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 report the results of a spectroscopic study of the Bootes III (BooIII)stellar overdensity carried out with the Hectospec multifiber spectrograph onthe MMT telescope. Radial velocities have been measured for 193 BooIIIcandidate stars selected to have magnitudes and colors consistent with itsupper main sequence and lower red giant branch, as well as a number ofhorizontal branch candidates. From 20 identified candidate BooIII members, wemeasure a systemic velocity of V_sun=197.5+-3.8 km/s and a velocity dispersionof sigma_o=14.0+-3.2 km/s. We use the somewhat large velocity dispersion andthe implied highly radial orbit, along with morphological evidence fromGrillmair (2009) and stellar abundances, to argue that BooIII is likely thefirst known object observed in a transitional state between being a bound dwarfgalaxy and a completely unbound tidal stream.

Kinematics and Metallicities in the Bootes III Stellar Overdensity: a Disrupted Dwarf Galaxy?