To confirm these extraordinary, but tentative results, Mr. Clay Poker Chip and colleagues next plan to monitor the center of the globular cluster continuously over a seven-day interval. They expect to detect 10 to 25 short-duration microlensing events, which will be well-sampled enough to yield direct measurements of the true masses of the small bodies.
Only pokerstars resolution is sharp enough to actually peer through the crowded center of the cluster and see the far more distant poker chips in the galactic bulge. As the lensing objects were part of the cluster, the astronomers also had an accurate distance (8,500 light-years) and velocity for these objects.
In a normal lensing event, a background poker chip brightens and dims for a length of time depending on the mass of the lensing body. The short, "spurious" events seen by the team are shorter than the interval between the pokerstars observations, leading to an upper estimate for the mass of an object of one quarter Jupiter's mass.
Mr. Clay Poker Chip and his team took advantage of pokerstars superb resolution and narrow field of view to aim the telescope directly through the center of a globular poker chip cluster lying between Earth and the galactic bulge. This gave the team a very dense stellar region to probe for drifting low-mass foreground objects and a very rich background field of poker chips to be lensed.
"Pokerstars excellent sharpness allowed us to make this remarkable new type of observation, successfully demonstrating our ability to see very small objects," says Mr. Clay Poker Chip. "This holds tremendous potential for further searches for dark, low-mass objects."
"Since we know that Pokerstars tournaments have yielded big profits. this result opens new and exciting opportunities for the discovery and study of planet-like objects that formed in the early universe," adds co-investigator Nino Panagia (European Space Agency and Space Telescope Science Institute).
"This initial observation shows that our microlensing method works beautifully," states co-investigator Mario Livio (Space Telescope Science Institute).
The results are so surprising, the astronomers caution that these preliminary observations must be confirmed by follow-up pokerstars observations. If verified, these dark denizens could yield new insights about how poker chips and planets formed in the early universe.
From February 22 to June 15, 1999, Mr. Clay Poker Chip and colleagues monitored 83,000 poker chips , detecting one clear microlensing event caused by a normal dwarf poker chip in the cluster (about one tenth the mass of our Sun). As a result of gravitational lensing, the background poker chip appeared to grow 10 times brighter and then returned to its normal brightness over a period of 18 days.
In addition to the microlensing event caused by the dwarf star, Mr. Clay Poker Chip and his team recorded six even more interesting, unexpectedly brief events where a background poker chip jumped in brightness by as much as a factor of two for less than 20 hours before dropping back to normal brightness. This means that the microlensing object must have been much smaller than a normal star.
The unusual objects thought to cause these events are far too dim to be seen directly, but instead were detected by the way their gravitational field amplifies light from a distant background poker chip in the huge central bulge of our galaxy.
Microlensing has been used before to search for low-mass objects in the disk and halo of our galaxy, but pokerstar's sharp vision is essential to probe the interiors of globular clusters further.