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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. |
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:*The warm neutral medium (WNM) has typical temperatures of ∼ 10000 K |
:*The warm neutral medium (WNM) has typical temperatures of ∼ 10000 K |
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:*he cold neutral medium (CNM) has typical temperatures < 300 K (20-50%) |
:*he cold neutral medium (CNM) has typical temperatures < 300 K (20-50%) |
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:*The WNM is mostly detected in emission and the CNM in absorption. |
:*The WNM is mostly detected in emission and the CNM in absorption. |
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:*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]] |
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==optical depth== |
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==Spin temperature== |
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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