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

We investigate the growth histories of dark matter halos associated withdwarf satellites in Local Group galaxies and the resultant evolution of thebaryonic component. Our model is based on the recently proposed property thatthe mean surface density of a dark halo inside a radius at maximum circularvelocity V_max is universal over a large range of V_max. Following that thissurface density of 20 Msun/pc^2 well explains dwarf satellites in the Milky Wayand Andromeda, we find that the evolution of the dark halo in this commonsurface-density scale is characterized by the rapid increase of the halo massassembled by the redshift z_TT of the tidal truncation by its host halo, atearly epochs of z_TT >~ 6 or V_max <~ 22 km/s. This mass growth of the halo isslow at lower z_TT or larger V_max. Taking into account the baryon content inthis dark halo evolution, under the influence of the ionizing backgroundradiation, we find that the dwarf satellites are divided into roughly twofamilies: those with V_max <~ 22 km/s having high star formation efficiency andthose with larger V_max having less efficient star formation. Thissemi-analytical model is in good agreement with the high-resolution numericalsimulation for galaxy formation and with the observed star formation historiesfor Fornax and Leo~II. This suggests that the evolution of a dark halo plays akey role in understanding star formation histories in dwarf satellites.

Evolution of dwarf spheroidal satellites in the common surface-density dark halos