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Paper: Type-Ia SNR-Shell at z=3.5 Seen in the Three Sightlines toward the Gravitationally Lensed QSO B1422+231
Volume: 458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page: 129
Authors: Hamano, S.; Kobayashi, N.; Kondo, S.; Tsujimoto, T.; Okoshi, K.; Shigeyama, T.
Abstract: By making use of high spatial resolution of Subaru 8.2m Telescope and IRCS Echelle spectrograph, we obtained high-resolution near-infrared spectra of images A and B (AB ∼ 0''.5) of the gravitationally lensed QSO B1422+231 (z = 3.628) consisting of four known lensed images. We detected MgII and FeII absorption lines at z = 3.54, which show a large variance of column densities and velocities between the sightlines A and B with a projected separation of only 8.4 h70–1 pc at the redshift. The observed systematic variances between images A and B imply that the absorbing gas cloud is an expanding shell of a supernova remnant (SNR) as originally suggested by Rauch et al. for images A and C. Along with the Fe richness of the gas cloud, we conclude that the SNR is produced by a SNIa explosion.
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