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New Constraints on the Sulfur Reservoir in the Dense Interstellar Medium Provided by Spitzer Observations of S I in Shocked Gas
| dc.contributor.author | ANDERSON, Dana E. | |
| dc.contributor.author | BERGIN, Edwin A. | |
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| dc.contributor.author | MARET, Sébastien | |
| hal.structure.identifier | AMOR 2013 | |
| dc.contributor.author | WAKELAM, Valentine | |
| dc.date.issued | 2013-12 | |
| dc.identifier.issn | 0004-637X | |
| dc.description.abstractEn | We present observations of fine-structure line emission of atomic sulfur, iron, and rotational lines of molecular hydrogen in shocks associated with several Class 0 protostars obtained with the Infrared Spectrograph of the Spitzer Space Telescope. We use these observations to investigate the "missing sulfur problem," that significantly less sulfur is found in dense regions of the interstellar medium (ISM) than in diffuse regions. For sources where the sulfur fine-structure line emission is co-spatial with the detected molecular hydrogen emission and in the presence of weak iron emission, we derive sulfur and H2 column densities for the associated molecule-dominated C-shocks. We find the S I abundance to be gsim5%-10% of the cosmic sulfur abundance, indicating that atomic sulfur is a major reservoir of sulfur in shocked gas. This result suggests that in the quiescent dense ISM sulfur is present in some form that is released from grains as atoms, perhaps via sputtering, within the shock. | |
| dc.language.iso | en | |
| dc.publisher | American Astronomical Society | |
| dc.subject.en | astrochemistry | |
| dc.subject.en | ISM: abundances | |
| dc.subject.en | ISM: atoms | |
| dc.subject.en | ISM: molecules | |
| dc.title.en | New Constraints on the Sulfur Reservoir in the Dense Interstellar Medium Provided by Spitzer Observations of S I in Shocked Gas | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1088/0004-637X/779/2/141 | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| bordeaux.journal | The Astrophysical Journal | |
| bordeaux.page | 141 | |
| bordeaux.volume | 779 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00949933 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00949933v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Astrophysical%20Journal&rft.date=2013-12&rft.volume=779&rft.spage=141&rft.epage=141&rft.eissn=0004-637X&rft.issn=0004-637X&rft.au=ANDERSON,%20Dana%20E.&BERGIN,%20Edwin%20A.&MARET,%20S%C3%A9bastien&WAKELAM,%20Valentine&rft.genre=article |
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