Afficher la notice abrégée

WISH VI. Constraints on UV and X-ray irradiation from a survey of hydrides in low- to high-mass YSOs

hal.structure.identifierInstitute of Astronomy [ETH Zürich]
dc.contributor.authorBENZ, A. O.,
hal.structure.identifierMax-Planck-Institut für Extraterrestrische Physik [MPE]
dc.contributor.authorBRUDERER, S.,
hal.structure.identifierLeiden Observatory [Leiden]
dc.contributor.authorVAN DISHOECK, E. F.,
hal.structure.identifierInstitut Pierre Louis d'Epidémiologie et de Santé Publique [iPLESP]
dc.contributor.authorMELCHIOR, M.,
hal.structure.identifierInstitute of Astronomy [ETH Zürich]
dc.contributor.authorWAMPFLER, S. F.,
hal.structure.identifierSRON Netherlands Institute for Space Research [SRON]
dc.contributor.authorVAN DER TAK, F.,
hal.structure.identifierInstituto de Ciencia de Materiales de Madrid [ICMM]
dc.contributor.authorGOICOECHEA, J. R.,
dc.contributor.authorINDRIOLO, N.,
hal.structure.identifierBergen University College
dc.contributor.authorKRISTENSEN, L. E.,
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorLIS, D. C.,
dc.contributor.authorMOTTRAM, J. C.,
hal.structure.identifierDepartment of Astronomy University of Michigan
dc.contributor.authorBERGIN, E. A.,
dc.contributor.authorCASELLI, P.,
hal.structure.identifierFORMATION STELLAIRE 2016
dc.contributor.authorHERPIN, Fabrice
hal.structure.identifierforeign laboratories [FL]
dc.contributor.authorHOGERHEIJDE, M. R.,
hal.structure.identifierNatl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7 Canada
dc.contributor.authorJOHNSTONE, D.,
dc.contributor.authorLISEAU, R.,
hal.structure.identifierINAF - Osservatorio Astronomico di Roma [OAR]
dc.contributor.authorNISINI, B.,
hal.structure.identifierforeign laboratories [FL]
dc.contributor.authorTAFALLA, M.,
hal.structure.identifierPlant Breeding
dc.contributor.authorVISSER, R.,
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorWYROWSKI, F.,
dc.date.issued2016-03
dc.identifier.issn0004-6361
dc.description.abstractEnHydrides are simple compounds containing one or a few hydrogen atoms bonded to a heavier atom. They are fundamental precursor molecules in cosmic chemistry and many hydride ions have become observable in high quality for the first time thanks to the Herschel Space Observatory. Ionized hydrides, such as CH+ and OH+, and also HCO+ that affect the chemistry of molecules such as water, provide complementary information on irradiation by far UV (FUV) or X-rays and gas temperature. The targeted lines of CH+, OH+, H2O+, C+ and CH are detected mostly in blue-shifted absorption. H3O+ and SH+ are detected in emission and only toward some high-mass objects. The observed line parameters and correlations suggest two different origins, related to gas entrained by the outflows and to the circumstellar envelope. The column density ratios of CH+/OH+ are estimated from chemical slab models, assuming that the H2 density is given by the specific density model of each object at the beam radius. For the low-mass YSOs the observed ratio can be reproduced for an FUV flux of 2-400 times the ISRF at the location of the molecules. In two high-mass objects, the UV flux is 20-200 times the ISRF derived from absorption lines, and 300-600 ISRF using emission lines. If the FUV flux required for low-mass objects originates at the central protostar, a substantial FUV luminosity, up to 1.5 L_sun, is required. There is no molecular evidence for X-ray induced chemistry in the low-mass objects on the observed scales of a few 1000 AU. For high-mass regions, the FUV flux required to produce the observed molecular ratios is smaller than the unattenuated flux expected from the central object(s) at the Herschel beam radius. This is consistent with an FUV flux reduced by circumstellar extinction or by bloating of the protostar.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Solar and Stellar Astrophysics
dc.title.enWISH VI. Constraints on UV and X-ray irradiation from a survey of hydrides in low- to high-mass YSOs
dc.typeArticle de revue
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pagearXiv:1603.08721 accepted by Astronomy and Astrophysics
bordeaux.peerReviewedoui
hal.identifierhal-01294928
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01294928v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2016-03&rft.spage=arXiv:1603.08721%20%20accepted%20by%20Astronomy%20and%20Astrophysics&rft.epage=arXiv:1603.08721%20%20accepted%20by%20Astronomy%20and%20Astrophysics&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=BENZ,%20A.%20O.,&BRUDERER,%20S.,&VAN%20DISHOECK,%20E.%20F.,&MELCHIOR,%20M.,&WAMPFLER,%20S.%20F.,&rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée