| Project/Area Number |
15540293
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
|---|
| Research Institution | Josai Junior College |
|---|
Principal Investigator |
NOZAWA Satoshi Josai Junior College, professor, その他, 教授 (00258914)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ITOH Naoki Sophia University, Physics Department, professor, 理工学部, 教授 (20103939)
|
|---|
| Project Period (FY) |
2003 – 2005
|
| Project Status |
Completed (Fiscal Year 2005)
|
| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
|
|---|
| Keywords | galaxy clusters / plasmas / thermal bremsstrahlung / gaunt factor / relativistic corrections / Sunyaev-Zeldovich effect / CMB radiation / 熱制動輻射過程 / Gaunt因子 |
|---|
| Research Abstract |
We have studied the following two subjects for the high-temperature plasmas in the galaxy clusters.
(1)Sunyaev-Zeldovich effect for clusters of galaxies
The cosmic microwave background (CMB) radiation spectrum is distorted by the Compton scattering of the electrons in the clusters of galaxies. This effect is called as the thermal Sunyaev-Zeldovich (SZ) effect. In the present study we have extended the previous study on this subject. In 2003 we have derived an analytic expression for the thermal SZ effect which is applicable to extremely hot plasmas of galaxy clusters. In 2003 we have also extended the SZ effect by including the effect of the motion of the observer (earth). Both of the results were published in the refereed journals (Astronomy & Astrophysics).
(2)Thermal bremsstrahlung for the intracluster plasma
The thermal bremsstrahlung processes of the electons by ions and/or electrons in the intracluster plasmas are the main processes for producing the X-rays. In the present study we have performed the detailed calculations for the processes including the relativistic corrections. In particular, we have calculated the electron-electron bremsstrahlung processes including the relativistic corrections.
|
