Results 31 to 40 of about 253,449 (279)
FASEB BioAdvances, Volume 4, Issue 12, Page 775-797, December 2022., 2022 Abstract During initial maternal recognition of pregnancy (MRP), the equine embryo displays a series of unique events characterized by rapid blastocyst expansion, secretion of a diverse array of molecules, and transuterine migration to interact with the uterine surface.
Alba Rudolf Vegas +6 more
wiley +1 more source
The Astrophysical Journal, 2023 1ES1927+654 is a nearby active galactic nucleus (AGN) that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of months to years.
Ritesh Ghosh +26 more
doaj +1 more source
Megamaser Disks in Active Galactic Nuclei [PDF]
, 1998 Recent spectroscopic and VLBI-imaging observations of bright extragalactic water maser sources have revealed that the megamaser emission often originates in thin circumnuclear disks near the centers of active galactic nuclei (AGNs).
Abraham Z. +21 more
core +4 more sources
Dust Emission from Active Galactic Nuclei [PDF]
, 2002 Unified schemes of active galactic nuclei (AGN) require an obscuring dusty torus around the central source, giving rise to Seyfert 1 line spectrum for pole-on viewing and Seyfert 2 characteristics in edge-on sources.
Antonucci R. +7 more
core +4 more sources
The Messy Nature of Fiber Spectra: Star–Quasar Pairs Masquerading as Dual Type 1 AGNs
The Astrophysical Journal, 2023 Theoretical studies predict that the most significant growth of supermassive black holes (SMBHs) occurs in late-stage mergers, coinciding with the manifestation of dual active galactic nuclei (AGNs), and both major and minor mergers are expected to be ...
Ryan W. Pfeifle +7 more
doaj +1 more source
Reionization with galaxies and active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT In this work we investigate the properties of the sources that reionized the intergalactic medium (IGM) in the high-redshift Universe. Using a semi-analytical model aimed at reproducing galaxies and black holes in the first ∼1.5 Gyr of the Universe, we revisit the relative role of star formation and black hole accretion in ...
Tirthankar Roy Choudhury +12 more
openaire +5 more sources
The role of AGN jets in the reionization epoch [PDF]
A&A 617, L3 (2018), 2018 The reionization of the Universe ends the dark ages that started after the recombination era. In the case of H, reionization finishes around $z\sim 6$. Faint star-forming galaxies are the best candidate sources of the H-ionizing radiation, although active galactic nuclei may have also contributed. We have explored whether the termination regions of the
arxiv +1 more source
Neutrino Conversions in Active Galactic Nuclei [PDF]
, 2000 I discuss the possibility of production of high energy cosmic neutrinos (E \geq 10^{6} GeV) in cores of active galactic nuclei and study some of the effects of neutrino mixing on their subsequent propagation. I also discuss the prospects for observations
Husain, Athar
core +3 more sources
JETTED ACTIVE GALACTIC NUCLEI [PDF]
International Journal of Modern Physics: Conference Series, 2012 Most of the electromagnetic output of blazars (BL Lac objects and Flat Spectrum Radio Quasars) comes out in the γ–ray band, making the Large Area Telescope [0.1–100 GeV] onboard the Fermi satellite and the Cherenkov telescopes crucial for gather crucial data and thus to understand their physics.
openaire +3 more sources
, 2013 Apresentação realizada como parte da avaliação da disciplina "Introdução a Astrofísica Extragaláctica" (2013)
+6 more sources