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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/33069
DC FieldValueLanguage
dc.contributor.authorNISINI, Brunellaen_US
dc.contributor.authorBENEDETTINI, Milenaen_US
dc.contributor.authorGIANNINI, Teresaen_US
dc.contributor.authorCaux, E.en_US
dc.contributor.authorDI GIORGIO, Anna Mariaen_US
dc.contributor.authorLiseau, R.en_US
dc.contributor.authorLorenzetti, D.en_US
dc.contributor.authorMOLINARI, Sergioen_US
dc.contributor.authorSaraceno, P.en_US
dc.contributor.authorSmith, H. A.en_US
dc.contributor.authorSPINOGLIO, Luigi Giuseppe Mariaen_US
dc.contributor.authorWhite, G. J.en_US
dc.date.accessioned2023-01-26T10:17:44Z-
dc.date.available2023-01-26T10:17:44Z-
dc.date.issued1999en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12386/33069-
dc.description.abstractThe spectrum of the Class 0 source L1448-mm has been measured over the wavelength range extending from 6 to 190 mu m with the Long Wavelength Spectrometer (LWS) and the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory (ISO). The far infrared spectrum is dominated by strong emission from gaseous H_2O and from CO transitions with rotational quantum numbers J >= 14; in addition, the H_2 pure rotational lines S(3), S(4) and S(5), the OH fundamental line at 119 mu m, as well as emission from [O I] 63 mu m and [C Ii] 158 mu m are also observed. The strong CO and water emission can be consistently explained as originating in a warm gas component at T ~ 700-1400 K and n_H_2 ~ (3-50) 10(4 ) cm(-3) , which fills about 0.2-2% of the ~ 75\arcsec LWS field of view (corresponding, assuming a single emitting region, to a physical size of about (3-12)\arcsec or (0.5-2) 10(-2) pc at d = 300 pc). We derive an H_2O/CO abundance ratio ~ 5, which, assuming a standard CO/H_2 abundance of 10(-4) , corresponds to H_2O/H_2 ~ 5 10(-4) . This value implies that water is enhanced by about a factor ~ 10(3) with respect to its expected abundance in the ambient gas. This is consistent with models of warm shocked regions which predict that most of the free atomic oxygen will be rapidly converted into water once the temperature of the post-shocked gas exceeds ~ 300 K. The relatively high density and compact size inferred for this emission may suggest an origin in the shocked region along the molecular jet traced by SiO and EHV CO millimeter line emission. Further support is given by the fact that the observed enhancement in H_2O can be explained by shock conditions similar to those expected to produce the abundant SiO observed in the region. L1448-mm shows the largest water abundance so far observed by ISO amongst young sources displaying outflow activity; we argue that the occurrence of multiple shocks over a relatively short interval of time, like that evidenced in the surroundings of L1448-mm, could have contributed to enrich the molecular jet with a high H_2O column density. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) with the participation of ISAS and NASAen_US
dc.language.isoengen_US
dc.titleStrong H_2O and high-J CO emission towards the Class 0 protostar L1448-mmen_US
dc.typeArticle-
dc.identifier.urlhttps://ui.adsabs.harvard.edu/abs/1999A%26A...350..529N/abstracten_US
dc.relation.mediumSTAMPAen_US
dc.relation.volume350en_US
dc.relation.firstpage529en_US
dc.type.refereeREF_1en_US
dc.description.numberofauthors12en_US
dc.description.internationalsìen_US
dc.contributor.countryITAen_US
dc.contributor.countryUSAen_US
dc.contributor.countryGBRen_US
dc.contributor.countryFRAen_US
dc.contributor.countrySWEen_US
dc.relation.scientificsectorFIS/05 - ASTRONOMIA E ASTROFISICAen_US
dc.relation.journalASTRONOMY & ASTROPHYSICSen_US
dc.type.miur262 Articolo in rivista-
dc.identifier.adsbibcode1999A&A...350..529Nen_US
dc.description.apcnoen_US
dc.description.oa1 – prodotto con file in versione Open Access (allegare il file al passo  5-Carica)en_US
item.grantfulltextopen-
item.languageiso639-1en-
item.fulltextWith Fulltext-
item.openairetypeArticle-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
crisitem.journal.journalissn0004-6361-
crisitem.journal.anceE016240-
crisitem.author.deptO.A. Roma-
crisitem.author.deptIAPS Roma-
crisitem.author.deptO.A. Roma-
crisitem.author.deptIAPS Roma-
crisitem.author.deptIAPS Roma-
crisitem.author.deptIAPS Roma-
crisitem.author.orcid0000-0002-9190-0113-
crisitem.author.orcid0000-0002-3597-7263-
crisitem.author.orcid0000-0002-7035-8513-
crisitem.author.orcid0000-0002-4767-2360-
crisitem.author.orcid0000-0002-9826-7525-
crisitem.author.orcid0000-0001-8840-1551-
Appears in Collections:1.01 Articoli in rivista
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