Science > Physics > sound waves rumbling away from a supermassive black hole
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Science > Physics |
| User: |
"Sam Wormley" |
| Date: |
10 Sep 2003 05:48:04 AM |
| Object: |
sound waves rumbling away from a supermassive black hole |
NASA Science News for September 9, 2003
Astronomers using NASA's Chandra X-ray Observatory have detected, for the
first time, sound waves rumbling away from a supermassive black hole. The
"note," about 57 octaves lower than middle-C, is the deepest ever detected
from an object in our Universe.
FULL STORY at
http://science.nasa.gov/headlines/y2003/09sep_blackholesounds.htm?list768530
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| User: "Randy Poe" |
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| Title: Re: sound waves rumbling away from a supermassive black hole |
10 Sep 2003 08:45:00 AM |
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Sam Wormley <swormley1@mchsi.com> wrote in message news:<3F5F015D.B4C09993@mchsi.com>...
NASA Science News for September 9, 2003
Astronomers using NASA's Chandra X-ray Observatory have detected, for the
first time, sound waves rumbling away from a supermassive black hole. The
"note," about 57 octaves lower than middle-C, is the deepest ever detected
from an object in our Universe.
FULL STORY at
http://science.nasa.gov/headlines/y2003/09sep_blackholesounds.htm?list768530
I heard that on the radio last night. Fascinating stuff.
Questions that come to mind:
What's the density of the gas in which these pressure
waves are propagating? Or maybe the question is, what
is the maximum density and minimum density? It's hard
to imagine a coherent pressure wave without significant
maximum pressure.
What periodic phenomenon in the black hole causes this?
Stories are quoting the frequency as "57 octaves below
the b-flat below middle C". I make that to be
246.94 Hz * 2^(-57), or 1.7135*10^-15 Hz, or a period
of 5.836*10^14 seconds, or 18.5 million years.
- Randy
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| User: "nightbat" |
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| Title: Re: sound waves rumbling away from a supermassive black hole |
10 Sep 2003 02:37:15 PM |
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nightbat wrote
Randy Poe wrote:
Sam Wormley <swormley1@mchsi.com> wrote in message news:<3F5F015D.B4C09993@mchsi.com>...
NASA Science News for September 9, 2003
Astronomers using NASA's Chandra X-ray Observatory have detected, for the
first time, sound waves rumbling away from a supermassive black hole. The
"note," about 57 octaves lower than middle-C, is the deepest ever detected
from an object in our Universe.
FULL STORY at
http://science.nasa.gov/headlines/y2003/09sep_blackholesounds.htm?list768530
I heard that on the radio last night. Fascinating stuff.
Questions that come to mind:
What's the density of the gas in which these pressure
waves are propagating? Or maybe the question is, what
is the maximum density and minimum density? It's hard
to imagine a coherent pressure wave without significant
maximum pressure.
What periodic phenomenon in the black hole causes this?
Stories are quoting the frequency as "57 octaves below
the b-flat below middle C". I make that to be
246.94 Hz * 2^(-57), or 1.7135*10^-15 Hz, or a period
of 5.836*10^14 seconds, or 18.5 million years.
- Randy
nightbat
No, no Randy, just Elvis in heaven having some fun. Humans can't
hear normally at that level, but ghost busters have low octave high tech
listening devices that can supposedly pickup graveyard voice sounds from
the unknown. Astro physicists may be applying this black hole alien
multiworld Tesla radio principle to deep space applications and
investigations. According to Smart's anointed futuristic exacting
pronouncements, a second anti matter parallel universe already exists so
it would follow, if Elvis made it, he's just doing his normal thing.
the nightbat
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| User: "Jim" |
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| Title: Re: sound waves rumbling away from a supermassive black hole |
12 Sep 2003 07:50:10 PM |
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Sam Wormley <swormley1@mchsi.com> wrote:
NASA Science News for September 9, 2003
Astronomers using NASA's Chandra X-ray Observatory have detected, for the
first time, sound waves rumbling away from a supermassive black hole. The
"note," about 57 octaves lower than middle-C, is the deepest ever detected
from an object in our Universe.
FULL STORY at
http://science.nasa.gov/headlines/y2003/09sep_blackholesounds.htm?list768530
The foot pedals on my B3 don't even go that low! :)
Jim
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| User: "Bob Cain" |
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| Title: Re: sound waves rumbling away from a supermassive black hole |
10 Sep 2003 06:57:12 PM |
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Sam Wormley wrote:
NASA Science News for September 9, 2003
Astronomers using NASA's Chandra X-ray Observatory have detected, for the
first time, sound waves rumbling away from a supermassive black hole. The
"note," about 57 octaves lower than middle-C, is the deepest ever detected
from an object in our Universe.
FULL STORY at
http://science.nasa.gov/headlines/y2003/09sep_blackholesounds.htm?list768530
Could this actually be an acoustic wave phenomenon or is it
just density striations that are moving inertially? I have
a hard time believing that at the density of intergalactic
gas there could be enough coupling between the molecules for
there to be what could be called a pressure or the pressure
differential needed to make it "sound."
Thanks,
Bob
--
"Things should be described as simply as possible, but no
simpler."
A. Einstein
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| User: "Sam Wormley" |
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| Title: Re: sound waves rumbling away from a supermassive black hole |
12 Sep 2003 07:14:39 AM |
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Sam Wormley wrote:
NASA Science News for September 9, 2003
Astronomers using NASA's Chandra X-ray Observatory have detected, for the
first time, sound waves rumbling away from a supermassive black hole. The
"note," about 57 octaves lower than middle-C, is the deepest ever detected
from an object in our Universe.
FULL STORY at
http://science.nasa.gov/headlines/y2003/09sep_blackholesounds.htm?list768530
More: http://antwrp.gsfc.nasa.gov/apod/ap030912.html
http://antwrp.gsfc.nasa.gov/apod/image/0309/perseus_cxc2pan_full.jpg
A truly enormous collection of thousands of galaxies, the Perseus
Cluster - like other large galaxy clusters - is filled with hot, x-ray
emitting gas. The x-ray hot gas (not the individual galaxies) appears
in the left panel above, a false color image from the Chandra
Observatory. The bright central source flanked by two dark cavities is
the cluster's supermassive black hole. At right, the panel shows the
x-ray image data specially processed to enhance contrasts and reveals a
strikingly regular pattern of pressure waves rippling through the hot
gas. In other words, sound waves, likely generated by bursts of
activity from the black hole, are ringing through the Perseus Galaxy
Cluster. Astronomers infer that these previously unknown sound waves
are a source of energy which keeps the cluster gas so hot. So what note
is the Perseus Cluster playing? Estimates of the distance between the
wave peaks and sound speed in the cluster gas suggests the cosmic note
is about 57 octaves below B-flat above middle C.
See: http://antwrp.gsfc.nasa.gov/apod/ap030912.html
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| User: "tj Frazir" |
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| Title: Re: sound waves rumbling away from a supermassive black hole |
12 Sep 2003 12:54:03 PM |
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Its plazma not gas.
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| User: "tj Frazir" |
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| Title: Re: sound waves rumbling away from a supermassive black hole |
10 Sep 2003 07:32:13 PM |
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excelent dude
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