Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2400
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dc.contributor.authorBalasubramanyam, R.-
dc.contributor.authorBronfman, L.-
dc.contributor.authorDeguchi, Shuji-
dc.date.accessioned2007-05-25T08:04:32Z-
dc.date.available2007-05-25T08:04:32Z-
dc.date.issued1997-06-
dc.identifier.citationPublications of the Astronomical Society of Japan, 1997, Vol.49, p307-314en
dc.identifier.issn0004-6264-
dc.identifier.urihttp://hdl.handle.net/2289/2400-
dc.descriptionOpen Access.en
dc.description.abstractSelf-absorbed profiles has been seen towards the core containing IRAS 18507+0121, a probable high-mass protostar, in the millimeter wave lines of HCO(+) , H(13) CO(+) , CS, and C(34) S. Especially, the J=1->0 line of H(13) CO(+) is found to be stronger than that of HCO(+) . We have modeled this core in order to determine the physical conditions in it. To generate synthetic spectra from the model core, we used a multi-level, non-LTE radiative transfer code that employs a large-velocity-gradient approximation in order to estimate the level populations. It has been demonstrated that the line profiles can be explained by a collapsing hot core hidden behind a cold ( ~ 4 K) and dense (3 times 10(4) cm(-3) ) intervening, but comoving, screen or envelope. The model parameters adjusted to reproduce the observed profiles are (a) the temperature, density, and velocity fields in the model core and (b) the temperature, density, and linewidth in the screen. Comparing the observed profiles with the model spectra at both the on-center and one off-center positions, we have been able to reliably determine the physical conditions in the core.en
dc.format.extent1186533 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherAstronomical Society of Japanen
dc.relation.urihttp://adsabs.harvard.edu/cgi-bin/bib_query?1997PASJ...49..307Ren
dc.rights1997 Astronomical Society of Japanen
dc.subjectINTERSTELLAR: CLOUDSen
dc.subjectNTERSTELLAR: MOLECULESen
dc.subjectLINE FORMATIONen
dc.subjectNEBULAE: INDIVIDUAL (IRAS 18507+0121)en
dc.titleEvidence for a dense, cold screen towards IRAS 18507+0121en
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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