File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Temperature fluctuations in H II regions: T 2 for the two-phase model

TitleTemperature fluctuations in H II regions: T 2 for the two-phase model
Authors
KeywordsISM: general
ISM: H II regions
Issue Date2007
PublisherE D P Sciences. The Journal's web site is located at http://www.aanda.org
Citation
Astronomy And Astrophysics, 2007, v. 464 n. 2, p. 631-634 How to Cite?
AbstractAims. We investigate temperature fluctuations in H II regions in terms of a two-phase model, which assumes that the nebular gas consists of a hot and a cold phase. Methods. We derive general formulae for T([O III]), the [O III] forbidden line temperature, and T(H I), the hydrogen Balmer jump temperature, in terms of the temperatures of the hot and cold phases, T h and T c. Results. For large temperature differences, the values of t 2 required to account for the observed difference between T([O III]) and T(H I) are much lower than those deduced using the classical formulae that assume random and small amplitude temperature fluctuations. One should therefore be cautious when using a two-phase model to account for empirically derived t 2 values. We present a correction of a recent work by Giammanco & Beckman, who use a two-phase model to estimate the ionization rate of H II regions by cosmic rays. We show that a very small amount of cold gas is sufficient to account for t 2 values typically inferred for H II regions. © ESO 2007.
Persistent Identifierhttp://hdl.handle.net/10722/45267
ISSN
2014 Impact Factor: 4.378
2015 SCImago Journal Rankings: 2.446
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Yen_HK
dc.contributor.authorErcolano, Ben_HK
dc.contributor.authorLiu, XWen_HK
dc.date.accessioned2007-10-30T06:21:22Z-
dc.date.available2007-10-30T06:21:22Z-
dc.date.issued2007en_HK
dc.identifier.citationAstronomy And Astrophysics, 2007, v. 464 n. 2, p. 631-634en_HK
dc.identifier.issn0004-6361en_HK
dc.identifier.urihttp://hdl.handle.net/10722/45267-
dc.description.abstractAims. We investigate temperature fluctuations in H II regions in terms of a two-phase model, which assumes that the nebular gas consists of a hot and a cold phase. Methods. We derive general formulae for T([O III]), the [O III] forbidden line temperature, and T(H I), the hydrogen Balmer jump temperature, in terms of the temperatures of the hot and cold phases, T h and T c. Results. For large temperature differences, the values of t 2 required to account for the observed difference between T([O III]) and T(H I) are much lower than those deduced using the classical formulae that assume random and small amplitude temperature fluctuations. One should therefore be cautious when using a two-phase model to account for empirically derived t 2 values. We present a correction of a recent work by Giammanco & Beckman, who use a two-phase model to estimate the ionization rate of H II regions by cosmic rays. We show that a very small amount of cold gas is sufficient to account for t 2 values typically inferred for H II regions. © ESO 2007.en_HK
dc.format.extent112866 bytes-
dc.format.extent410859 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.languageengen_HK
dc.languagefreen_HK
dc.languagegeren_HK
dc.publisherE D P Sciences. The Journal's web site is located at http://www.aanda.orgen_HK
dc.relation.ispartofAstronomy and Astrophysicsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsAstronomy & Astrophysics. Copyright © E D P Sciences.en_HK
dc.rightsThe original publication is available at www.edpsciences.orgen_HK
dc.subjectISM: generalen_HK
dc.subjectISM: H II regionsen_HK
dc.titleTemperature fluctuations in H II regions: T 2 for the two-phase modelen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-6361&volume=464&issue=2&spage=631&epage=634&date=2007&atitle=Temperature+fluctuations+in+H+II+regions:+t2+for+the+two-phase+modelen_HK
dc.identifier.emailZhang, Y: zhangy96@hku.hken_HK
dc.identifier.authorityZhang, Y=rp00841en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1051/0004-6361:20066564en_HK
dc.identifier.scopuseid_2-s2.0-33947225677en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33947225677&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume464en_HK
dc.identifier.issue2en_HK
dc.identifier.spage631en_HK
dc.identifier.epage634en_HK
dc.identifier.isiWOS:000244679500028-
dc.publisher.placeFranceen_HK
dc.identifier.scopusauthoridZhang, Y=23768446500en_HK
dc.identifier.scopusauthoridErcolano, B=7801345025en_HK
dc.identifier.scopusauthoridLiu, XW=7409287288en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats