English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study effects of the fully ionized initial state, or pre-ionization, onthe subsequent thermal evolution of low-metallicity clouds under variousintensities of the external far-ultraviolet(FUV) and cosmic-ray(CR) fields. Thepre-ionization significantly affects the thermal and dynamical evolution ofmetal-free clouds without FUV/CRs by way of efficient HD formation. On theother hand, the pre-ionization effect on the thermal evolution is limited invery low-density regime for more metal-enriched clouds ([Z/H] >~ -4) or thoseunder modest FUV (>10^{-3}) or CR field (>0.1 of the present-day Galactic disklevels). In any case, for >10^8 cm^{-3}, neither the initial ionization statenor the irradiating FUV strength affect the thermal evolution. The dust coolingis an important mechanism for making sub-solar mass fragments inlow-metallicity gas. Since this fragmentation occurs at the temperature minimumby the dust cooling at >10^{10} cm^{-3}, this process is not vulnerable eitherto initial ionization state or external radiation.

publications of the astronomical society of japan

Do the environmental conditions affect the dust-induced fragmentation in  low-metallicity clouds ?: Effect of pre-ionization and  far-ultraviolet/cosmic-ray fields