HST/COS Observations of Quasar Outflows in the 500-1050 A Rest Frame. II. The Most Energetic Quasar Outflow Measured to Date

摘要

We present a study of the BAL outflows seen in quasar SDSS J1042+1646 (z = 0.978) in the rest-frame 500-1050 angstrom (EUV500) region. The results are based on the analysis of recent Hubble Space Telescope/Cosmic Origins Spectrograph observations. Five outflow systems are identified, where, in total, they include similar to 70 outflow troughs from ionic transitions. These include the first non-solar detections from transitions of O V*, Ne V*, Ar VI, Ca VI, Ca VII, and Ca VIII. The appearance of very high-ionization species (e.g., Ne VIII, Na IX, and Mg X) in all outflows necessitates at least two ionization phases for the observed outflows. We develop an interactive Synthetic Spectral Simulation method to fit the multitude of observed troughs. Detections of density sensitive troughs (e.g., S IV* lambda 661.40 angstrom and the O V*multiplet) allow us to determine the distance of the outflows (R) as well as their energetics. Two of the outflows are at R similar or equal to 800 pc and one is at R similar or equal to 15 pc. One of the outflows has the highest kinetic luminosity on record ((E) over bar (k) = 5 x 10(46) erg s(-1)), which is 20% of its Eddington luminosity. Such a large ratio suggests that this outflow can provide the energy needed for active galactic nucleus feedback mechanisms.