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

Here, we present a kinematical analysis of the Virgo cluster ultra-diffusegalaxy (UDG) VCC 1287 based on data taken with the Keck Cosmic Web Imager(KCWI). We confirm VCC 1287's association both with the Virgo cluster and itsglobular cluster (GC) system, measuring a recessional velocity of $1116 \pm 2\\mathrm{km\ s^{-1}}$. We measure a stellar velocity dispersion ($19 \pm 6\\mathrm{km\ s^{-1}}$) and infer both a dynamical mass ($1.11^{+0.81}_{-0.81}\times 10^{9} \ \mathrm{M_{\odot}}$) and mass to light ratio ($13^{+11}_{-11}$)within the half light radius (4.4 kpc). This places VCC 1287 slightly above thewell established relation for normal galaxies, with a higher mass to lightratio for its dynamical mass than normal galaxies. We use our dynamical mass,and an estimate of GC system richness, to place VCC 1287 on the GC number --dynamical mass relation, finding good agreement with a sample of normalgalaxies. Based on a total halo mass derived from GC counts, we then infer thatVCC 1287 likely resides in a cored or low concentration dark matter halo. Basedon the comparison of our measurements to predictions from simulations, we findthat strong stellar feedback and/or tidal effects are plausibly the dominantmechanisms in the formation of VCC 1287. Finally, we compare our measurement ofthe dynamical mass with those for other UDGs. These dynamical mass estimatessuggest relatively massive halos and a failed galaxy origin for at least someUDGs.

On the Stellar Kinematics and Mass of the Virgo Ultra-Diffuse Galaxy VCC 1287