Black hole-star pair orbiting at dizzying speed (w/ video)

March 19, 2013

(Phys.org) —ESA's XMM-Newton space telescope has helped to identify a star and a black hole that orbit each other at the dizzying rate of once every 2.4 hours, smashing the previous record by nearly an hour.

The black hole in this compact pairing, known as MAXI J1659-152, is at least three times more massive than the Sun, while its red star has a mass only 20% that of the Sun. The pair is separated by roughly a million kilometres.

The duo were discovered on 25 September 2010 by NASA's Swift and were initially thought to be a gamma-ray burst. Later that day, Japan's MAXI telescope on the found a bright X-ray source at the same place.

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MAXI J1659–152 is a rapidly spinning binary system comprising a black hole more than three times more massive than the Sun and a red dwarf companion star only 20% the mass of the Sun. The pair are separated by only 1.3 solar radii, or just under one million kilometres. Thanks to a 14.5 hour observing campaign by ESA’s XMM-Newton, scientists were able to measure a record-breaking orbital period of just 2.4 hours – the fastest spinning binary system with a black hole. The black hole orbits around the system’s common centre of mass at 150 000 km/h, while the companion travels at two million kilometres per hour, making it the fastest-moving star ever seen in a binary system. The centre of mass is so close to the black hole due to its vast mass that it appears as if it is not orbiting. In this animation the focus is on the periodic absorption dips detected by XMM-Newton as the stream of material from the companion impacts on the black hole’s accretion disc. The system was first found on 25 September 2010 by NASA’s Swift space telescope, with follow-up observations by the Japanese MAXI instrument on the International Space Station, NASA’s Rossi X-ray Timing Explorer, ESA’s XMM-Newton and ESO’s ground-based Very Large Telescope. Credit: ESA

More observations from ground and space telescopes, including XMM-Newton, revealed that the X-rays come from a black hole feeding off material ripped from a tiny companion.

Several regularly-spaced dips in the emission were seen in an uninterrupted 14.5 hour observation with XMM-Newton, caused by the uneven rim of the black hole's briefly obscuring the X-rays as the system rotates, its disc almost edge-on along XMM-Newton's line of sight.

From these dips, an orbital period of just 2.4 hours was measured, setting a new record for black hole X-ray binary systems. The previous record-holder, Swift J1753.5–0127, has a period of 3.2 hours.

The black hole and the star orbit their common centre of mass. Because the star is the lighter object, it lies further from this point and has to travel around its larger orbit at a breakneck speed of two million kilometres per hour – it is the fastest moving star ever seen in an X-ray . On the other hand, the black hole orbits at 'only' 150 000 km/h.

"The revolves around the common centre of mass at a dizzying rate, almost 20 times faster than Earth orbits the Sun. You really wouldn't like to be on such a merry-go-round in this Galactic fair!" says lead author Erik Kuulkers of ESA's European Space Astronomy Centre in Spain.

His team also saw that they lie high above the Galactic plane, out of the main disc of our spiral Galaxy, an unusual characteristic shared only by two other black-hole binary systems, including Swift J1753.5–0127.

"These high galactic latitude locations and short orbital periods are signatures of a potential new class of binary system, objects that may have been kicked out of the Galactic plane during the explosive formation of the black hole itself," says Dr Kuulkers.

Returning to MAXI J1659−152, the quick response of XMM-Newton was key in being able to measure the remarkably short of the system.

"Observations started at tea-time, just five hours after we received the request to begin taking measurements, and continued until breakfast the next day. Without this rapid response it would not have been possible to discover the fastest rotation yet known for any binary system with a black hole," adds Norbert Schartel, ESA's XMM-Newton project scientist.

Explore further: Cygnus X-1: Still a 'Star' After All Those Years

More information: "MAXI J1659−152: The shortest orbital period black-hole transient in outburst," by E. Kuulkers et al. is published in Astronomy & Astrophysics, 552, A32 (2013).

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10 comments

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The Singularity
2.1 / 5 (7) Mar 19, 2013
Interesting article, although wouldnt 2 million k be better expressed in c.
VENDItardE
2.7 / 5 (7) Mar 19, 2013
as in 0.0016 c ?
VendicarE
1 / 5 (7) Mar 20, 2013
"expressed in c" - Singularty

Given that c is a rate of change of distance, you can't specify distance as a rate of change of distance.

At best you have to specify a time interval.

"as in 0.0016 c ?" - UbVonTard

Tards are what Tard's do.
Fleetfoot
5 / 5 (9) Mar 20, 2013
"expressed in c" - Singularty

Given that c is a rate of change of distance, you can't specify distance as a rate of change of distance.

At best you have to specify a time interval.

"as in 0.0016 c ?" - UbVonTard

Tards are what Tard's do.


"two million kilometres per hour" is not a distance. Reading the article before responding is advisable.
Fleetfoot
5 / 5 (4) Mar 20, 2013
nkalanaga
5 / 5 (1) Mar 20, 2013
"c" is simply the speed of light, in whatever units of speed one prefers. It has nothing to do with distance traveled unless one specifies a time, anymore than saying a car is traveling 100 km/hr tells how far it has traveled. In this case VENDItardE's usage is correct.
Fleetfoot
5 / 5 (4) Mar 20, 2013
"c" is simply the speed of light, in whatever units of speed one prefers. It has nothing to do with distance traveled unless one specifies a time, anymore than saying a car is traveling 100 km/hr tells how far it has traveled. In this case VENDItardE's usage is correct.


There was a typo in the original comment, it should have been "km/h" but was typed as just "k". The value in the article was clearly a speed, not a distance. The criticism was unjustified.
grosyhpgrosyhpgrosyhp
5 / 5 (1) Mar 20, 2013
should be a good target for a gravitational waves research
Fleetfoot
not rated yet Mar 20, 2013
should be a good target for a gravitational waves research


Yes but not with LIGO. The orbital period is 2.4 hours, LIGO becomes sensitive above about a hundred orbits per second.
Fleetfoot
not rated yet Mar 21, 2013
I just watched the video and it seems to be backwards. Material drawn from the companion falling inwards would increase its orbital speed so move ahead of star, accelerating to catch up with the outer edge of the disc, but the video shows the inflow material trailing behind.

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