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

To determine whether or not H II starburst galaxies (H IIG) arestandardizable candles, we study the correlation between the H$\beta$luminosity ($L$) and the velocity dispersion ($\sigma$) of the ionized gas fromH IIG measurements by simultaneously constraining the $L-\sigma$ relationparameters and the cosmological model parameters. We investigate six flat andnonflat relativistic dark energy cosmological models, spatially flat andnonflat, and with cosmological constant or dynamical dark energy. We find thatlow-redshift and high-redshift H IIG data subsets are standardizable but obeydifferent $L-\sigma$ relations. Current H IIG data are too sparse and toonon-uniformly distributed in redshift to allow for a determination of whetherwhat we have found is just a consequence of H IIG evolution. Until this issueis better understood, H IIG data cosmological constraints must be treated withcaution.

Low- and high-redshift H II starburst galaxies obey different luminosity-velocity dispersion relations