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*the neutral hydrogen (H i) in the interstellar medium (ISM) is in two phases - a warm and a cold phase.
*the neutral hydrogen (H i) in the interstellar medium (ISM) is in two phases - a warm and a cold phase.
:*The warm neutral medium (WNM) has typical temperatures of ∼ 10000 K
:*The warm neutral medium (WNM) has typical temperatures of ∼ 10000 K
:*he cold neutral medium (CNM) has typical temperatures < 300 K (20-50%)
:*he cold neutral medium (CNM) has typical temperatures < 300 K (20-50%)
:*The WNM is mostly detected in emission and the CNM in absorption.
:*The WNM is mostly detected in emission and the CNM in absorption.
:*H i self-absorption (HISA) clouds are unique places where we can study the structure and the physical properties of the CNM at the same time.(mixed with H2[[分子氢]]

==optical depth==

==Spin temperature==

2018年5月28日 (一) 02:52的最新版本

  • the neutral hydrogen (H i) in the interstellar medium (ISM) is in two phases - a warm and a cold phase.
  • The warm neutral medium (WNM) has typical temperatures of ∼ 10000 K
  • he cold neutral medium (CNM) has typical temperatures < 300 K (20-50%)
  • The WNM is mostly detected in emission and the CNM in absorption.
  • H i self-absorption (HISA) clouds are unique places where we can study the structure and the physical properties of the CNM at the same time.(mixed with H2分子氢

optical depth

Spin temperature