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N44 is an emission nebula with superbubble structure located in the Large Magellanic Cloud, a satellite galaxy of the Milky Way in the constellation Dorado.
What is the emission nebula N44?
Originally catalogued in Karl Henize’s “Catalogue of H-alpha emission stars and nebulae in the Magellanic Clouds” of 1956, it is approximately 1,000 light-years wide and 160,000-170,000 light-years distant. N44 has a smaller bubble structure inside known as N44F. It is classified as an emission nebula because it contains large regions of ionized hydrogen.
The superbubble structure of N44 itself is shaped by the radiation pressure of a 40-star group located near its center; the stars are blue-white, very luminous, and incredibly powerful. N44F has been shaped in a similar manner; it has a hot, massive central star with an unusually powerful stellar wind that moves at 7 million kilometers per hour. This is because it loses material at 100 million times the rate of the Sun, or approximately 1,000,000,000,000,000 tons per year.
However, varying density in it has caused the formation of several dust pillars that may conceal star formation. This variable density is likely caused by previous supernovae in the vicinity of N44; many of the stars that have shaped it will eventually also end as supernovae. The past effects of supernovae are also confirmed by the fact that it emits x-rays.
Image: By Optical: ESO, X-ray: NASA/CXC/U.Mich./S.Oey, IR: NASA/JPL, CC BY 3.0,
Text: Wikipedia contributors. “N44 (emission nebula).” Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 22 May. 2017. Web. 14 Sep. 2017.