Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Shahram Abbassi"'
Autor:
Razieh Ranjbar, Shahram Abbassi
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 117 (2023)
Observational evidence and many numerical simulations show the existence of winds (i.e., uncollimated outflows) in the accretion systems of elliptical galaxy centers. One of the primary aims of this study is to investigate the solutions of slowly rot
Externí odkaz:
https://doaj.org/article/c0a00830ce7e44f28ddcbf1f959769f0
Autor:
Seyede Tahere Kashfi, Shahram Abbassi
Publikováno v:
Iranian Journal of Astronomy and Astrophysics, Vol 4, Iss 1, Pp 37-43 (2017)
Externí odkaz:
https://doaj.org/article/ccc777dd8e844716a96d7f7401a14e0b
Autor:
Narjes Shahamat, Shahram Abbassi
Publikováno v:
The Fifteenth Marcel Grossmann Meeting.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d0a1b8c404dbe167701d292d2a39b69
https://doi.org/10.1142/9789811258251_0036
https://doi.org/10.1142/9789811258251_0036
We study the global solutions of slowly rotating accretion flows around the supermassive black hole in the nucleus of an elliptical galaxy. The velocity of accreted gas surrounding the black hole is initially subsonic and then falls onto the black ho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c71ade0dd47c7eede6844b81c4409bdf
The present work proposes a new formalism for the inner regions of a neutrino-dominated accretion flows (NDAFs) by considering the self-gravity, where the neutrino opacity is high enough to make neutrinos trapped becoming a dominant factor in the tra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c94c4a1b8b7710d9c1973753994fdf30
http://arxiv.org/abs/2110.06580
http://arxiv.org/abs/2110.06580
The main purpose of this paper is to obtain analytical solutions for radiative transfer equations related to the vertical structure of accretion discs with finite optical depth. In the non-gray atmosphere, we employ the optical-depth dependent Edding
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4eaadfb6e5e50ead105fc3b582180c17
http://arxiv.org/abs/2006.03802
http://arxiv.org/abs/2006.03802
The evolution of disk galaxies in modified gravity is studied by using high-resolution N-body simulations. More specifically, we use the weak field limit of two modified gravity theories, i.e., nonlocal gravity (NLG) and scalar-tensor-vector gravity
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40df6332879dbd8fa733c360c693cbf1
Autor:
Narjes Shahamat, Shahram Abbassi
X-ray flares can be accounted for a hint to the late time activity of Gamma-ray bursts (GRBs) central engines. Such a long term activity has been described through some models, one of which is the viscous evolution of the outer disc fragments that pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0dbbecffc158a9c0f8f7455e60778f09
http://arxiv.org/abs/1911.12094
http://arxiv.org/abs/1911.12094
The classical Bondi model is adopted to study accretion onto the finite luminous region around the central massive black hole (MBH) in an elliptical galaxy. Unlike Bondi (1952), we define the boundary conditions at a certain finite radius ($r_f$) ins
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d7beea4fc1e77acc2714b5eace56c7f6
Autor:
Shahram Abbassi, Asiyeh Habibi
We study the local thermal stability of thin accretion disks. We present a full stability analysis in the presence of a magnetic field and more importantly wind. For wind, we use a general model suitable for adequately describing several kinds of win
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a06c3b1ce065f4f96c088df58e6e452e