Results 1 to 10 of about 76,004 (221)
Light Nuclei and Isotope Abundances in Cosmic Rays. Results from AMS-01
, 2012 Observations of the chemical and isotopic composition of light cosmic-ray nuclei can be used to constrain the astrophysical models of cosmic-ray transport and interactions in the Galaxy.
Tomassetti, N.
core +1 more source
The ∞ Galaxy: A Candidate Direct-collapse Supermassive Black Hole between Two Massive, Ringed Nuclei
The Astrophysical Journal LettersWe report the discovery of an unusual z = 1.14 object, dubbed the ∞ galaxy, in JWST imaging of the COSMOS field. Its rest-frame near-IR light is dominated by two compact nuclei with stellar masses of ∼10 ^11 M _⊙ and a projected separation of 10 kpc ...
Pieter van Dokkum +5 more
doaj +1 more source
Tidal Perturbation and Active Galaxy Nuclei [PDF]
International Astronomical Union Colloquium, 2000 AbstractTheories of nuclear activity mechanisms in disk galaxies (such as Seyfert galaxies) range from intrinsic (e.g. bars) to external (tidal perturbation by passing companions). The Byrd et al. (1986, 1987) simulation survey determined the tidal perturbation necessary to induce nuclear activity.
Gene Byrd, Mauri Valtonen
openaire +1 more source
Galactic abundances as a relic neutrino detection scheme
, 2011 We propose to use the threshold-free process of neutrino capture on beta-decaying nuclei (NCB) using all available candidate nuclei in the Milky Way as target material in order to detect the presence of the Cosmic neutrino background. By integrating over
Hannestad, Steen +2 more
core +1 more source
Evidence for a Delayed Ultraviolet Counterpart to X-Ray Quasiperiodic Eruptions in Ansky
The Astrophysical Journal LettersX-ray quasiperiodic eruptions (QPEs) represent a novel population of extreme, repeating nuclear transients whose physical origins remain debated. A defining characteristic of QPEs has been their exclusive detection in the X-ray band, with a notable ...
Hengxiao Guo +17 more
doaj +1 more source
The Ubiquity and Dual Nature of Ultra Compact Dwarfs [PDF]
, 2011 We present the discovery of several Ultra Compact Dwarfs (UCDs) located in field/group environments. Examination of these objects, plus literature objects, confirms the existence of two distinct formation channels for UCDs.
Kannappan, Sheila J., Norris, Mark A.
core +3 more sources
Misaligned External Gas Acquisition Boosts Central Black Hole Activities
The Astrophysical JournalOne important question in active galactic nuclei (AGN) is how gas is brought down to the galaxy center. Both internal secular evolution (torque induced by nonaxisymmetric galactic structures such as bars) and external processes (e.g., mergers or ...
Yuren Zhou +8 more
doaj +1 more source
The Astrophysical Journal, 2023 By using direct N -body numerical simulations, we model the dynamical coevolution of two supermassive black holes (SMBHs) and the surrounding stars in merging galaxies. In order to investigate how different stellar components evolve during the merger, we
Shuo Li +5 more
doaj +1 more source
Compact Nuclei in Moderately Redshifted Galaxies [PDF]
The Astrophysical Journal, 1996 12 pages AASTeX manuscript, 3 separate Postscript figures, to be published in ApJ ...
Sarajedini, Vicki L. +3 more
openaire +2 more sources
The Star Formation Rate - Dense Gas Relation in the Nuclei of Nearby Galaxies
, 2008 We investigate the relationship between the star formation rate (SFR) and dense molecular gas mass in the nuclei of galaxies. To do this, we utilize the observed 850 micron luminosity as a proxy for the infrared luminosity and SFR, and correlate this ...
Bussmann +15 more
core +1 more source