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 Tools annual

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 Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

In the framework of an ongoing project aimed at searching for and studyingeXtremely Metal-Poor (XMP) very gas-rich blue dwarfs in nearby voids, weconducted spectroscopy with the 11-m Southern African Large Telescope (SALT) of26 candidates, preselected in the first paper of this series (PEPK19). For 23of them, we detected Oxygen lines, allowing us to estimate the gas O/H ratio.For ten of them, the oxygen abundance is found to be very low, in the range of12+log(O/H)=6.95-7.30 dex. Of those, four void dwarfs have 12+log(O/H) < 7.19,or Z < Zo/30. For the majority of observed galaxies, the faint line [OIII]4363Aused to estimate O/H with the direct T_e method appeared either too noisy orwas not detected. We therefore use the semi-empirical method of Izotov, Thuan(2007) for these spectra, or, when applicable, the new 'Strong line' method ofIzotov et al. (2019b). We present and discuss the results for all void dwarfsobserved in this work. We also compare their O/H values with O/H values of ~140void galaxies available from our recent papers. We address the properties ofthe newly found unusual void XMP dwarfs and compare them with those for tenknown prototype void XMP objects. The latter small group is outstanding basedon their very small mass fraction of stars (only 0.01--0.02 of the baryonicmass), the blue colours of stars in the outer body (indicating anon-cosmological age for the main star-forming episode), and the low gasmetallicity (several times lower than expected for their luminosity).

XMP gas-rich dwarfs in Nearby Voids: results of SALT spectroscopy