Issue |
A&A
Volume 437, Number 1, July I 2005
|
|
---|---|---|
Page(s) | L11 - L14 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200500129 | |
Published online | 10 June 2005 |
Letter to the Editor
Temperature fluctuations in H II regions: Ionization by cosmic rays as a key mechanism
1
Instituto de Astrofísica de Canarias, C. vía Láctea s/n, 38200, La Laguna, Tenerife, Spain e-mail: corrado@ll.iac.es
2
Consejo Superior de Investigaciones Científicas, Spain
Received:
1
April
2005
Accepted:
18
May
2005
We present a detailed model capable of explaining quantitatively the temperature fluctuations observed in luminous, large regions.
The model is based on two assumptions which we justify on the basis
of observations: that the major fraction of the hydrogen in the clouds that form the
regions is not photoionized and is essentially
, this
is lightly ionized by fluxes of low energy cosmic rays (CR) produced by processes originating in the hot stars which illuminate the
regions.
Key words: ISM: general / ISM: HII regions / ISM: clouds / ISM: photon escape / elementary particles / methods: analytical / methods: data analysis
© ESO, 2005
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