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pro vyhledávání: '"Zhu, Yucong"'
Autor:
Zhu, Yucong
An understanding of radiation is paramount for connecting observations of accretion disks with the theory of black holes. In this thesis, we explore via radiative transfer postprocessing calculations the observational signatures of black holes. We in
Externí odkaz:
http://nrs.harvard.edu/urn-3:HUL.InstRepos:17463143
We describe HEROIC, an upgraded version of the relativistic radiative post-processor code HERO described in a previous paper, but which now Includes Comptonization. HEROIC models Comptonization via the Kompaneets equation, using a quadratic approxima
Externí odkaz:
http://arxiv.org/abs/1510.04208
HERO (Hybrid Evaluator for Radiative Objects) is a 3D general relativistic radiative transfer code which has been tailored to the problem of analyzing radiation from simulations of relativistic accretion discs around black holes. HERO is designed to
Externí odkaz:
http://arxiv.org/abs/1505.04838
Autor:
Sadowski, Aleksander, Narayan, Ramesh, Tchekhovskoy, Alexander, Abarca, David, Zhu, Yucong, McKinney, Jonathan C.
We present a sub-grid model that emulates the magnetic dynamo operating in magnetized accretion disks. We have implemented this model in the general relativisic radiation magnetohydrodynamic (GRRMHD) code \koral, using results from local shearing she
Externí odkaz:
http://arxiv.org/abs/1407.4421
Akademický článek
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Black hole binaries exhibit a wide range of variability phenomena, from large-scale state changes to broadband noise and quasi-periodic oscillations, but the physical nature of much of this variability is poorly understood. We examine the variability
Externí odkaz:
http://arxiv.org/abs/1312.3333
Autor:
Ouellette, Nathalie N. Q., Courteau, Stéphane, Holtzman, Jon A., Dalcanton, Julianne J., McDonald, Michael, Zhu, Yucong
By virtue of its proximity, the Virgo Cluster is an ideal laboratory for testing our understanding structure formation in the Universe. In this spirit, we present a dynamical study Virgo galaxies as part of the Spectroscopic and H-band Imaging of Vir
Externí odkaz:
http://arxiv.org/abs/1310.7575
Autor:
Zhu, Yucong, Narayan, Ramesh
The standard thin accretion disc model predicts that discs around stellar mass black holes become radiation pressure dominated and thermally unstable once their luminosity exceeds L>0.02 L_Edd. Observationally, discs in the high/soft state of X-ray b
Externí odkaz:
http://arxiv.org/abs/1307.0012
A numerical scheme is described for including radiation in multi-dimensional general-relativistic conservative fluid dynamics codes. In this method, a covariant form of the M1 closure scheme is used to close the radiation moments, and the radiative s
Externí odkaz:
http://arxiv.org/abs/1212.5050
Autor:
Zhu, Yucong, Davis, Shane W., Narayan, Ramesh, Kulkarni, Akshay K., Penna, Robert F., McClintock, Jeffrey E.
It is generally thought that the light coming from the inner plunging region of black hole accretion discs contributes negligibly to the disc's overall spectrum, i.e. the plunging fluid is swallowed by the black hole before it has time to radiate. In
Externí odkaz:
http://arxiv.org/abs/1202.1530