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Mostrando ítems 11-20 de 2363
The widest Hα survey of accreting protoplanets around nearby transition disks
(EDP Sciences, 2020)
Structural overprint of a late Paleozoic accretionary system in north-central Chile (34°-35°S) during post-accretional deformation
(Servicio Nacional de Geología y Minería (SERNAGEOMIN), 2009)
Radiation from hot accretion flows onto black holes
(Asociación Argentina de Astronomía, 2019-08)
The hot accretion flows upon black holes are usually optically thin two-temperature plasmas in which electrons can achieve temperatures up to , producing radiation via synchrotron, bremsstrahlung and inverse Compton, and ...
ON THE DOUBLE NATURED SOLUTIONS OF THE TWO-TEMPERATURE EXTERNAL SOFT PHOTON COMPTONIZED ACCRETION DISKS
(IOP PUBLISHING LTD, 2009)
We have analyzed pair production in the innermost region of a two-temperature external soft photon Comptonized accretion disk. We have shown that, if the viscosity parameter is greater than a critical value alpha(c), the ...
A New Look at Quasar Accretion Disks
(International Astronomical Union, 2013)
The physics of active black holes (BHs) is governed by three key parameters: their mass, spin, and accretion rate. Understanding the cosmic evolution of these parameters is crucial for tracing back the growth of the BHs ...
Accretion from debris disks onto white dwarfs. Fingering (thermohaline) instability and derived accretion rates
(Edp Sciences, 2013-09)
Context. Recent observations of a large number of DA and DB white dwarfs show evidence of debris disks, which are the remnants of old planetary systems. The infrared excess detected with Spitzer and the lines of heavy ...
Nonthermal processes in hot accretion flows onto supermassive black holes: an inhomogeneous model
(EDP Sciences, 2021-05)
Context. Many low-redshift active galactic nuclei harbor a supermassive black hole accreting matter at low or medium rates. At such rates, the accretion flow usually consists of a cold optically thick disk, plus a hot, low ...
X-Ray Determination of the Variable Rate of Mass Accretion onto TW Hydrae
(IOP Publishing, 2012-11-05)
Diagnostics of electron temperature (Te), electron density (ne), and hydrogen column density (NH) from the Chandra High Energy Transmission Grating spectrum of He-like Ne ix in TW Hydrae (TW Hya), in conjunction with a ...