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An extraordinary cluster of faraway galaxies is shattering or challenging a number of cosmic records, weighing in as potentially the most massive cluster known. The colossal galaxy cluster is also the brightest in X-ray light, and the galaxy at its heart apparently gives birth to more than 700 stars per year – hundreds of times as fast as our Milky Way forms stars, researchers say. The cluster of galaxies, located about 7 billion light-years away, is formally known by the alphabet-soup name of SPT-CLJ2344-4243. Astronomers also have given it a more informal moniker: the Phoenix cluster, named after the constellation in which it resides. It appears to contain thousands of galaxies with a range of sizes, from dwarf galaxies to conglomerations of stars about the size of the Milky Way. Scientists added that this record-breaking galaxy cluster may help solve a decades-old puzzle about how slowly such clusters cool. [7 Surprising Things About the Universe] Most massive ever? The Phoenix cluster is extraordinarily massive: about 2,000 times the apparent mass of the Milky Way, or 2.5 quadrillion times the mass of the sun. "I would say it's in a dead heat for the most massive galaxy cluster," study lead author Michael McDonald, an astronomer at the Massachusetts Institute of Technology, told SPACE.com. "The record holder, 'El Gordo,' is slightly more massive, but the uncertainty in this estimate is high — it could turn out that with more careful measurements, Phoenix is more massive." The Phoenix cluster was initially discovered in 2010 by the South Pole Telescope. "We didn't realize how exciting it was until summer of 2011, when we obtained follow-up X-ray data from the Chandra X-ray Observatory," McDonald said. "These observations immediately revealed the extreme X-ray brightness of this galaxy cluster." Indeed, the Phoenix cluster is the most X-ray luminous galaxy cluster found yet, about 35 percent brighter than the previous record holder. All the X-rays it sheds suggest the Phoenix cluster is also the fastest-cooling cluster yet known, since cooling of hot gas in the cluster is what is thought to produce the X-rays. "My first thought was that if there's that much cooling going on, there should be stars forming," McDonald said. As such, using the Gemini telescope, "we found evidence for a tremendous amount of star formation." Star formation Researchers say the central galaxy in the Phoenix cluster is apparently forming a whopping 740 stars per year, based on images acquired from 10 different telescopes in space and on the ground around the world that observed the cluster at a variety of wavelengths. The previous record holder was Abell1835, a galaxy that forms about 100 stars per year. "If you look at normal galaxy clusters, the central, most massive galaxy is typically forming stars at a rate of one new star every few years," McDonald said. "It's a huge difference." The central massive galaxies are essentially the first to form within such clusters. Being billions of years old, they are expected to have been dormant a very long time. That makes this "starburst" activity seen in the Phoenix cluster's central galaxy even more extraordinary. "Central galaxies have typically been referred to as 'red and dead' — just a bunch of old stars orbiting a massive black hole, and there's nothing new happening," McDonald said. "But the central galaxy in this cluster has somehow come to life and is giving birth to prodigious numbers of new stars." This colossal rate of star formation may shed new light on a decades-old conundrum regarding the evolution of galaxy clusters. Gas at the core of a cluster streaming from nearby galaxies and supernova explosions should naturally cool over time, forming a flow cold enough to condense and form new stars. However, scientists have long been at a loss to find any galaxy cluster that actually cools at the rates predicted. The cooling problem One explanation for this "cooling flow problem" may be that a cluster's natural cooling somehow gets interrupted. For instance, the supermassive black holes suspected to lurk at the centers of many of these clusters might emit jets of particles that reheat the core, preventing it from cooling entirely. "What's interesting about the Phoenix cluster is that we see such a large fraction of the cooling that was predicted," McDonald said. "It could be that this is earlier in the evolution where there's nothing stopping it, so it cools and becomes a starburst." In the future, "ideally we'd like to find more systems like this," McDonald said. "It's really difficult to draw meaningful conclusions based on a single system. "If we could find more systems like this one, it would imply that this is a normal phase of galaxy cluster evolution," he added. "To do this, we need deeper surveys that cover larger areas of the sky. We have the technology in place for this — we just need time and continued financial support." On the other hand, the Phoenix cluster may prove unique. If so, "we hope to get more detailed observations to answer questions such as, 'Why isn't the central black hole regulating this extreme cooling and the resulting star formation?' and, 'Is the starburst really being fueled by the cooling gas in the cluster core, or is it the result of something more exotic, like galaxy-galaxy mergers?'" McDonald said. The team's findings are detailed in the Aug. 16 issue of the journal Nature.
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An extraordinary cluster of faraway galaxies is shattering or challenging a number of cosmic records, weighing in as potentially the most massive cluster known. The colossal galaxy cluster is also the brightest in X-ray light, and the galaxy at its heart apparently gives birth to more than 700 stars per year – hundreds of times as fast as our Milky Way forms stars, researchers say. The cluster of galaxies, located about 7 billion light-years away, is formally known by the alphabet-soup name of SPT-CLJ2344-4243. Astronomers also have given it a more informal moniker: the Phoenix cluster, named after the constellation in which it resides. It appears to contain thousands of galaxies with a range of sizes, from dwarf galaxies to conglomerations of stars about the size of the Milky Way. Scientists added that this record-breaking galaxy cluster may help solve a decades-old puzzle about how slowly such clusters cool. [7 Surprising Things About the Universe] Most massive ever? The Phoenix cluster is extraordinarily massive: about 2,000 times the apparent mass of the Milky Way, or 2.5 quadrillion times the mass of the sun. "I would say it's in a dead heat for the most massive galaxy cluster," study lead author Michael McDonald, an astronomer at the Massachusetts Institute of Technology, told SPACE.com. "The record holder, 'El Gordo,' is slightly more massive, but the uncertainty in this estimate is high — it could turn out that with more careful measurements, Phoenix is more massive." The Phoenix cluster was initially discovered in 2010 by the South Pole Telescope. "We didn't realize how exciting it was until summer of 2011, when we obtained follow-up X-ray data from the Chandra X-ray Observatory," McDonald said. "These observations immediately revealed the extreme X-ray brightness of this galaxy cluster." Indeed, the Phoenix cluster is the most X-ray luminous galaxy cluster found yet, about 35 percent brighter than the previous record holder. All the X-rays it sheds suggest the Phoenix cluster is also the fastest-cooling cluster yet known, since cooling of hot gas in the cluster is what is thought to produce the X-rays. "My first thought was that if there's that much cooling going on, there should be stars forming," McDonald said. As such, using the Gemini telescope, "we found evidence for a tremendous amount of star formation." Star formation Researchers say the central galaxy in the Phoenix cluster is apparently forming a whopping 740 stars per year, based on images acquired from 10 different telescopes in space and on the ground around the world that observed the cluster at a variety of wavelengths. The previous record holder was Abell1835, a galaxy that forms about 100 stars per year. "If you look at normal galaxy clusters, the central, most massive galaxy is typically forming stars at a rate of one new star every few years," McDonald said. "It's a huge difference." The central massive galaxies are essentially the first to form within such clusters. Being billions of years old, they are expected to have been dormant a very long time. That makes this "starburst" activity seen in the Phoenix cluster's central galaxy even more extraordinary. "Central galaxies have typically been referred to as 'red and dead' — just a bunch of old stars orbiting a massive black hole, and there's nothing new happening," McDonald said. "But the central galaxy in this cluster has somehow come to life and is giving birth to prodigious numbers of new stars." This colossal rate of star formation may shed new light on a decades-old conundrum regarding the evolution of galaxy clusters. Gas at the core of a cluster streaming from nearby galaxies and supernova explosions should naturally cool over time, forming a flow cold enough to condense and form new stars. However, scientists have long been at a loss to find any galaxy cluster that actually cools at the rates predicted. The cooling problem One explanation for this "cooling flow problem" may be that a cluster's natural cooling somehow gets interrupted. For instance, the supermassive black holes suspected to lurk at the centers of many of these clusters might emit jets of particles that reheat the core, preventing it from cooling entirely. "What's interesting about the Phoenix cluster is that we see such a large fraction of the cooling that was predicted," McDonald said. "It could be that this is earlier in the evolution where there's nothing stopping it, so it cools and becomes a starburst." In the future, "ideally we'd like to find more systems like this," McDonald said. "It's really difficult to draw meaningful conclusions based on a single system. "If we could find more systems like this one, it would imply that this is a normal phase of galaxy cluster evolution," he added. "To do this, we need deeper surveys that cover larger areas of the sky. We have the technology in place for this — we just need time and continued financial support." On the other hand, the Phoenix cluster may prove unique. If so, "we hope to get more detailed observations to answer questions such as, 'Why isn't the central black hole regulating this extreme cooling and the resulting star formation?' and, 'Is the starburst really being fueled by the cooling gas in the cluster core, or is it the result of something more exotic, like galaxy-galaxy mergers?'" McDonald said. The team's findings are detailed in the Aug. 16 issue of the journal Nature. |
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Ganys: Subhanallahi!!!, So we get plenty muslim active users like this on Nairaland? Hmmm, Why una no dey reply those Bigots that thrashes islam unneccesarily whenever those Criminals called BokoHaram commit their evili understand Ųя point, but i follow my dad's world say " Don't allow the opinion of one fool to alter who you are" S̤̥̈̊☺̴̩̩̥ let them say whatever they like. Alquran say And it is all the same for them whether you warn them or do not warn them - they will not believe. |
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Barack Obama's birth certificate is fake, fraudulent - US State Sheriff 18/07/2012 12:41:00Ascology Publishing Font size: (AP) - Investigators for an Arizona sheriff's volunteer posse have declared that President Barack Obama's birth certificate is definitely fraudulent. Members of Maricopa County Sheriff Joe Arpaio's posse said in March that there was probable cause that Obama's long-form birth certificate released by the White House in April 2011 was a computer-generated forgery. Now, Arpaio says investigators are positive it's fraudulent. Mike Zullo, the posse's chief investigator, said numeric codes on certain parts of the birth certificate indicate that those parts weren't filled out, yet those sections asking for the race of Obama's father and his field of work or study were completed. Zullo said investigators previously didn't know the meaning of codes but they were explained by a 95-year-old former state worker who signed the president's birth certificate. Zullo said a writer who published a book about Obama's birth certificate and was aiding investigators let them listen in on an interview he conducted of the former state worker. The Obama campaign declined to comment on Arpaio's allegations. The Arizona Democratic Party said in a statement that Arpaio's investigation is intended to draw attention away from problems within his own agency, such as hundreds of sex-crime cases that the sheriff's office failed to adequately investigate over a three-year period. So-called "birthers" maintain Obama is ineligible to be president because, they contend, he was born in Kenya. Hawaii officials have repeatedly confirmed Obama's citizenship, and state officials did again Tuesday. "President Obama was born in Honolulu and his birth certificate is valid," Joshua A. Wisch, a special assistant to Hawaii's attorney general, said in a statement. "Regarding the latest allegations from a sheriff in Arizona, they are untrue, misinformed, and misconstrue Hawaii law." Wisch also said that "not only are Hawaii's vital records some of the best managed, but they also have some of the strongest restrictions on access to prevent identity theft and fraud." Obama released a copy of his long-form birth certificate in an attempt to quell citizenship questions. Courts have rebuffed lawsuits over the issue. |
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If u really want to start the memory card business micro sd in nigeria here, b/4 we used to take them to computer village and saka tinubu to sell it but now due to the way they delay our money we deside to be selling them to eny buyer who ready to pay us in time. Here is the price list: 1gb: 450 2gb: 570 4gb: 800 8gb: 1100 16gb 3000 32gb 4800 U can contact me on jollydriss@yahoo.com or call me on 08034649417 our office locate at gbagada phase 2 lagos state. Thanks |
If u really want to start the memory card business micro sd in nigeria here, b/4 we used to take them to computer village and saka tinubu to sell it but now due to the way they delay our money we deside to be selling them to eny buyer who ready to pay us in time. Here is the price list: 1gb: 450 2gb: 570 4gb: 800 8gb: 1100 16gb 3000 32gb 4800 U can contact me on jollydriss@yahoo.com or call me on 08034649417 our office locate at gbagada phase 2 lagos state. Thanks |
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