THE A2667 GIANT ARC AT z = 1.03: EVIDENCE FOR LARGE-SCALE SHOCKS AT HIGH REDSHIFT

摘要: We present the spatially resolved emission line ratio properties of a {approx}10{sup 10} M {sub Sun} star-forming galaxy at redshift z = 1.03. This is gravitationally lensed as triple-image giant arc behind massive lensing cluster A2667. The main image has magnification factors 14 {+-} 2.1 in flux and {approx}2 Multiplication-Sign 7 area, yielding an intrinsic spatial resolution 115-405 pc after adaptive optics correction with OSIRIS KECK II. Hubble Space Telescope morphology shows clumpy structure H{alpha} kinematics indicates large velocity dispersion V max} sin (i)/{sigma} {approx} 0.73, consistent high-redshift disk galaxies similar masses. From [N II]/H{alpha} ratios, we find that central 350 dominated by star formation. ratios are higher outer than regions. Most noticeably, blueshifted region strong disk. Applying our recent H II slow-shock models, propose this elevated contaminated significant fraction shock excitation due to galactic outflows. Our analysis suggests shockedmore » regions may mimic flat or inverted metallicity gradients high redshift.« less