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Black Holes' Vast Power Is Documented
NY TIMES ^ | February 19, 2004 | JOHN NOBLE WILFORD

Posted on 02/18/2004 11:53:51 PM PST by neverdem

New X-ray observations by orbiting satellites have given astronomers their first telling evidence that appears to confirm what had been only theory: that a star is doomed if it ventures too close to a supermassive black hole.

The National Aeronautics and Space Administration and the European Space Agency announced yesterday the detection of a brilliant flare of X-rays from the heart of a distant galaxy, followed by a fading afterglow.

After analysis, an international team of scientists concluded that the telescopes had witnessed the overpowering gravity of a black hole as it tore apart a star and gobbled up a hearty share of its gaseous mass.

It was an act of cosmic mayhem known as a stellar tidal disruption. It removed any lingering doubt, astronomers said, that the reputation of black holes as star-destroyers is fully deserved.

"Stars can survive being stretched a small amount, but this star was stretched beyond its breaking point," said Stefanie Komossa of the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, who led the discovery team. "This unlucky star just wandered into the wrong neighborhood."

Astronomers said they suspected that the ill-fated star was thrown off course by a close encounter with another star. Then it fell under the gravitational influence of a black hole and its enormous tidal forces, nothing so benign as the Moon's tug on Earth's oceans. The black hole, in effect, reached out and squeezed and stretched the star until it disintegrated.

In a televised news briefing at NASA in Washington, Günther Hasinger, also an astrophysicist at the Max Planck Institute, said, "For the first time, we really are convinced that we are seeing a star being ripped apart by a black hole."

Alex Filippenko, an astronomy professor at the University of California, Berkeley, who was not involved in the research, agreed.

"This is really fantastic," Dr. Filippenko said. "This is very strong evidence that stars are being ripped apart by supermassive black holes."

The astronomers estimated that about 1 percent of the victimized star's mass was consumed by the black hole. This small amount, they said, was consistent with theoretical predictions that the momentum and energy of star-destruction process would cause most of the star's gas to be flung away from the black hole.

The initial outburst of high-energy radiation was detected in 1992 by the German Rosat X-ray spacecraft, but the observations were fuzzy. At the time, puzzled scientists could only speculate about the nature of the flare or its origin.

The more definitive observations were made three years ago by two orbiting X-ray telescopes, NASA's Chandra and the European XMM-Newton satellites. They determined that the X-rays were coming from the center of a galaxy, RX J1242-11. The most awesome black holes, with densely packed masses equivalent to millions or billions of Suns, are found at galactic cores. This one is estimated to have a mass of about 100 million Suns.

More detailed examinations of the energy spectrum of the X-rays by the European satellite, astronomers said, revealed physical conditions similar to the expected surroundings of black holes, ruling out other possible astronomical explanations. The energy liberated by the tidal disruption was reported to be equivalent to that of a supernova, an exploding star.

Dr. Filippenko said the findings should advance understanding of black holes and provide a critical framework for theoretical models of how they grow and evolve over time.

Black holes cannot be observed directly; their gravity is so strong that nothing, not even light, can escape their clutches. What is known about black holes is mostly deduced from observations of the whirlpool motions of gas and dust and stars under their gravitational influence.

The X-ray discovery may give scientists another means of identifying the presence of black holes and learning more about their behavior.

Kim Weaver, an astrophysicist at NASA's Goddard Space Flight Center in Greenbelt, Md., said the high-energy flares of a star's disintegration by black-hole gravity could serve as flashlights to illuminate the otherwise obscuring gas and dust and to provide glimpses into the inner regions of galaxies.

The astronomers gave assurances that the Sun is far enough away from a suspected black hole at the center of the Milky Way galaxy to be well out of danger.


TOPICS: Extended News; Germany; Government; Miscellaneous; US: California; US: District of Columbia; US: Maryland
KEYWORDS: astronomy; blackholes; nasa; physics; science; techindex; xrayastronomy
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1 posted on 02/18/2004 11:53:51 PM PST by neverdem
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To: neverdem
After analysis, an international team of scientists concluded that the telescopes had witnessed the overpowering gravity of a black hole as it tore apart a star and gobbled up a hearty share of its gaseous mass.

Why didn't it swallow the whole star? Not hungry enough?

2 posted on 02/18/2004 11:58:54 PM PST by HiTech RedNeck
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To: fourdeuce82d; Travis McGee; El Gato; JudyB1938; Ernest_at_the_Beach; Robert A. Cook, PE; lepton; ...
PING
3 posted on 02/19/2004 12:01:26 AM PST by neverdem (Xin loi min oi)
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To: js1138
Dirty atheists at work ;)
4 posted on 02/19/2004 12:02:21 AM PST by general_re (Remember that what's inside of you doesn't matter because nobody can see it.)
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To: general_re
Another time, another place.
5 posted on 02/19/2004 12:04:42 AM PST by js1138
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To: HiTech RedNeck
Maybe it's on the Atkins plan.
6 posted on 02/19/2004 12:06:39 AM PST by Mad_Tom_Rackham (Any day you wake up is a good day.)
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To: js1138
It was inevitable...
7 posted on 02/19/2004 12:06:54 AM PST by general_re (Remember that what's inside of you doesn't matter because nobody can see it.)
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To: general_re
I like the "Kennedy at the Berlin Wall". Interesting that The Onion would make fun of one of Kennedy's better moments. Obviously provocative statements like his alienated our allies and made the world less safe.
8 posted on 02/19/2004 12:10:28 AM PST by js1138
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To: js1138
Spitting on icons is more or less their raison d'etre ;)
9 posted on 02/19/2004 12:15:48 AM PST by general_re (Remember that what's inside of you doesn't matter because nobody can see it.)
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To: general_re
LOL, thanks for the laughing link.
10 posted on 02/19/2004 12:30:36 AM PST by neverdem (Xin loi min oi)
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To: Mad_Tom_Rackham
Maybe it's on the Atkins plan.

Would that be the low-carb(on) diet?

The astronomers gave assurances that the Sun is far enough away from a suspected black hole at the center of the Milky Way galaxy to be well out of danger.

Well, gee, I'm relieved! I was worried for a while there!

11 posted on 02/19/2004 12:34:15 AM PST by Clock King
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To: neverdem

12 posted on 02/19/2004 7:53:38 AM PST by RightWingAtheist
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To: general_re
I've read a long time ago (Scientific American, I think) that scientists as a group are about as religious as the rest of the population. On the other hand, if you look at college religion professors and students, only about 10% are religious.

I thought that was funny. :p
13 posted on 02/19/2004 8:00:54 AM PST by Constantine XIII
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To: general_re

The Phenomenon of Red Shift

Even today, the stars and galaxies continue to fly apart. This produces a phenomenon called red shift. The further away a celestial object is, the more it appears to astronomers on Earth to be shifted toward the red end of the spectrum.

Red shift shows increasing totalitarian domination of the outer reaches of the universe. Write your congressman!

Courtesy of "Science Made Stupid"

http://www.besse.at/sms/smsintro.html

14 posted on 02/19/2004 8:04:18 AM PST by Constantine XIII
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To: Constantine XIII; neverdem
Red shift shows increasing totalitarian domination of the outer reaches of the universe.

I like it. ;)

I guess I should explain - last night, just before js and I posted here, there was a vanity thread (which was pretty quickly pulled) that argued that the super-duper top-secret real mission of NASA was actually to advance atheism and Marxism by making it really really hard for people to believe in God. So after a bit of appropriate mocking, that thread got yanked, and I just happened to see this thread right there afterwards. So that's the reason you got the strange comments ;)

15 posted on 02/19/2004 9:42:08 AM PST by general_re (Ubi solitudinem faciunt, pacem appellant. - Tacitus)
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To: general_re
I never did understand how people can think NASA, of all the various government agencies, is the most evil. :-P
16 posted on 02/19/2004 10:30:51 AM PST by Constantine XIII
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To: neverdem
....brilliant flare of X-rays from the heart of a distant galaxy, followed by a fading afterglow.

A bit like the bedroom scene in "To Catch a Thief."

17 posted on 02/19/2004 10:43:43 AM PST by Doctor Stochastic (Vegetabilisch = chaotisch is der Charakter der Modernen. - Friedrich Schlegel)
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To: neverdem; stanz; christie
The black hole, in effect, reached out and squeezed and stretched the star until it disintegrated.

Kind of what happens to people who get too close to Bill and Hillary!.

18 posted on 02/19/2004 11:05:16 AM PST by jellybean (Taglines are easy...it's filling in the reply box that takes thought.)
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To: jellybean
LOL
19 posted on 02/19/2004 1:38:07 PM PST by neverdem (Xin loi min oi)
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To: neverdem; RadioAstronomer
These stories always make it seem like they are really close together. I guess they are in the cosmic sense.
20 posted on 02/19/2004 1:41:21 PM PST by farmfriend ( Isaiah 55:10,11)
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