HST/COS Observations of Quasar Outflows in the 500–1050 Å Rest Frame. V. Richness of Physical Diagnostics and Ionization Potential-dependent Velocity Shift in PKS J0352-0711*

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Abstract We analyze absorption troughs from two outflows within PKS J0352-0711 (S1 at −1950 km s−1 and S2 at −3150 km s−1) from spectra taken with Hubble Space Telescope/Cosmic Origins Spectrograph, which cover the diagnostic-rich 585–900 Å rest-frame wavelength range. In S2, for the first time we clearly detect absorption troughs from Ca iv, Ca v, Ca v*, Ca vii*, and Ca viii*. The column density measurement of Ca v suggests S2 has a super-solar metallicity. Both outflows require at least two ionization phases where the column density of the very high-ionization phase is roughly 15 times larger than the corresponding high-ionization phase. These high column densities and very high-ionization potential ions are similar to X-ray warm absorbers. The two phases of S2 show a unique velocity centroid shift between associated troughs. Through Monte Carlo measurements of the O v* absorption troughs, we determine the electron number density of S2 (fully corroborated by independent measurements from the Ca vii* and Ca viii* troughs), yielding a distance of 9 pc and a kinetic luminosity of 2 × 1043 erg s−1. S1 is located farther away at 500 pc from the central source with a kinetic luminosity of 1043 erg s−1.