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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 ...
Accretion disks around black holes in modified gravity
(EDP Sciences, 2013-03)
Context. Stellar-mass black holes offer what is perhaps the best scenario to test theories of gravity in the strong-field regime. In particular, f(R) theories, which have been widely discus in a cosmological context, can ...
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, UV, and optical observations of the accretion disk and boundary layer in the symbiotic star RT Crucis
(EDP Sciences, 2018-05)
Compared to mass transfer in cataclysmic variables, the nature of accretion in symbiotic binaries in which red giants transfer material to white dwarfs (WDs) has been difficult to uncover. The accretion flows in a symbiotic ...
ALMA CN Zeeman Observations of AS 209: Limits on Magnetic Field Strength and Magnetically Driven Accretion Rate
(IOP Publishing, 2021-02)
While magnetic fields likely play an important role in driving the evolution of protoplanetary disks through angular momentum transport, observational evidence of magnetic fields has only been found in a small number of ...
Dissecting a Disk-instability Outburst in a Symbiotic Star: NuSTAR and Swift Observations of T Coronae Borealis during the Rise to the "superactive" State
(IOP Publishing, 2019-08)
The current superactive state of the recurrent nova T Coronae Borealis (T CrB) has been observed with unprecedented detail. Previously published observations provide strong evidence that this state is due to an enhancement ...
High-energy signatures of binary systems of supermassive black holes
(EDP Sciences, 2016-04)
Context. Binary systems of supermassive black holes are expected to be strong sources of long gravitational waves prior to merging.These systems are good candidates to be observed with forthcoming space-borne detectors. ...
Magnetised accretion discs in Kerr spacetimes: II. Hot spots
(EDP Sciences, 2016-03)
Context. Quasi-periodic variability has been observed in a number of X-ray binaries that harbor black hole candidates. In general relativity, black holes are uniquely described by the Kerr metric and, according to the ...
Unveiling a cluster of protostellar disks around the massive protostar GGD 27 MM1
(EDP Sciences, 2019-03)
Context. Most stars form in clusters and thus it is important to characterize the protostellar disk population in dense environments to assess whether the environment plays a role in the subsequent evolution. Specifically, ...
The nature of transition circumstellar disks. III. Perseus, Taurus, and Auriga
(IOP Publishing, 2012-05)
As part of an ongoing program aiming to characterize a large number of Spitzer-selected transition disks (disks with reduced levels of near-IR and/or mid-IR excess emission), we have obtained (sub)millimeter wavelength ...