Construction of Hybrid Model for Astrophysical Jets
| Project/Area Number |
15540235
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Osaka Kyoiku University |
|---|
Principal Investigator |
FUKUE Jun Osaka Kyoiku University, Faculty of Education, Professor, 教育学部, 教授 (80173326)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
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|---|
| Keywords | astrophysical jets / accretion disks / black holes / X-ray binary / active galactic nuclei / microquasar SS433 / relativistic astrophysics / radiation hydrodynamics |
|---|
| Research Abstract |
FY2003
We constructed a steady jet model emanating from a geometrically thin disk, taking into account the gas, radiation, and magnetic pressures. We have found that the jet flow generally have multiple critical (transonic) points, since the gravitational and radiative forces along the streamline do not monotonic.
As a result, the jet flow is accelerated by passing through the saddle type critical point to be supersonic.
We also obtained an approximate empirical formula for the terminal speed of jet flows.
FY2004
We examined on-axis jets of supercritical accretion disks, where the mass-accretion rate highly exceeds the Eddington accretion rate. The jet gas suffers from the gravity of the central object, the radiative flux from the disk, and the radiation drag force of the intense radiation fields of the disk.
We have calculated the equilibrium speed as well as the terminal one for on-axis jets.
We also found a useful expression between the terminal speed and the disk luminosity.
FY2005
We carefully examined the relativistic radiative flow from a luminous disk under a fully special relativistic treatment. The flow is assumed to be vertical, and the gravity, the gas pressure, and the viscous heating are ignored. The radiatively-driven flow in a luminous disk is numerically solved, from the flow base (disk "inside") to the flow top. For a given optical depth and appropriate initial conditions at the flow base, where the flow starts, a loaded mass in the flow is obtained as an eigenvalue of the boundary condition at the flow top. Moreover, the flow velocity and radiation fields along the flow are obtained as a function of the optical depth.
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Report
(4 results)
Research Products
(54 results)
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[Book] 最新天文小辞典2004
Author(s)
福江 純
Total Pages
446
Publisher
東京書籍
Description
「研究成果報告書概要(和文)」より
Related Report
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