Mergers on Stellar Population Profiles of Early-type Galaxies
The Astrophysical Journal, 2023 We study the impact of galaxy mergers on stellar population profiles/gradients of early-type galaxies (ETGs) using ETGs at z < 0.055 in the Stripe 82 region of the Sloan Digital Sky Survey and MaNGA integral field unit spectroscopic data.
Yongmin Yoon, Jongwan Ko, Jae-Woo Kim
doaj +1 more source
The connection between mass, environment and slow rotation in simulated galaxies [PDF]
, 2018 Recent observations from integral field spectroscopy (IFS) indicate that the fraction of galaxies that are slow rotators, $F_{\rm SR}$, depends primarily on stellar mass, with no significant dependence on environment.
Bahe, Yannick +7 more
core +3 more sources
Dynamics of stellar disc tilting from satellite mergers
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT The Milky Way’s stellar disc can tilt in response to torques that result from infalling satellite galaxies and their associated tidal debris. In this work, we explore the dynamics of disc tilting by running N-body simulations of mergers in an isolated, isotropic Milky Way-like host galaxy, varying over satellite virial mass ...
Benjamin C Dodge +3 more
openaire +2 more sources
Magnetic massive stars from stellar mergers
Proceedings of the International Astronomical Union, 2022 AbstractThe first magnetic field in a star other than the Sun was detected in 1947 in the star 78 Vir. Today, we know that about 10% of these intermediate-mass and high-mass stars have strong, large-scale surface magnetic fields whose origin has remained a mystery till today.
Fabian R. N. Schneider +6 more
openaire +1 more source
Dancing to ChaNGa: A Self-Consistent Prediction For Close SMBH Pair Formation Timescales Following Galaxy Mergers [PDF]
, 2018 We present the first self-consistent prediction for the distribution of formation timescales for close Supermassive Black Hole (SMBH) pairs following galaxy mergers.
Governato, Fabio +4 more
core +3 more sources
The importance of major mergers in the build up of stellar mass in brightest cluster galaxies at z=1 [PDF]
, 2013 Recent independent results from numerical simulations and observations have shown that brightest cluster galaxies (BCGs) have increased their stellar mass by a factor of almost two between z~0.9 and z~0.2.
Barrientos, L. F. +24 more
core +5 more sources