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Superbubble DEM L50
#1

[تصویر:  13594761211.jpg]




This composite
image shows the superbubble DEM L50 (a.k.a. N186) located in the Large
Magellanic Cloud about 160,000 light years from Earth. Superbubbles are
found in regions where massive stars have formed in the last few million
years. The massive stars produce intense radiation, expel matter at
high speeds, and race through their evolution to explode as supernovas.
The winds and supernova shock waves carve out huge cavities called
superbubbles in the surrounding gas.




X-rays from NASA's Chandra X-ray Observatory are shown in pink and
optical data from the Magellanic Cloud Emission Line Survey (MCELS) are
colored in red, green and blue. The MCELS data were obtained with the
University of Michigan's 0.9-meter Curtis Schmidt telescope at Cerro
Tololo Inter-American Observatory (CTIO). The shape of DEM L50 is
approximately an ellipse, with a supernova remnant named SNR N186 D
located on its northern edge.




Like another superbubble in the LMC, N44, DEM L50 gives off about 20
times more X-rays than expected from standard models for the evolution
of superbubbles. A Chandra study published in 2011 showed that there are
two extra sources of the bright X-ray emission: supernova shock waves
striking the walls of the cavities, and hot material evaporating from
the cavity walls.




The Chandra study of DEM L50 was published in the Astrophysical Journal
in 2011 and was led by Anne Jaskot from the University of Michigan in
Ann Arbor. The Chandra study of DEM L50 was led by Anne Jaskot from the
University of Michigan in Ann Arbor. The co-authors were Dave Strickland
from Johns Hopkins University in Baltimore, MD, Sally Oey from
University of Michigan, You-Hua Chu from University of Illinois and
Guillermo Garcia-Segura from Instituto de Astronomia-UNAM in Ensenada,
Mexico.




NASA's Marshall Space Flight Center in Huntsville, Ala., manages the
Chandra program for NASA's Science Mission Directorate in Washington.
The Smithsonian Astrophysical Observatory controls Chandra's science and
flight operations from Cambridge, Mass.




Credits: X-ray: NASA/CXC/Univ of Michigan/A.E.Jaskot, Optical: NOAO/CTIO/MCELS




› Read more/access all images


› Chandra's Flickr photoset




J.D. Harrington, 202-358-0321
Headquarters, Washington
j.d.harrington@nasa.gov

Janet Anderson, 256-544-0034
Marshall Space Flight Center, Huntsville, Ala.
janet.l.anderson@nasa.gov

Megan Watzke 617-496-7998
Chandra X-ray Center, Cambridge, Mass.
mwatzke@cfa.harvard.edu

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  A Surprisingly Bright Superbubble (لذت ببرید ! ) amir astronomer 1 245 01-09-2012، 03:17 AM
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