Dec 15 2011
From The Space Library
NASA's RXTE Detects 'Heartbeat' of Smallest Black Hole Candidate
WASHINGTON -- An international team of astronomers has identified a candidate for the smallest-known black hole using data from NASA's Rossi X-ray Timing Explorer (RXTE). The evidence comes from a specific type of X-ray pattern, nicknamed a "heartbeat" because of its resemblance to an electrocardiogram. The pattern until now has been recorded in only one other black hole system.
Named IGR J17091-3624 after the astronomical coordinates of its sky position, the binary system combines a normal star with a black hole that may weigh less than three times the sun's mass. That is near the theoretical mass boundary where black holes become possible.
Gas from the normal star streams toward the black hole and forms a disk around it. Friction within the disk heats the gas to millions of degrees, which is hot enough to emit X-rays. Cyclical variations in the intensity of the X-rays observed reflect processes taking place within the gas disk. Scientists think that the most rapid changes occur near the black hole's event horizon, the point beyond which nothing, not even light, can escape.
Astronomers first became aware of the binary system during an outburst in 2003. Archival data from various space missions show it becomes active every few years. Its most recent outburst started in February and is ongoing. The system is located in the direction of the constellation Scorpius, but its distance is not well established. It could be as close as 16,000 light-years or more than 65,000 light-years away.
The record-holder for wide-ranging X-ray variability is another black hole binary system named GRS 1915+105. This system is unique in displaying more than a dozen highly structured patterns, typically lasting between seconds and hours.
"We think that most of these patterns represent cycles of accumulation and ejection in an unstable disk, and we now see seven of them in IGR J17091," said Tomaso Belloni at Brera Observatory in Merate, Italy. "Identifying these signatures in a second black hole system is very exciting."
In GRS 1915, strong magnetic fields near the black hole's event horizon eject some of the gas into dual, oppositely directed jets that blast outward at about 98 percent the speed of light. The peak of its heartbeat emission corresponds to the emergence of the jet.
Changes in the X-ray spectrum observed by RXTE during each beat reveal that the innermost region of the disk emits enough radiation to push back the gas, creating a strong outward wind that stops the inward flow, briefly starving the black hole and shutting down the jet. This corresponds to the faintest emission. Eventually, the inner disk gets so bright and hot it essentially disintegrates and plunges toward the black hole, re-establishing the jet and beginning the cycle anew. This entire process happens in as little as 40 seconds.
While there is no direct evidence IGR J17091 possesses a particle jet, its heartbeat signature suggests that similar processes are at work. Researchers say that this system's heartbeat emission can be 20 times fainter than GRS 1915 and can cycle some eight times faster, in as little as five seconds.
Astronomers estimate that GRS 1915 is about 14 times the sun's mass, placing it among the most-massive-known black holes that have formed because of the collapse of a single star. The research team analyzed six months of RXTE observations to compare the two systems, concluding that IGR J17091 must possess a minuscule black hole.
"Just as the heart rate of a mouse is faster than an elephant's, the heartbeat signals from these black holes scale according to their masses," said Diego Altamirano, an astrophysicist at the University of Amsterdam in The Netherlands and lead author of a paper describing the findings in the Nov. 4 issue of The Astrophysical Journal Letters.
The researchers say this analysis is just the start of a larger program to compare both of these black holes in detail using data from RXTE, NASA's Swift satellite and the European XMM-Newton observatory.
"Until this study, GRS 1915 was essentially a one-off, and there's only so much we can understand from a single example," said Tod Strohmayer, the project scientist for RXTE at NASA's Goddard Space Flight Center in Greenbelt, Md. "Now, with a second system exhibiting similar types of variability, we really can begin to test how well we understand what happens at the brink of a black hole."
Launched in late 1995, RXTE is second only to Hubble as the longest serving of NASA's operating astrophysics missions. RXTE provides a unique observing window into the extreme environments of neutron stars and black holes.
NASA TAKES NEXT STEP IN DEVELOPING COMMERCIAL CREW PROGRAM Competitive Agreements Will Keep U.S. Commercial Space Program on Track
WASHINGTON -- NASA announced today a modified competitive procurement strategy to keep on track the agency’s plan to have U.S. companies transport American astronauts into space instead of outsourcing this work to foreign governments.
Instead of awarding contracts for the next phase of the Commercial Crew Program, the agency plans to use multiple, competitively awarded Space Act Agreements. Using competitive Space Act Agreements instead of contracts will allow NASA to maintain a larger number of partners during this phase of the program, with the flexibility to adjust technical direction, milestones and funding.
This flexibility is important during a period of high budget uncertainty when NASA is receiving less funding than President Obama requested for the agency’s commercial space program.
"NASA is committed to ensuring that U.S. companies are sending American astronauts into space," NASA Administrator Charles Bolden said. "This new acquisition strategy will allow us to preserve competition as we maintain our momentum to provide a U.S.-based commercial crew launch capability at the earliest possible time."
This competitive Space Act solicitation is separate from the work being carried out under existing Space Act Agreements. The new competition will focus on an overall system design rather than single technology activities. Details on the new competition will be available in January.
The announcement for proposals is expected in the first quarter of 2012. These competitively awarded Space Acts will be followed by a competitively awarded contract for the certification phase. The certification phase will ensure that the designs fully meet the safety and performance requirements for NASA utilization.
NASA to Discuss Plans for Commercial Crew Development
WASHINGTON -- NASA will host a media teleconference today, Thursday, Dec. 15, at 11:30 a.m. EST, to discuss a modified competitive procurement strategy for the Commercial Crew Program. The program will assist industry in developing a commercial system that will transport American astronauts into space.
The teleconference participant is: -- William Gerstenmaier, Associate Administrator, Human Exploration and Operations Mission Directorate, NASA Headquarters, Washington.
