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 use Keck/DEIMOS spectroscopy to measure the first velocity and metallicityof a dwarf spheroidal (dSph) galaxy beyond the Local Group using resolvedstars. Our target, d0944+71, is a faint dSph found in the halo of the massivespiral galaxy M81 by Chiboucas et al. We coadd the spectra of 27 individualstars and measure a heliocentric radial velocity of $-38\pm10$~km/s. Thisvelocity is consistent with d0944+71 being gravitationally bound to M81. Wecoadd the spectra of the 23 stars that are consistent with being red giantbranch stars and measure an overall metallicity of ${\rm [Fe/H]}=-1.3 \pm 0.3$based on the calcium triplet lines. This metallicity is consistent withd0944+71 following the metallicity$-$luminosity relation for Local Group dSphs.We investigate several potential sources of observational bias but find thatour sample of targeted stars is representative of the metallicity distributionfunction of d0944+71 and any stellar contamination due to seeing effects isnegligible. The low ellipticity of the galaxy and its position in themetallicity$-$luminosity relation suggest that d0944+71 has not been affectedby strong tidal stripping.

Spectroscopic confirmation of the dwarf spheroidal galaxy d0944+71 as a member of the M81 group of galaxies