Download or read book Constraining the Properties of the Multiphase Absorption System at Z written by Benjamin Rosenwasser and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of photoionization and collisional ionization modeling are presented of the strong MgII absorption system at redshift z [almost equal to] 0.93 towards the quasar PG1206+459. A combination of spectra from Keck/HIRES, HST/FOS, HST/STIS, and the recent observations of OVI from HST/COS are used in the analysis. This system has been extensively studied over the last two decades (Churchill & Charlton 1999; Ding et al. 2003; Tripp et al. 2011), and updated constraints using the recent data are presented. Numerous absorption components are spread over a range of ~1500 km/s, and multiple ionization phases are required to account for the detected transitions, which include MgI, MgII, FeII, SiII, SiIII, SiIV, CII, CIII, CIV, SIII, SIV, SV, SVI, NIII, NIV, NV, OIII, OIV, OV, OVI, and NeVIII. Considering the new constraints, the question of the physical nature of the absorption system is revisited, which in the past has been interpreted as arising in a group of galaxies or a post-starburst outflow from a single galaxy.