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Hypernova Erupts as Global Telescopes Scramble
An anonymous reader writes "The remarkable Robotic Optical Transient Search Experiment [ROTSE] telescopes have tracked a 2 billion year old hypernova, from which an intense gamma ray burst reached earth on March 29. From Carl Akerlof, the ROTSE investigator: "The optical brightness of this gamma ray burst is about 100 times more intense than anything we've ever seen before." To underscore how the sun never rises on this automated telescope network, the observations switched rapidly from New South Wales in Australia back to Fort Davis, Texas, over a 12 hour burnout of the collapsing black hole."
Hide in your basesment and get out your tinfoil hat! ...I'm glad to see many of you are already prepared.
And it was just about to retire the next day. 2 billion years of loyal service as a hypernova, and it erupts just like that.
Quoted a co-worker, "It's what we call in the nova business retirony."
-Look lively. LOOK LIVELY!!! --Mr. Shmallow
Sig.i>
Just wondering, is a giganova 1024 or 1000 times stronger than a meganova :-)
Rest in peace Malin "looxn" Kristiansen. We miss you...
_________
cheap web site hosting - now with extra donuts.
This happened 2 Billion years ago.
Slow news day?
From Carl Akerlof, the ROTSE investigator: "The optical brightness of this gamma ray burst is about 100 times more intense than anything we've ever seen before."
And five minutes later, after someone accidentally spilled coffee on Dr. Akerlof, angering him, he was quoted as saying... wait for it... wait for it... all together now...
HULK SMASH!!!
Let the painfully immature gamma ray jokes begin.
Let's just hope we don't get one of these anywhere much closer than this, cause otherwise everyone will have a really good sun tan very fast!
Daniel
Carpe Diem
** KARMA WHORE MODE: OFF **
Hypernova Blast:
Global Chase Ensues
based on U. Michigan release
Two billion years ago, in a far-away galaxy, a giant star exploded, releasing almost unbelievable amounts of energy as it collapsed to a black hole. The light from that explosion finally reached Earth at 6:37 a.m. EST on March 29, igniting a frenzy of activity among astronomers worldwide. This phenomenon has been called a hypernova, playing on the name of the supernova events that mark the violent end of massive stars.
With two telescopes separated by about 110 degrees longitude, the Robotic Optical Transient Search Experiment (ROTSE) will have one of the most continuous records of this explosion.
The changing intensity of a gamma-ray burst. On the left is an image of the gamma ray sky showing the burst becoming the brightest object. On the right is a plot of the changing brightness with time. The first gamma-ray burst was seen in the year 1967 (although it was not reported to the world until 1973) by satellite-borne detectors intended to look for violations of the Nuclear Test Ban Treaty. Credit: BATSE
"The optical brightness of this gamma ray burst is about 100 times more intense than anything we've ever seen before. It's also much closer to us than all other observed bursts so we can study it in considerably more detail," said Carl W. Akerlof, an astrophysicist in the Physics Department at the University of Michigan.
Contrary to visible light, gamma rays are non-thermal meaning that they are not produced in hot celestial bodies like the sun. Gamma rays occur in exceptional circumstances such as in the aftermath of a stellar explosion, in the vicinity of black holes, or at the core of active galaxies.
Just recently, the ROTSE group commissioned two optical telescopes in Australia and Texas and were waiting for the first opportunities to use the new equipment. The burst was promptly detected by NASA's Earth orbiting High-Energy Transient Explorer (HETE-2) but human intervention was required to find the exact location.
Despite sporadic clouds and rainstorms in Australia, the ROTSE instrument at Siding Spring Observatory in northern New South Wales was able to record the decaying light from the blast. Twelve hours later, the second ROTSE telescope in Fort Davis, Texas was picking up the job of monitoring this spectacular explosion.
"During the first minute after the explosion it emitted energy at a rate more than a million times the combined output of all the stars in the Milky Way. If you concentrated all the energy that the sun will put out over its entire 9 billion-year life into a tenth of a second, then you would have some idea of the brightness," said Michael Ashley, faculty member in the astrophysics and optics department at the University of New South Wales and a member of the ROTSE team.
Given that the history of astronomy goes back centuries, observations in the gamma spectrum are really among the newest areas in celestial research. The high-energy light is swallowed by the earth's atmosphere yet the light cannot be captured with conventional lenses or mirrors. Special detectors in satellites and high altitude research rockets register gamma rays with energies of up to around ten billion electron volts.
Gamma rays occur in exceptional circumstances such as in the aftermath of a stellar explosion, in the vicinity of black holes, or at the core of active galaxies. Credit: NASA
Fortunately for life on earth, a gamma particle from the universe does not penetrate to the earth's surface, but if it flies past an atomic nucleus within the earth's atmosphere, the gamma particle can transform itself into an electron and its (positive) antiparticle, a positron. During its journey through the air, this pair comes across more atomic nuclei and a gamma quantum is generated which then once again hits atomic nuclei. Thus, a single cosmic gamma particle creates roughly a thousand secondar
"To underscore how the sun never rises on this automated telescope network, the observations switched rapidly from New South Wales in Australia back to Fort Davis, Texas..."
yeah, but if it were september would we even know it happened?
IANAA but, it seems that even if you always have someone looking into the night sky, it's only half of the sky - you cant see the side where the sun is untill later in the year.
now if we could somehow drop a satellite telescope behind in orbit around the sun about 6 months behind us and another 3 months behind (for line of sight comms) we could get a more complete picture of our neiborhood year round.
or...i could be completly ignorant.
The first of the four images from hubble of the event is about 2 light years across I figure the last of the 4 images they say is 6 light years across.
Problem is this only happened in March so how did it expand 4 light years in like a few months and how exactly did that expansion happen when some how the burst just reached us over that distance.
Anyone see a problem here? It expands 4 light years in size in just a few months yet some how the light manages to travel 2 billion light years.
I can't see how this could have happened, Iv'e been thinking about it since it was posted as APOD picture of the day a few days ago.
Expansion faster then the speed of light? It don't make sence to me.
"If you concentrated all the energy that the sun will put out over its entire 9 billion-year life into a tenth of a second, then you would have some idea of the brightness."
The key phrase here is then you would have some idea. Frankly, there is a point in astronomy and astrophysics where things get so big, and so fast, and so bright, that the only idea that remains in one's brain when trying to imagine such phenomena is a white light with a big hand reaching into it. The example above is classic: first I have to imagine 9 billion years (good luck, I can't even remember what happened yesterday) and then I have to imagine a tenth of a second, which is like a total brain fart. And then, and only then, would I have some idea of the brightness. Well, I guess that I would have some idea if my head hadn't imploded while trying to imagine that nanofart called a "tenth of a second." Geezus.
The Death Penalty: Killing people to show others that killing people is wrong.
Fortunately, they didn't call their telescope network the Global Optical Automatic Transient Search Experiment, whose headquarter are in the Christmas Islands.
"Two billion years ago, in a far-away galaxy, a giant star exploded."
The death of star. Death Star.
I predict they might be seeing a second one of these explosions any time soon...
Would it increase your changes of getting cancer? Shields that reduce gamma ray intensity by 50% include 1cm (0.4 inches) of lead, 6cm (2.4 inches) of concrete or 9cm (3.6 inches) of packed dirt. On the good side, gamma radiation is only as harmful as x-ray or beta particles. This NASA site however says that most gamma radiation is absorbed by the atmosphere, which is why you need balloons or sattelites to really see gamma rays.
http://www.santacruzbynight.com/index.shtml Santa Cruz By Night Vampire Larp
'Contrary to visible light, gamma rays are non-thermal meaning that they are not produced in hot celestial bodies like the sun. Gamma rays occur in exceptional circumstances such as in the aftermath of a stellar explosion, in the vicinity of black holes, or at the core of active galaxies'
This is of course not true - gamma rays are produced in many places, among other things by Radium, if my memory serves me. And the Sun does indeed produce gamma rays are essentially just high energy photons, just like visible light (and radio waves, for that matter) with 'high energy'. Electromagnetic radiation is quantified in 'packets' called photons, and it is mostly a metter of taste whether you call them radio waves, microwaves, light, X-rays or gamma rays. There's an upper for gamma photons by the way (sort of): a photon with very high energy will tend to 'split' and form a pair consisting of an electron and a positron, which then annihilate in a burst of photons.
"The optical brightness of this gamma ray burst is about 100 times more intense than anything we've ever seen before."
Aren't gamma rays by definition not optical (i.e. not in the visible spectrum)?
the coolest club on
There are absolutely massive numbers involved that it's difficult to realistically comprehend them let alone compare them meaningfully.
Co-incidentally, I worked out for someone tonight that if the Sun and the Earth were 5 centimetres apart (that's a couple of inches), then the Andromeda galaxy would be roughly 6.7 million kilometres down the road. (About 4 million miles.) And Andromeda's one of the closest of what was most recently estimated to be around 80 billion galaxies.
Rotse. I swear every and any word/acronym/setofcharacters containing o*tse or some form of it has, in my mind, been ruined forever. My first day at slashdot will continue haunt me to the end of my days.
Thank you.
Note: This sig contains nine S's, nine I's and five O's which... means absolutely nothing.