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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present low resolution, visible light spectra of 41 star clusters in thespiral galaxy M101, taken with the Gemini/GMOS instrument. We measure Lickindices for each cluster and compare with BaSTI models to estimate their agesand metallicities. We also measure the line-of-sight velocities. We find that25 of the clusters are fairly young massive clusters (YMCs) with ages ofhundreds of Myr, and 16 appear to be older, globular clusters (GCs). There areat least four GCs with best fit ages of approximately 1-3 Gyr and eight withbest fit ages of approximately 5-10 Gyr. The mean metallicity of the YMCs is[Fe/H] of approximately -0.1 and for the GCs is [Fe/H] of approximately -0.9.We find a near-continuous spread in both age and metallicity for our sample,which may indicate that M101 had a more-or-less continuous history of clusterand star formation. From the kinematics, we find that the YMCs rotate with theHI gas fairly well, while the GCs do not. We cannot definitively say whetherthe GCs sampled here lie in an inner halo, thick disk, or bulge/psuedobulgecomponent, although given the very small bulge in M101, the last seemsunlikely. The kinematics and ages of the YMCs suggest that M101 may haveundergone heating of its disk or possibly a continuous merger/accretion historyfor the galaxy.

Gemini Spectra of Star Clusters in the Spiral Galaxy M101