Rodriguez and colleagues used detailed computer models to demonstrate how a globular cluster
acts as a dominant source of binary black holes, producing hundreds of black hole mergers over a cluster's 12-billion-year lifetime.
ISLAMABAD -- Astronomers have discovered what may be the first known example of a globular cluster
about to be born - an incredibly massive and extremely dense yet star-free cloud of molecular gas.
The globular cluster
NGC 7078 (M15) stands out amazingly clearly against the background star field situated only 3 degrees west of the magnitude 2.
Visually it appeared much like a globular cluster
, though deep images showed a faint ion tail.
Almost 95 percent of globular cluster
formation occurred within the first 1 billion to 2 billion years after our universe was born in the theorized Big Bang 13.
Using NASA's Hubble Space Telescope, astronomers observed 47 Tucanae, a globular cluster
approximately 16,700 light-years from Earth.
Topics include magnetic relaxation in rotating stellar radiation zones, globular cluster
clumpy tidal tails, electromagnetic signals from black hole mergers, the AMUSE software toolkit, and GPU-accelerated Monte Carlo simulation of dense stellar systems.
Tolkien in his fantasy The Hobbit unwittingly devised an exquisite description of a globular cluster
when he described the fabulous jewel called the "Arkenstone of Thrain": "It was as if a globe had been filled with moonlight and hung before them in a net woven of the glint of frosty stars.
Another of Steve's images is that of M13, the great globular cluster
in Hercules which contains hundreds of thousands of stars and is approximately 145 light years across so the stars are crammed together in a very dense ball.
NASA has unveiled the first of the colourful images, which include the planet Jupiter, a stellar nursery, a globular cluster
and a dying star.
Observations of the precession of the millisecond pulsar PSR B1516+O2B, located some 25,000 light-years away in the globular cluster
M5, indicate that the pulsar most likely has a mass equivalent to about 1.
The data shows correlations between the black hole mass and the elliptical galaxy mass or globular cluster