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- W2315421110 abstract "We used the imaging Fourier transform spectrometer Spectromètre Imageur de l'Observatoire du Mont-Mégantic (SpIOMM) to obtain hyperspectral cubes of the young supernova remnant Cassiopeia A (Cas A). The cubes contain over 5000 spatially resolved spectra covering the spectral range 6480–7050 Å. We first investigate the slow-moving N-rich quasi-stationary flocculi by measuring their radial velocity as well as the [N ii] λ6583/Hα ratio. No correlation between their radial velocity and [N ii] λ6583/Hα ratio with their location has been found. We used multi-epoch observations from the Hubble Space Telescope to create a proper motion map, showing the displacement of several filaments over the most part of Cas A. Combining data from SpIOMM and Hubble, we re-evaluate the distance to Cas A and obtained 3.33 ± 0.10 kpc, which is in good agreement with previous estimates. Finally, we obtain a three-dimensional spatial view of the [S ii] λλ6716, 6731 emissions showing their location, expansion velocity and the [S ii] doublet line ratio for multiple locations in the remnant. The velocity asymmetry reported by previous analyses is clearly visible. Also, the [S ii] doublet ratio (with a mean value of 0.5 ± 0.2) indicates a very high and variable electronic density throughout the remnant." @default.
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- W2315421110 date "2014-05-24" @default.
- W2315421110 modified "2023-10-14" @default.
- W2315421110 title "A hyperspectral view of Cassiopeia A" @default.
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- W2315421110 doi "https://doi.org/10.1093/mnras/stu774" @default.
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