The Earliest Phases of Star Formation (EPoS): aHerschelkey project
| العنوان: | The Earliest Phases of Star Formation (EPoS): aHerschelkey project |
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| المؤلفون: | M. Hennemann, Zoltan Balog, Markus Nielbock, J. Tackenberg, A. Schmiedeke, N. Lippok, J. Steinacker, Oliver Krause, Ralf Launhardt, B. Stecklum, Sarah Ragan, H. Linz, Jan Pitann, Yancy L. Shirley, A. M. Stutz, Tigran Khanzadyan, M. Schmalzl, Henrik Beuther, Christophe Risacher, Stephan M. Birkmann, Jouni Kainulainen, Th. Henning |
| المساهمون: | Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG ), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, 2013, 551, ⟨10.1051/0004-6361/201220477⟩ Astronomy & astrophysics, 551:A98. EDP Sciences Astronomy & Astrophysics, 551, A98 |
| بيانات النشر: | EDP Sciences, 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | Continuum (design consultancy), FOS: Physical sciences, SPECTRAL ENERGY-DISTRIBUTIONS, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, SUBMILLIMETER CONTINUUM OBSERVATIONS, INITIAL CONDITIONS, ISM: clouds, PRESTELLAR CORES, DUST-TEMPERATURE, stars: low-mass, Thermal, Astrophysics::Solar and Stellar Astrophysics, Protostar, Black-body radiation, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, QB, infrared: ISM, Physics, BOK GLOBULE CB-26, stars: formation, stars: protostars, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], extinction, Star formation, Molecular cloud, Astronomy and Astrophysics, YOUNG STELLAR OBJECTS, Astrophysics - Astrophysics of Galaxies, DARK CLOUDS, Stars, Astrophysics - Solar and Stellar Astrophysics, INTERSTELLAR GAS, [SDU]Sciences of the Universe [physics], Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), dust, extinction, dust, PROTOSTELLAR CORES, Low Mass |
| الوصف: | The temperature and density structure of molecular cloud cores are the most important physical quantities that determine the course of the protostellar collapse and the properties of the stars they form. Nevertheless, density profiles often rely either on the simplifying assumption of isothermality or on observationally poorly constrained model temperature profiles. With the aim of better constraining the initial physical conditions in molecular cloud cores at the onset of protostellar collapse, we initiated the Guaranteed Time Key Project (GTKP) "The Earliest Phases of Star Formation" (EPoS) with the Herschel satellite. This paper gives an overview of the low-mass sources in the EPoS project, including all observations, the analysis method, and the initial results of the survey. We study the thermal dust emission of 12 previously well-characterized, isolated, nearby globules using FIR and submm continuum maps at up to eight wavelengths between 100 micron and 1.2 mm. Our sample contains both globules with starless cores and embedded protostars at different early evolutionary stages. The dust emission maps are used to extract spatially resolved SEDs, which are then fit independently with modified blackbody curves to obtain line-of-sight-averaged dust temperature and column density maps. We find that the thermal structure of all globules is dominated by external heating from the interstellar radiation field and moderate shielding by thin extended halos. All globules have warm outer envelopes (14-20 K) and colder dense interiors (8-12 K). The protostars embedded in some of the globules raise the local temperature of the dense cores only within radii out to about 5000 AU, but do not significantly affect the overall thermal balance of the globules. 35 pages, 47 figures, Accepted for publication in Astronomy and Astrophysics |
| وصف الملف: | application/pdf |
| تدمد: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361/201220477 |
| DOI: | 10.1051/0004-6361/201220477⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b4d491b0bf4679fc411f84fdd6c073e https://doi.org/10.1051/0004-6361/201220477 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....5b4d491b0bf4679fc411f84fdd6c073e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14320746 00046361 |
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| DOI: | 10.1051/0004-6361/201220477 |