Results 111 to 120 of about 76,004 (221)
The end of the galactic cosmic-ray energy spectrum - a phenomenological view
, 2005 Two structures in the all-particle energy spectrum of cosmic rays, the knee at 4 PeV and the second knee around 400 PeV are proposed to be explained by a phenomenological model, the poly gonato model, connecting direct and indirect measurements. Within
Hoerandel, Joerg R. +2 more
core +1 more source
The Astrophysical JournalMerger rate predictions of massive black hole (MBH) seeds from large-scale cosmological simulations differ widely, with recent studies highlighting the challenge of low-mass MBH seeds failing to reach the galactic center, a phenomenon known as the seed ...
Diptajyoti Mukherjee +4 more
doaj +1 more source
How relevant is the torus activity/geometry for the TeV gamma-rays emitted in the jet of M87 ? [PDF]
, 2003 Motivated by unification schemes of active galactic nuclei, we review evidence for the existence of a small-scale dust torus in M87, a Fanaroff-Riley Class I radio galaxy.
Donea, A. -C., Protheroe, R. J.
core +1 more source
Ultrahigh Energy Nuclei in the Galactic Magnetic Field
, 2010 Observations are consistent with a significant fraction of heavy nuclei in the cosmic ray flux above a few times 10^19 eV. Such nuclei can be deflected considerably in the Galactic magnetic field, with important implications for the search of their ...
A. Waelkens +27 more
core +3 more sources
A Physical Model for Co-evolution of QSOs and of their Spheroidal Hosts
, 2006 At variance with most semi-analytic models, in the Anti-hierarchical Baryon Collapse scenario (Granato et al. 2001, 2004) the main driver of the galaxy formation and evolution is not the merging sequence but are baryon processes. This approach emphasizes,
Cirasuolo, M. +7 more
core
The Cosmic Owl: Twin Active Collisional Ring Galaxies with Starburst Merging Front at z = 1.14
The Astrophysical JournalGalaxy mergers play a critical role in driving galaxy evolution, especially by transforming galaxy morphology, redistributing gas around galaxies, triggering active galactic nuclei (AGN), and stimulating star formation.
Mingyu Li +14 more
doaj +1 more source
The Astrophysical JournalDusty circumnuclear disks (CNDs) in luminous early-type galaxies (ETGs) show regular, dynamically cold molecular gas kinematics. For a growing number of ETGs, Atacama Large Millimeter/sub-millimeter Array (ALMA) CO imaging and detailed gas-dynamical ...
Jared R. Davidson +10 more
doaj +1 more source
Active Galactic Nuclei and Galaxy Formation
The Astrophysical Journal, 1997 It is proposed that early jet-induced activity around active galactic nuclei (AGNs) is responsible for triggering large-scale star formation in protogalaxies and results in the formation of giant ellipticals and spheroids in the universe. Specifically, Begelman & Cioffi's model for overpressured cocoons expanding into protogalactic environs yields size
openaire +1 more source
Modeling the JWST MIRI Counts, Insights into the Source Properties and Role of Dust-obscured AGNs
The Astrophysical JournalUnderstanding the coevolution of galaxies and active galactic nuclei (AGNs) requires accurate modeling of dust-obscured systems. Recent surveys using the Mid Infrared Instrument (MIRI) on board the James Webb Space Telescope (JWST) have uncovered a large
Edgar P. Vidal +10 more
doaj +1 more source