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- W2080455098 abstract "The Origem Loop in the Galactic anticentre was discovered in 1970s and suggested to be a large supernova remnant. It was argued later to be a chance superposition of unrelated radio sources. We attempt to understand the properties of the Origem Loop. Available multi-frequency radio data were used for the determination of radio spectra of different parts of the Origem Loop and the polarization properties of the loop. Newly available sensitive observations show that the Origem Loop is a loop of more than 6 deg in diameter. It consists of a large non-thermal arc in the north, which we call the Origem Arc, and several known thermal H II regions in the south. Polarized radio emission associated with the arc was detected at 6 cm, revealing tangential magnetic fields. The arc has a brightness temperature spectral index of beta = -2.70, indicating its non-thermal nature as a supernova remnant. We estimate the distance to the Origem Arc to be about 1.7 kpc, similar to those of some H II regions in the southern part of the loop. The Origem Loop is a visible loop in the sky, which consists of a supernova remnant arc in the north and H II regions in the south." @default.
- W2080455098 created "2016-06-24" @default.
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- W2080455098 date "2013-02-11" @default.
- W2080455098 modified "2023-09-25" @default.
- W2080455098 title "The Origem Loop" @default.
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- W2080455098 doi "https://doi.org/10.1051/0004-6361/201219805" @default.
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