SILCC-Zoom: The early impact of ionizing radiation on forming molecular clouds
SILCC-Zoom: The early impact of ionizing radiation on forming molecular clouds
复制标题
SILCC-Zoom:电离辐射对形成分子云的早期影响
DOI:
10.1093/mnras/sty2938
复制
发表时间:
2019
影响因子:
4.8
通讯作者:
T. Naab
中科院分区:
文献类型:
--
作者:
S. Haid;S. Walch;D. Seifried;R. Wünsch;F. Dinnbier;T. Naab
As part of the SILCC-Zoom project, we present our first sub-parsec resolution radiation-hydrodynamic simulations of two molecular clouds self-consistently forming from a turbulent, multiphase ISM. The clouds have similar initial masses of few 104, escape velocities of ∼5 km s−1, and a similar initial energy budget. We follow the formation of star clusters with a sink-based model and the impact of radiation from individual massive stars with the tree-based radiation transfer moduletreeray. Photoionizing radiation is coupled to a chemical network to follow gas heating, cooling, and molecule formation and dissociation. For the first 3 Myr of cloud evolution, we find that the overall star formation efficiency is considerably reduced by a factor of ∼4 to global cloud values of <10 per cent as the mass accretion of sinks that host massive stars is terminated after ≲1 Myr. Despite the low efficiency, star formation is triggered across the clouds. Therefore, a much larger region of the cloud is affected by radiation and the clouds begin to disperse. The time-scale on which the clouds are dispersed sensitively depends on the cloud sub-structure and in particular on the amount of gas at high visual extinction. The damage of radiation done to the highly shielded cloud (MC1) is delayed. We also show that the radiation input can sustain the thermal and kinetic energy of the clouds at a constant level. Our results strongly support the importance of ionizing radiation from massive stars for explaining the low-observed star formation efficiency of molecular clouds.
登录
查看更多内容
DOI:
10.1007/1-4020-2620-x_69
发表时间:
2003
期刊:
arXiv: Astrophysics
影响因子:
--
作者:
M. M. Low;M. D. Avillez;M. Korpi
通讯作者:
M. Korpi
影响因子:
4.8
作者:
C. Dobbs
通讯作者:
C. Dobbs
影响因子:
6.5
作者:
N. Markova;J. Puls
通讯作者:
J. Puls
影响因子:
4.8
作者:
J. Pittard
通讯作者:
J. Pittard
DOI:
10.3847/1538-4357/834/1/40
发表时间:
2016
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Corey S. Howard;R. Pudritz;R. Klessen
通讯作者:
R. Klessen