Academic Journal
Preprint typeset using L ATEX style emulateapj v. 02/09/03 THE BIRTH OF MOLECULAR CLOUDS: FORMATION OF ATOMIC PRECURSORS IN COLLIDING FLOWS
| العنوان: | Preprint typeset using L ATEX style emulateapj v. 02/09/03 THE BIRTH OF MOLECULAR CLOUDS: FORMATION OF ATOMIC PRECURSORS IN COLLIDING FLOWS |
|---|---|
| المؤلفون: | Fabian Heitsch, Adrianne D. Slyz, Julien E. G. Devriendt, Lee W. Hartmann, Andreas Burkert |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://arxiv.org/pdf/astro-ph/0605435v1.pdf. |
| سنة النشر: | 2008 |
| المجموعة: | CiteSeerX |
| مصطلحات موضوعية: | show an abundance of internal structure, both in |
| الوصف: | Molecular Cloud Complexes (MCCs) are highly structured and “turbulent”. Observational evidence suggests that MCCs are dynamically dominated systems, rather than quasi-equilibrium entities. The observed structure is more likely a consequence of the formation process rather than something that is imprinted after the formation of the MCC. Converging flows provide a natural mechanism to generate MCC structure. We present a detailed numerical analysis of this scenario. Our study addresses the evolution of a MCC from its birth in colliding atomic hydrogen flows up until the point when H2 may begin to form. A combination of dynamical and thermal instabilities breaks up coherent flows efficiently, seeding the small-scale non-linear density perturbations necessary for local gravitational collapse and thus allowing (close to) instantaneous star formation. Many observed properties of MCCs come as a natural consequence of this formation scenario. Since converging flows are omnipresent in the ISM, we discuss the general applicability of this mechanism, from local star formation regions to galaxy mergers. Subject headings: turbulence — methods:numerical — ISM:molecular clouds 1. motivation Molecular Cloud Complexes (MCCs) in the Galaxy |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.337.5061; http://arxiv.org/pdf/astro-ph/0605435v1.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.337.5061 http://arxiv.org/pdf/astro-ph/0605435v1.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.1BA5A202 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |