English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Spectroscopic observations of quasar outflows at rest-frame 500-1000 Angstromhave immense diagnostic power. We present analyses of such data, whereabsorption troughs from three important ions are measured: first, O IV and OIV* that allow us to obtain the distance of high ionization outflows from theAGN; second, Ne VIII and Mg X that are sensitive to the very high ionizationphase of the outflow. Their inferred column densities, combined with those oftroughs from O VI, N IV, and H I, yield two important results: 1) The outflowshows two ionization phases, where the high ionization phase carries the bulkof the material. This is similar to the situation seen in x-ray warm absorberstudies. Furthermore, the low ionization phase is inferred to have a volumefilling factor of 10^(-5)-10^(-6). 2) From the O IV to O IV* column densityratio, and the knowledge of the ionization parameter, we determine a distanceof 3000 pc. from the outflow to the central source. Since this is a typicalhigh ionization outflow, we can determine robust values for the mass flux andkinetic luminosity of the outflow: 40 solar masses per year and 10^45 ergs/s,respectively, where the latter is roughly equal to 1% of the bolometricluminosity. Such a large kinetic luminosity and mass flow rate measured in atypical high ionization wind suggests that quasar outflows are a majorcontributor to AGN feedback mechanisms.

Quasar Outflows and AGN Feedback in the Far UV: HST/COS Observations of QSO HE0238-1904