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 present the results of the spectroscopic and photometric follow-up of twofield galaxies that were selected as possible stellar counterparts of localhigh velocity clouds. Our analysis shows that the two systems are distant (D>20Mpc) dwarf irregular galaxies unrelated to the local HI clouds. However, thenewly derived distance and structural parameters reveal that the two galaxieshave luminosities and effective radii very similar to the recently identifiedUltra Diffuse Galaxies (UDGs). At odds with classical UDGs, they are remarkablyisolated, having no known giant galaxy within ~2.0 Mpc. Moreover, one of themhas a very high gas content compared to galaxies of similar stellar mass, witha HI to stellar mass ratio M_HI/M_* ~90, typical of almost-dark dwarfs.Expanding on this finding, we show that extended dwarf irregulars overlap thedistribution of UDGs in the M_V vs. log(r_e) plane and that the sequenceincluding dwarf spheroidals, dwarf irregulars and UDGs appears as continuouslypopulated in this plane.

Redshift, metallicity and size of two extended dwarf Irregular galaxies. A link between dwarf Irregulars and Ultra Diffuse Galaxies?