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Derrick Hall satisfied with Dbacks buying and se

first_img Derrick Hall satisfied with D-backs’ buying and selling Top Stories Former Cardinals kicker Phil Dawson retires The 5: Takeaways from the Coyotes’ introduction of Alex Meruelo Stepfan Taylor, RB, 5th round (140th overall)A solid special teams player as well as a reliable runner, Taylor has appeared in 61 games (with four starts), though at no point has ever really threatened to take over as the lead back.Career stats: 120 carries, 393 yards, 1 rushing TD; 20 receptions, 154 yards, 3 TDs; 13 special teams tackles The Arizona Cardinals pulled out a dramatic 24-20 win over the Philadelphia Eagles Sunday at University of Phoenix Stadium, but they didn’t walk away totally unscathed.Running back Stepfan Taylor left the game with a calf injury and did not return. Head coach Bruce Arians updated Taylor’s condition Monday.“The only person that it looks like he could miss some time is Stepfan Taylor,” Arians said. “Stef strained a calf and could miss some significant time.” The injury comes just a week after Taylor’s breakout game. The second-year pro out of Stanford ran for a career-high 40 yards and a touchdown and added a receiving touchdown in the Cardinals’ 24-13 win over Oakland Oct. 5. For the season, Taylor has 18 carries for 63 yards and a touchdown and six catches for 40 yards and two scores.The Cardinals have dealt with their fair share of injuries this season, so they are well-equipped to deal with this one as well.“Marion Grice will slide up the depth chart. Robert Hughes could get some time, depending on what the situation is and what package, but yeah, Marion will be the next guy up,” Arians said.Grice, a rookie from Arizona State, made his pro debut Sunday, but didn’t get any carries. In fact, he played just one snap on special teams.Hughes caught two passes for 13 yards Sunday. He has carried twice for two yards and caught four passes for 27 yards this season. Comments   Share   Grace expects Greinke trade to have emotional impactlast_img read more

Clocking the hot gas gushing from the Milky Ways core

first_img Sign up for our daily newsletter Get more great content like this delivered right to you! Country Click to view the privacy policy. Required fields are indicated by an asterisk (*) The velocity measurement is “a great step forward,” says Douglas Finkbeiner of Harvard University, one of the astronomers who discovered the Fermi bubbles. According to Dmitry Malyshev, an astronomer at Stanford University in Palo Alto, California, “this is pioneering work” in the study of the Fermi bubbles.The speed reveals when the Fermi outflow started: 2.5 million to 4.0 million years ago. Astronomers recently gauged the age of the Fermi bubbles less directly, by arguing that whatever produced them also irradiated a long strand of gas shed by two nearby galaxies. The glow of this gas, called the Magellanic Stream, implies that the flare-up occurred 1 million to 3 million years ago. But using that argument to deduce the Fermi bubbles’ age is more circumstantial, Finkbeiner says, whereas the new estimate comes from dividing the distance by the speed to get the time, something so simple a high school physics student can do it. “We see that as a good thing,” Fox says.Unfortunately, neither the speed nor the age establishes how the Fermi bubbles formed—whether from black hole activity or from a starburst. But Fox’s team has already used Hubble to observe more than 20 additional quasars that lie behind other parts of the Fermi bubbles. When analyzed, this data should yield velocities throughout the bubbles, which may finally unveil their origin. Emailcenter_img Many galaxies are shooting material out of their cores, and in 2010 astronomers were surprised to discover that our galaxy was one of them, giving us a front-row seat on the phenomenon. They used the Fermi Gamma-ray Space Telescope to detect two huge lobes of gamma ray–emitting gas that extend far above and below the Milky Way’s center. Now, other astronomers have clocked the speed of this outflow in work that may eventually resolve the key question raised by its discovery: What caused it? A black hole or a burst of star birth?The so-called Fermi bubbles tower more than 30,000 light-years above and below the plane of the galaxy. Two chief theories exist to explain them. Perhaps material plunged toward the supermassive black hole at the Milky Way’s center and, swirling around it, generated strong magnetic fields that launched huge jets of gas, which produced the Fermi bubbles. Or perhaps the galactic downtown sparkled with hordes of new stars—a “starburst”—whose strong winds and supernova explosions cast material away. Now, astronomer Andrew Fox of the Space Telescope Science Institute in Baltimore, Maryland, and his colleagues have used the Hubble Space Telescope to measure how the expelled gas is moving. “For the first time, we’re really nailing down what the outflow speed is,” he says. The astronomers observed a far more distant source, a quasar in the constellation Serpens named PDS 456 that lies more than 2 billion light-years behind the northern Fermi bubble. As the quasar’s light zips through the Fermi bubble, carbon and silicon atoms in the gas absorb certain wavelengths of ultraviolet light. The Doppler shifts of these atoms indicate that some gas is racing toward us and some away—exactly the pattern we should see if material is spewing out of the galactic center. As the astronomers will report in an upcoming issue of The Astrophysical Journal Letters, the speed of the outflow is 900 to 1000 kilometers per second. 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