RXTE Detects 'Heartbeat' Of Smallest Black Hole Candidate

  • Released Thursday, December 15, 2011
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Data from NASA's Rossi X-ray Timing Explorer (RXTE) satellite has identified a candidate for the smallest-known black hole. The evidence comes from a specific type of X-ray pattern — nicknamed a "heartbeat" because of its resemblance to an electrocardiogram — that 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 pairs a normal star with a black hole that may weigh less than three times the sun's mass, near the theoretical boundary where black-hole status first becomes possible. Flare-ups occur when 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 radiate X-rays.

The record-holder for ubiquitous X-ray variability is another black hole binary named GRS 1915+105. This system is unique in displaying more than a dozen highly structured patterns — typically lasting between seconds and hours — that scientists distinguish by Greek-letter names. Seven of these patterns are now seen in IGR J17091, including the so-called rho-class oscillations that astronomers describe them as the "heartbeat" of black hole systems.

It's thought that strong magnetic fields near the black hole's event horizon eject some of the gas into dual, oppositely directed jets that blast outward at nearly 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 in GRS 1915 reveal that the innermost region of the disk emits enough radiation to push back the gas, creating a strong outward wind that staunches 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 so hot that it essentially disintegrates and plunges toward the black hole, re-establishing the jet and beginning the cycle anew.

In GRS 1915+105, which at 14 solar masses is by for the more massive of the two, this cycle can take as little as 40 seconds. In IGR J17091, the emission can be 20 times fainter than GRS 1915, and the heartbeat cycle can occur up to eight times faster.

Download the animations here.

Artist's rendering showing the black hole and its accretion disk before the jet emerges.

Artist's rendering showing the black hole and its accretion disk before the jet emerges.

Artist's rendering showing the onset of the disk wind, which shuts down the jet.

Artist's rendering showing the onset of the disk wind, which shuts down the jet.

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Credits

Please give credit for this item to:
NASA/Goddard Space Flight Center/CI Lab

Release date

This page was originally published on Thursday, December 15, 2011.
This page was last updated on Wednesday, May 3, 2023 at 1:53 PM EDT.


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This visualization originally appeared on the following tapes:
  • Black Hole Heartbeat (ID: 2011124)
    Monday, December 12, 2011 at 5:00AM
    Produced by - Robert Crippen (NASA)