TYPE Ia SUPERNOVA REMNANT SHELL ATz= 3.5 SEEN IN THE THREE SIGHTLINES TOWARD THE GRAVITATIONALLY LENSED QSO B1422+231

摘要: Using the Subaru 8.2m Telescope with an IRCS Echelle spectrograph, we obtained high-resolution (R=10,000) near-infrared (1.01-1.38 \mu m) spectra of images A and B gravitationally lensed QSO B1422+231 (z=3.628) consisting four known images. We detected MgII absorption lines at z=3.54, which show a large variance column densities (~ 0.3 dex) velocities 10 km/s) between sightlines projected separation only 8.4h_{70}^{-1} pc redshift. This is smallest spatial structure high-z gas clouds ever after Rauch et al. found 20-pc scale for same z=3.54 system using optical C. The observed systematic variances imply that expanding shell as originally suggested by By combining data three sightlines, managed to constrain radius expansion velocity 50-100 pc, 130 km/s), concluding truly supernova remnant (SNR) rather than other types objects, such giant HII region. also strong FeII this system, but much broader Doppler width \alpha-element lines. suggest line originates in localized FeII-rich cloud not completely mixed plowed ambient interstellar showing low-ion Along Fe richness, conclude SNR produced SNIa explosion.