Posted on 11/05/2007 11:18:05 AM PST by Red Badger
Not only has a large chunk of the universe thought to have been found in 2002 apparently gone missing again but it is taking some friends with it, according to new research at The University of Alabama in Huntsville (UAH). The new calculations might leave the mass of the universe as much as ten to 20 percent lighter than previously calculated.
The same UAH group that found what was theorized to be a significant fraction of the "missing mass" that binds together the universe has discovered that some x-rays thought to come from intergalactic clouds of "warm" gas are instead probably caused by lightweight electrons.
If the source of so much x-ray energy is tiny electrons instead of hefty atoms, it is as if billions of lights thought to come from billions of aircraft carriers were found instead to come from billions of extremely bright fireflies.
"This means the mass of these x-ray emitting clouds is much less than we initially thought it was," said Dr. Max Bonamente, an assistant professor inUAH's Physics Department. "A significant portion of what we thought was missing mass turns out to be these 'relativistic' electrons."Traveling at almost the speed of light (and therefore "relativistic"), these feather weight electrons collide with photons from the cosmic microwave background. Energy from the collisions converts the photons from low-energy microwaves to high-energy x-rays.
"The discovery was made while trying to analyze the makeup of warm, x-ray emitting gas at the center of galaxy clusters - the largest cosmological structures in the universe. In 2002 the UAH team reported finding large amounts of extra "soft" (relatively low-energy) x-rays coming from the vast space in the middle of galaxy clusters. This was in addition to previously-discovered "hot" gas in that space, which emits higher energy"hard" x-rays.
Although the soft x-ray-emitting atoms were thought to be spread thinly through space (less than one atom per cubit meter), they would have filled billions of billions of cubic light years. Their cumulative mass was though tto account for as much as ten percent of the mass and gravity needed to hold together galaxies, galaxy clusters and perhaps the universe itself.
When Bonamente and his associates looked at data gathered by several satellite instruments, including the Chandra X-ray Observatory, from a galaxy cluster in the southern sky, however, they found that energy from those additional soft x-rays doesn't look like it should."We have never been able to detect spectral emission lines associated with those detections," he explained. "If this 'bump' in the data were due to cooler gas, it would have emission lines.
"The best, most logical explanation seems to be that a large fraction of the energy comes from electrons smashing into photons instead of from warm atoms and ions, which would have recognizable spectral emission lines.Finding these electrons, however, is like finding "the tip of the iceberg,"said Bonamente, because they would not be limited to emitting only the soft x-ray signal. The signal from these electrons would also make up part of the previously observed harder X-rays, which would reduce the amount of mass thought to make up the hot gas at the center of galaxy clusters.
To further complicate the issue, the energy from these electrons might also"puff up" the cluster. Previously, astrophysicists used the energy coming from inside these clusters to calculate how much mass is needed to reach the equilibrium seen there; too much mass and the cloud would collapse; too little and the hot gas cloud would expand.Since the energy coming from these hot clouds can be accurately measured, it was thought the mass could be calculated with reasonable confidence - for astrophysics.Instead, says Bonamente, if a significant portion of the total x-ray energy comes from fast electrons, "that could trick us into thinking there is more gas than is actually there.""It means we need to revise how we calculate both the gas mass and the total mass," he said. "We have to follow the evidence and, if that leads us to confusion, well that's OK."If part of the hard x-ray energy comes from electrons and photons, it might also shift what we think is the mix of elements in the universe.
Outside of the excess soft x-rays, the x-ray energy coming from galaxy clusters has emission lines which are especially prominent around iron and other metals.Non-thermal x-rays from electrons colliding with photons might mask those emission lines, like thick snow can mask the height of fence posts."This is also telling us there is fractionally more iron and other metals than we previously thought," said Bonamente. "Less mass but more metals."
Results of this research by Bonamente, Jukka Nevalainen of Finland'sHelsinki Observatory and UAH's Dr. Richard Lieu were published Oct. 20 in the "Astrophysical Journal.
Adapted from materials provided by University Of Alabama In Huntsville.
Amen!
Your photo talent is EVER EXPANDING I tell ya!
Great work !!!
Thank you Meek, hope you saw my latest of Hillary at the debate, lol.
The “Eye Of God” I made for devolve this past year. Told him it was the hand of God reaching for his hand. Just a whimsy on my part.
Whoops. Another gap.
The new calculations might leave the mass of the universe as much as ten to 20 percent lighter than previously calculated.Looking down where my lap used to be, I think I know what happened to it.
Look under your bed.
No? Fine. And don’t think we’re going to rush right out and buy you a new one. If you can’t keep up with your universes, we’re going to have to take away the rest of them, and give them to a good scientist who won’t just throw them around...
Sometime next year, when we mow the pasture, we’ll find it where the dog dragged it off and chewed it. Then you’ll wish you had paid more attention to where you were left your big chunks of universe!
Not me. Shoes and clothes shopping bore me to tears.
I'd rather go to an NFL game and second-guess the coaches, or to the nieghborhood bar to play trivia than to get anywhere near a mall.
I make myself presentable when I go out, but shopping is a necessary chore that I can get done rather expeditiously. I won't go shopping with my female friends; they take way too long. ;-)
Is that the Donut Hole?
And God just chuckles......
Hmmmmmm ... I don't recall if I did or not.
Of course, I've slept since then, too, soooo ....
:)
Rut-Roh, Reorge!
The DREDDED RED X !!!! :^O
I am just what my name says a biker chick. I am soooooooo NOT a shoe collector. Who needs all those shoes anyway?
Have they searched Jenny Craig's?
Bull, you're still mad because you couldn't sell Elvis on Ebay.
I coulda....I just didn’t gotta.
Maybe the Universe has been doing some exercises...........
Whatever you do, don't pin two matching socks together before you wash them. Then they both disappear, and you don't even have one sock left.
Ha ha ha.....I am the reason they wrote Murphy's Law, I have no luck and dumb things happen to me.
So if I pinned them together, I would end up with no socks...and a painful moment of dressing in the morning by finding the pin stuck in my underwear.
;-)
Thanks for the ping!
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