%0 Generic %1 caldwell2014globular %A Caldwell, Nelson %A Strader, Jay %A Romanowsky, Aaron J. %A Brodie, Jean P. %A Moore, Ben %A Diemand, Jurg %A Martizzi, Davide %D 2014 %K cluster globular high-velocity virgo %T A Globular Cluster Toward M87 with a Radial Velocity < -1000 km/s: The First Hypervelocity Cluster %U http://arxiv.org/abs/1402.6319 %X We report the discovery of an object near M87 in the Virgo Cluster with an extraordinary blueshift of -1025 km/s, offset from the systemic velocity by >2300 km/s. Evaluation of photometric and spectroscopic data provides strong evidence that this object is a distant massive globular cluster, which we call HVGC-1 in analogy to Galactic hypervelocity stars. We consider but disfavor more exotic interpretations, such as a system of stars bound to a recoiling black hole. The odds of observing an outlier as extreme as HVGC-1 in a virialized distribution of intracluster objects are small; it appears more likely that the cluster was (or is being) ejected from Virgo following a three-body interaction. The nature of the interaction is unclear, and could involve either a subhalo or a binary supermassive black hole at the center of M87.

@misc{caldwell2014globular, abstract = {We report the discovery of an object near M87 in the Virgo Cluster with an extraordinary blueshift of -1025 km/s, offset from the systemic velocity by >2300 km/s. Evaluation of photometric and spectroscopic data provides strong evidence that this object is a distant massive globular cluster, which we call HVGC-1 in analogy to Galactic hypervelocity stars. We consider but disfavor more exotic interpretations, such as a system of stars bound to a recoiling black hole. The odds of observing an outlier as extreme as HVGC-1 in a virialized distribution of intracluster objects are small; it appears more likely that the cluster was (or is being) ejected from Virgo following a three-body interaction. The nature of the interaction is unclear, and could involve either a subhalo or a binary supermassive black hole at the center of M87.}, added-at = {2014-02-27T08:25:48.000+0100}, author = {Caldwell, Nelson and Strader, Jay and Romanowsky, Aaron J. and Brodie, Jean P. and Moore, Ben and Diemand, Jurg and Martizzi, Davide}, biburl = {https://www.bibsonomy.org/bibtex/2c5b0ef0bb86d127a6ddd03c4c1725a84/miki}, description = {[1402.6319] A Globular Cluster Toward M87 with a Radial Velocity &lt; -1000 km/s: The First Hypervelocity Cluster}, interhash = {796bfa0e20c920739fabb25474be9172}, intrahash = {c5b0ef0bb86d127a6ddd03c4c1725a84}, keywords = {cluster globular high-velocity virgo}, note = {cite arxiv:1402.6319Comment: submitted to ApJL, comments welcome}, timestamp = {2014-02-27T08:25:48.000+0100}, title = {A Globular Cluster Toward M87 with a Radial Velocity < -1000 km/s: The First Hypervelocity Cluster}, url = {http://arxiv.org/abs/1402.6319}, year = 2014 }