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dc.contributor.authorDickey, J.M.
dc.contributor.authorBrinks, E.
dc.date.accessioned2012-03-20T17:00:42Z
dc.date.available2012-03-20T17:00:42Z
dc.date.issued1988-08-01
dc.identifier.citationDickey , J M & Brinks , E 1988 , ' An H I absorption line survey of Messier 31 ' , Monthly Notices of the Royal Astronomical Society , vol. 233 , pp. 781-790 .
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 652392
dc.identifier.otherPURE UUID: 524e01af-413e-462a-827e-6390c2836311
dc.identifier.otherBibtex: urn:0f3abe004ac76846a0518fbb19de3e69
dc.identifier.otherORCID: /0000-0002-7758-9699/work/30407955
dc.identifier.urihttp://hdl.handle.net/2299/8008
dc.description.abstractThe 21-cm absorption through the disk of M31 has been observed, using the VLA to study the cool atomic phase of the interstellar medium in this nearby spiral galaxy. It is found that the abundance of diffuse clouds with tau between 0.125 and 1 in M31 is no higher than in the solar neighborhood of the Milky Way. The mean spin temperature, 300 K, is similar to or higher than the local value. The fraction of the neutral atomic hydrogen in the cool phase is about 0.25 or less. These results imply that M31 has a mixture of warm and cool interstellar phases similar to that in our vicinity of the Milky Way, which suggests either that the heating and cooling balance occurs in a similar pressure environment, or that whatever dynamical processes determine the mixture of warm and cool gas reach a similar equilibrium in M31 as here. Specifically, the warm neutral medium seems to be a robust phase, with a much larger filling-factor than the cool clouds.en
dc.format.extent10
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectABSORPTION SPECTRA, INTERSTELLAR MATTER, LINE SPECTRA, SOLAR NEIGHBORHOOD, SPIRAL GALAXIES, VERY LARGE ARRAY (VLA), HYDROGEN ATOMS, INTERSTELLAR GAS, MILKY WAY GALAXY, NEUTRAL GASES
dc.titleAn H I absorption line survey of Messier 31en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstyperestrictedAccess


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