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      Winds and radiation in unison: a new semi-analytic feedback model for cloud dissolution

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          Abstract

          \(\rm Context\): Star clusters interact with the ISM in various ways, most importantly in the destruction of molecular star-forming clouds, resulting in inefficient star formation on galactic scales. On cloud scales, ionizing radiation creates \hii regions, while stellar winds and supernovae drive the ISM into thin shells. These shells are accelerated by the combined effect of winds, radiation pressure and supernova explosions, and slowed down by gravity. Since radiative and mechanical feedback is highly interconnected, they must be taken into account in a self-consistent and combined manner, including the coupling of radiation and matter. \(\rm Aim\): We seek to identify the efficiency with which different stellar feedback mechanisms couple to the dynamical evolution of isolated massive clouds (\(\geq 10^5\,M_{\odot}\)) and self-consistently solve for the dynamical expansion resulting from feedback. \(\rm Methods\): We present a new semi-analytic one-dimensional feedback model to calculate shell dynamics and structure simultaneously. It allows us to scan a large range of physical parameters and to estimate escape fractions of ionizing radiation \(f_{\rm{esc,i}}\), the minimum star formation efficiency \(\epsilon_{\rm{min}}\) required to drive an outflow, and recollapse time scales for clouds that are not destroyed by feedback. \(\rm Results\): We find that there is no simple answer to the question of what dominates cloud dynamics, and that each feedback process significantly influences the efficiency of the others. We show that variations in natal cloud density can very easily explain differences between dense-bound and diffuse-open star clusters. We also predict a 4-6 Myr age difference for massive clusters with multiple generations as a consequence of feedback.

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          Author and article information

          Journal
          2017-04-13
          Article
          1704.04240
          c6e9ad0f-e87d-4163-8bcc-00b0274f6905

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          16 pages, 11 figures (additional 5 pages and 33 figures in appendix), submitted to MNRAS
          astro-ph.GA

          Galaxy astrophysics
          Galaxy astrophysics

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