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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

SDSS J0015+0104 is the lowest metallicity low surface brightness dwarf (LSBD)galaxy known. The oxygen abundance in its HII region SDSS J001520.70+010436.9(at ~1.5 kpc from the galaxy centre) is 12+log(O/H)=7.07 (Guseva et al.). Thisgalaxy, at the distance of 28.4 Mpc, appears to reside deeply in the volumedevoid of luminous massive galaxies, known as the Eridanus void. SDSSJ235437.29-000501.6 is another Eridanus void LSBD galaxy, with parameter12+log(O/H)=7.36 (also Guseva et al.). We present the results of their HIobservations with the Nancay Radio Telescope revealing their high ratios ofM(HI)/L_B ~2.3. Based on the Sloan Digital Sky Survey images, we derived forboth galaxies their radial surface brightness profiles and the main photometricparameters. Their colours and total magnitudes are used to estimate the galaxystellar mass and ages. The related gas mass-fractions, f_g ~0.98 and ~0.97, andthe extremely low metallicities (much lower than for their more typicalcounterparts with the same luminosity) indicate their unevolved status. Wecompare these Eridanus void LSBDs with several extreme LSBD galaxies residingin the nearby Lynx-Cancer void. Based on the combination of all their unusualproperties, the two discussed LSBD galaxies are similar to the unusual LSBDsresiding in the closer void. This finding presents additional evidence for theexistence in voids of a4 figures, sizable fraction of low-mass unevolvedgalaxies. Their dedicated search might result in the substantial increase ofthe number of such objects in the local Universe and in the advancement ofunderstanding their nature.

Properties of the most metal-poor gas-rich LSB dwarf galaxies SDSS J0015+0104 and J2354-0005 residing in the Eridanus void