Hubble Space Telescope Imaging of the Ultra-Compact High Velocity Cloud
  AGC 226067: A stripped remnant in the Virgo Cluster
  We analyze the optical counterpart to the ultra-compact high velocity cloud
AGC 226067, utilizing imaging taken with the Advanced Camera for Surveys (ACS)
on the Hubble Space Telescope. The color magnitude diagram of the main body of
AGC 226067 reveals an exclusively young stellar population, with an age of
$\sim$7--50 Myr, and is consistent with a metallicity of [Fe/H]$\sim$$-$0.3 as
previous work has measured via HII region spectroscopy. Additionally, the color
magnitude diagram is consistent with a distance of $D$$\approx$17 Mpc,
suggesting an association with the Virgo cluster. A secondary stellar system
located $\sim$1.6' ($\sim$8 kpc) away in projection has a similar stellar
population. The lack of an old red giant branch ($\gtrsim$5 Gyr) is contrasted
with a serendipitously discovered Virgo dwarf in the ACS field of view (Dw
J122147+132853), and the total diffuse light from AGC~226067 is consistent with
the luminosity function of the resolved $\sim$7--50 Myr stellar population. The
main body of AGC~226067 has a $M_{V}$=$-$11.3$\pm$0.3, or
$M_{stars}$=5.4$\pm$1.3$\times$10$^4$ $M_{\odot}$ given the stellar population.
We searched 20 deg$^2$ of imaging data adjacent to AGC~226067 in the Virgo
Cluster, and found two similar stellar systems dominated by a blue stellar
population, far from any massive galaxy counterpart -- if this population has
similar star formation properties as AGC~226067, it implies $\sim$0.1
$M_{\odot}$ yr$^{-1}$ in Virgo intracluster star formation. Given its unusual
stellar population, AGC~226067 is likely a stripped remnant and is plausibly
the result of compressed gas from the ram pressure stripped M86 subgroup
($\sim$350 kpc away in projection) as it falls into the Virgo Cluster.
