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ابری داغ که کهکشان ما را احاطه کرده !
#1
[تصویر:  13486694591.jpg]




This artist's illustration shows an enormous halo of hot gas (in blue)
around the Milky Way galaxy. Also shown, to the lower left of the Milky
Way, are the Small and Large Magellanic Clouds, two small neighboring
galaxies. The halo of gas is shown with a radius of about 300,000 light
years, although it may extend significantly further.




Data from NASA's Chandra X-ray Observatory was used to estimate [link to
press release] that the mass of the halo is comparable to the mass of
all the stars in the Milky Way galaxy. If the size and mass of this gas
halo is confirmed, it could be the solution to the "missing-baryon"
problem for the Galaxy.




In a recent study, a team of five astronomers used data from Chandra,
ESA's XMM-Newton, and Japan's Suzaku satellite to set limits on the
temperature, extent and mass of the hot gas halo. Chandra observed
eight bright X-ray sources located far beyond the Galaxy at distances of
hundreds of millions of light years. The data revealed that X-rays from
these distant sources are selectively absorbed by oxygen ions in the
vicinity of the Galaxy. The nature of the absorption allowed the
scientists to determine that the temperature of the absorbing halo is
between 1 million and 2.5 million Kelvins.




Other studies have shown that the Milky Way and other galaxies are
embedded in warm gas, with temperatures between 100,000 and one million
degrees, and there have been indications that a hotter component with a
temperature greater than a million degrees is also present. This new
research provides evidence that the mass in the hot gas halo enveloping
the Milky is much greater than that of the warm gas.




Credits: NASA/CXC/M.Weiss; NASA/CXC/Ohio State/A.Gupta et al.
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