Zobrazeno 1 - 10
of 177
pro vyhledávání: '"Ken, Ohsuga"'
We investigate the Hoyle-Lyttleton accretion of dusty-gas for the case where the central source is the black hole accretion disk. By solving the equation of motion taking into account the radiation force which is attenuated by the dust absorption, we
Externí odkaz:
http://arxiv.org/abs/2106.12866
Autor:
Rohta Takahashi, Masayuki Umemura, Ken Ohsuga, Yuta Asahina, Rintaro Takeda, Mikiya M. Takahashi, Norita Kawanaka, Kohkichi Konno, Tomoaki Nagasawa
Publikováno v:
The Astrophysical Journal Letters, Vol 967, Iss 1, p L10 (2024)
We have discovered analytical expressions for the probability density function (PDF) of photons that are multiply scattered in relativistic flows, under the assumption of isotropic and inelastic scattering. These expressions characterize the collecti
Externí odkaz:
https://doaj.org/article/c6ce85923d1b43a1848bc58235b5980d
Autor:
Matteo Bachetti, Matthew J. Middleton, Ciro Pinto, Andrés Gúrpide, Dominic J. Walton, Murray Brightman, Bret Lehmer, Timothy P. Roberts, Georgios Vasilopoulos, Jason Alford, Roberta Amato, Elena Ambrosi, Lixin Dai, Hannah P. Earnshaw, Hamza El Byad, Javier A. García, Gian Luca Israel, Amruta Jaodand, Kristin Madsen, Chandreyee Maitra, Shifra Mandel, Kaya Mori, Fabio Pintore, Ken Ohsuga, Maura Pilia, Daniel Stern, George Younes, Anna Wolter
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2023)
Introduction: Ultraluminous X-ray sources (ULXs) represent an extreme class of accreting compact objects: from the identification of some of the accretors as neutron stars to the detection of powerful winds travelling at 0.1–0.2 c, the increasing e
Externí odkaz:
https://doaj.org/article/8a30718b913d4e20b3ce8ab2b4efeaa2
Autor:
Yuta Asahina, Ken Ohsuga
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 1, p 45 (2024)
We perform a three-dimensional general relativistic radiation magnetohydrodynamics simulation of a tilted super-Eddington accretion disk around a spinning black hole (BH). The disk, which tilts and twists as it approaches the BH, precesses while main
Externí odkaz:
https://doaj.org/article/90967f2d914945529e4dbc3bf7fccddc
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 22 (2024)
By performing general-relativistic radiative transfer calculations, we show the radio images of relativistic jets including highly magnetized regions inside jet funnels, based on steady, axisymmetric, and semianalytic general-relativistic magnetohydr
Externí odkaz:
https://doaj.org/article/2d92e1405fbe4169a4e01bc860aed2c3
Autor:
Taichi Igarashi, Hiroyuki R. Takahashi, Tomohisa Kawashima, Ken Ohsuga, Yosuke Matsumoto, Ryoji Matsumoto
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 2, p 121 (2024)
Strong soft X-ray emission called soft X-ray excess is often observed in luminous active galactic nuclei (AGN). It has been suggested that the soft X-rays are emitted from a warm ( T = 10 ^6 ∼ 10 ^7 K) region that is optically thick for the Thomson
Externí odkaz:
https://doaj.org/article/de23d71abb0542e4aad68286f49a9d30
Autor:
Shogo B. Kobayashi, Hirofumi Noda, Teruaki Enoto, Tomohisa Kawashima, Akihiro Inoue, Ken Ohsuga
Publikováno v:
The Astrophysical Journal, Vol 955, Iss 2, p 124 (2023)
A phase-resolved analysis on the X-ray spectrum of ultraluminous X-ray pulsar (ULXP) NGC 300 ULX-1 is performed with data taken with XMM-Newton and NuSTAR on 2016 December 16. In addition to the classical phase-restricting analysis, a method develope
Externí odkaz:
https://doaj.org/article/7c52aed408424204880e0fb5c415e905
Publikováno v:
The Astrophysical Journal, Vol 952, Iss 1, p 62 (2023)
We perform general relativistic radiation magnetohydrodynamics simulations of super-Eddington accretion flows around a neutron star with a dipole magnetic field for modeling the Galactic ultraluminous X-ray source exhibiting X-ray pulsations, Swift J
Externí odkaz:
https://doaj.org/article/b9ab56328902491c8e321ee910d1c602
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 2, p 101 (2023)
We present a general relativistic radiative transfer code RAIKOU (来光) for multiwavlength studies of spectra and images including the black hole shadows around Kerr black holes. Important radiative processes in hot plasmas around black holes, i.e.
Externí odkaz:
https://doaj.org/article/a9510e8b7b144434b4318a4b2f3cab36
Autor:
Yuh Tsunetoe, Shin Mineshige, Tomohisa Kawashima, Ken Ohsuga, Kazunori Akiyama, Hiroyuki R. Takahashi
Publikováno v:
Galaxies, Vol 10, Iss 5, p 103 (2022)
Here, we demonstrate that polarization properties show a wide diversity depending on viewing angles. To simulate images of a supermassive black hole and surrounding plasma, we performed a full-polarimetric general relativistic radiative transfer base
Externí odkaz:
https://doaj.org/article/f78c87c1264b48de9963a06938850c62