Astronomy:HVGC-1
Coordinates: 
12h 30m 54.6978s, +12° 40′ 58.61″
| HVGC-1 [1] | |
|---|---|
| Observation data (J2000.0[1] epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 30m 54.70s [1] |
| Declination | +12° 40′ 58.61″ [1] |
| Distance | 54 Mly (16.5 Mpc [1]) |
| Physical characteristics | |
| Metallicity | [math]\displaystyle{ \begin{smallmatrix}\left[\ce{Fe}/\ce{H}\right]\end{smallmatrix} }[/math] = −0.9±0.3 [1] dex |
| Notable features | First discovered hypervelocity globular cluster |
| Other designations | HVGC-1,[1] H70848,[1] M87 H70848[1] |
HVGC-1 is the first discovered hypervelocity globular cluster.[2] Discovered in 2014, it was found escaping the supergiant elliptical galaxy Messier 87,[3] in the Virgo Cluster.[1] It is one of thousands of globular clusters found in M87.[4] It is the first hypervelocity star cluster so far discovered.[5] The globular is located at decimal degrees (RA, DEC) (187.72791°, +12.68295°).[1]
Properties
The object was observed to have an outlier velocity, ending with a determined radial velocity of −1026±13 km/s. In relation to M87, its velocity was determined to be 2100–2300 km/s. The cluster's velocity is so high that it will escape the Virgo Cluster as well.[1]
The cluster's velocity is thought to originate by being ejected by the supermassive black hole at the center of M87, when the black hole stripped the outer layers of HVGC-1 off, it also ejected the remaining core with greater than escape velocity.[2]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Nelson Caldwell (CfA), Jay Strader (Michigan St), Aaron J. Romanowsky (San Jose St/Santa Cruz), Jean P. Brodie (Santa Cruz), Ben Moore (Zurich), Jurg Diemand (Zurich), Davide Martizzi (Berkeley) (25 February 2014). "A Globular Cluster Toward M87 with a Radial Velocity < -1000 km/s: The First Hypervelocity Cluster". The Astrophysical Journal 787 (1). doi:10.1088/2041-8205/787/1/L11. Bibcode: 2014ApJ...787L..11C.
- ↑ 2.0 2.1 "Entire Star Cluster Thrown Out of its Galaxy". CfA - Harvard-Smithsonian Center for Astrophysics. 30 April 2014. http://www.cfa.harvard.edu/news/2014-09.
- ↑ Klaus Schmidt (30 April 2014). "Entire Star Cluster Thrown Out of its Galaxy". Space Fellowship. http://spacefellowship.com/news/art38359/entire-star-cluster-thrown-out-of-its-galaxy.html.
- ↑ "Star cluster thrown out of galaxy at speed of more than 2 million mph". Fox News. 30 April 2014. http://www.foxnews.com/science/2014/04/30/runaway-star-cluster-traveling-at-more-than-two-million-miles-per-hour/.
- ↑ Shannon Hill (30 April 2014). "'Runaway' Star Cluster Breaks Free from Distant Galaxy". Universe Today. http://www.universetoday.com/111609/runaway-star-cluster-breaks-free-from-distant-galaxy/.
 |  |
