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

A clear link between a dwarf-dwarf merger event and enhanced star formation(SF) in the recent past was recently identified in the gas-dominated mergerremnant VCC 848, offering by far the clearest view of a gas-rich late-stagedwarf-dwarf merger. We present a joint analysis of JVLA HI emission-linemapping, optical imaging and numerical simulations of VCC 848, in order toexamine the impact of the merger on the stellar and gaseous distributions. VCC848 has less than 30% of its HI gas concentrated within the centralhigh-surface-brightness star-forming region, while the remaining HI isentrained in outlying tidal features. Particularly, a well-defined tidal armreaches N(HI) comparable to the galaxy center but lacks SF. The molecular gasmass inferred from the current SF rate (SFR) dominates over the atomic gas massin the central ~ 1.5 kpc. VCC 848 is consistent with being a main-sequencestar-forming galaxy for its current stellar mass and SFR. The HII regionluminosity distribution largely agrees with that of normal dwarf irregularswith similar luminosities, except that the brightest HII region isextraordinarily luminous. Our N-body/hydrodynamical simulations imply that VCC848 is a merger between a gas-dominated primary progenitor and a gas-bearingstar-dominated secondary. The progenitors had their first passage on anear-radial non-coplanar orbit more than 1 Gyr ago. The merger did not build upa core as compact as typical compact dwarfs with centralized starburst, whichmay be partly ascribed to the star-dominated nature of the secondary, and in ageneral sense, a negative stellar feedback following intense starburststriggered at early stages of the merger.

The Blue Compact Dwarf Galaxy VCC 848 Formed by Dwarf-Dwarf Merging: HI Gas, Star Formation and Numerical Simulations