Balmer decrement - 版本历史

2021年11月29日 (一) 02:02 Shen

2021-11-29T02:02:51Z

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	*HII region: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3 (Brocklehurst 1971).		*[[HII region]]: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3 (Brocklehurst 1971).
	:Halpha: Hbeta: Hgamma = 2.8:1.0:0.47 for temperatures near 10^4 °K		:Halpha: Hbeta: Hgamma = 2.8:1.0:0.47 for temperatures near 10^4 °K

2018年8月2日 (四) 04:43 Shen

2018-08-02T04:43:17Z

←上一版本		2018年8月2日 (四) 04:43的版本
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	*HII region: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3		*HII region: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3 (Brocklehurst 1971).
			:Halpha: Hbeta: Hgamma = 2.8:1.0:0.47 for temperatures near 10^4 °K
	(Brocklehurst 1971).

	*In AGNs, however, the harder photoionizing spectrum results in a large transition zone, or partly ionized region, in which H° coexists with H		*In AGNs, however, the harder photoionizing spectrum results in a large transition zone, or partly ionized region, in which H° coexists with H

Shen：创建页面，内容为“HII region: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3 (Brocklehurst 1971). In AGNs, however, the harder photoionizing sp...”

2017-04-09T13:32:32Z

创建页面，内容为“*HII region: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3 (Brocklehurst 1971). *In AGNs, however, the harder photoionizing sp...”

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*HII region: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3
(Brocklehurst 1971).

*In AGNs, however, the harder photoionizing spectrum results in a large transition zone, or partly ionized region, in which H° coexists with H
+ and free electrons. In this zone collisional excitation is also important in addition to recombination collisional excitation (Ferland and
Netzer 1983; Halpem and Steiner 1983). The main effect of collisional excitation is to enhance Ha. The higher Balmer
lines are less affected because of their larger excitation energies and smaller excitation cross sections.(Veilleux & Osterbrock (1987).
:*Ha/Hb = 3.1 (Ferland and Netzer 1983, Péquignot 1984, Gaskell 1984; Gaskell and Ferland 1984).

Balmer decrement - 版本历史

2021年11月29日 (一) 02:02 Shen

2018年8月2日 (四) 04:43 Shen

Shen：​创建页面，内容为“*HII region: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3 (Brocklehurst 1971). *In AGNs, however, the harder photoionizing sp...”

Shen：创建页面，内容为“HII region: case B Balmer recombination decrement Ha/Hb = 2.85 for T = 10^4 K and Ne=10^4 cm-3 (Brocklehurst 1971). In AGNs, however, the harder photoionizing sp...”