Formation of proto-globular cluster candidates in cosmological simulations of dwarf galaxies at <i>z</i> &gt; 4
نویسندگان
چکیده
We perform cosmological hydrodynamical simulations to study the formation of proto-globular cluster candidates in progenitors present-day dwarf galaxies $(M_{\rm vir} \approx 10^{10}\, {\rm M}_\odot$ at $z=0$) as part "Feedback Realistic Environment" (FIRE) project. Compact ($r_{1/2}<30$ pc), relatively massive ($0.5 \times 10^5 \lesssim M_{\star}/{\rm M}_\odot 5\times10^5$), self-bound stellar clusters form $11\gtrsim z \gtrsim 5$ with $M_{\rm 10^9\,{\rm M}_\odot$. Cluster is triggered when least $10^7\,{\rm dense, turbulent gas reaches $\Sigma_{\rm gas} 10^4\, M}_\odot\, pc}^{-2}$ a result compressive effects supernova feedback or from cloud-cloud collisions. The can survive for $2-3\,{\rm Gyr}$; absent numerical effects, they would likely substantially longer, perhaps $z=0$. longest-lived are those that significant distance -- several hundreds pc their host galaxy. therefore predict globular forming will be offset any pre-existing stars within dark matter halos opposed deeply embedded well-defined Properties nascent consistent observations some faintest and most compact high-redshift sources \textit{Hubble Space Telescope} lensing fields edge what detectable point deep imaging non-lensed \textit{James Webb Telescope}. By contrast, star clusters' remain undetectable.
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2023
ISSN: ['0035-8711', '1365-8711', '1365-2966']
DOI: https://doi.org/10.1093/mnras/stad1071