Component thermalization time-scale estimate for the advection dominated accretion flow around Sgr A∗
✍ Scribed by David Tsiklauri
- Book ID
- 104426402
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 75 KB
- Volume
- 6
- Category
- Article
- ISSN
- 1384-1076
No coin nor oath required. For personal study only.
✦ Synopsis
We report here on a calculation of thermalization time-scale of the two temperature advection dominated accretion flow (ADAF) model. It is established that time required to equalize the electron and ion temperatures via electron-ion collisions in the ADAF with plausible physical parameters greatly exceeds the accretion time, which corroborates validity one of the crucial assumptions of the ADAF model, namely the existence of a hot two temperature plasma. This work is motivated by the recent success of the ADAF model [Nature 394 (1998) 651; MNRAS 304 (1999) 501] in explaining the emitted spectrum of Sgr A*, and it is complementary to the similar analysis of Mahadevan and Quataert [ApJ 490 (1997) 605].