%0 Generic %1 arav2013quasar %A Arav, Nahum %A Borguet, Benoit %A Chamberlain, Carter %A Edmonds, Doug %A Danforth, Charles %D 2013 %K agn feedback outflows qso %T Quasar Outflows and AGN Feedback in the Far UV: HST/COS Observations of QSO HE0238-1904 %U http://arxiv.org/abs/1305.2181 %X Spectroscopic observations of quasar outflows at rest-frame 500-1000 Angstrom have immense diagnostic power. We present analyses of such data, where absorption troughs from three important ions are measured: first, O IV and O IV* that allow us to obtain the distance of high ionization outflows from the AGN; second, Ne VIII and Mg X that are sensitive to the very high ionization phase of the outflow. Their inferred column densities, combined with those of troughs from O VI, N IV, and H I, yield two important results: 1) The outflow shows two ionization phases, where the high ionization phase carries the bulk of the material. This is similar to the situation seen in x-ray warm absorber studies. Furthermore, the low ionization phase is inferred to have a volume filling factor of 10^(-5)-10^(-6). 2) From the O IV to O IV* column density ratio, and the knowledge of the ionization parameter, we determine a distance of 3000 pc. from the outflow to the central source. Since this is a typical high ionization outflow, we can determine robust values for the mass flux and kinetic 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 bolometric luminosity. Such a large kinetic luminosity and mass flow rate measured in a typical high ionization wind suggests that quasar outflows are a major contributor to AGN feedback mechanisms.

@misc{arav2013quasar, abstract = {Spectroscopic observations of quasar outflows at rest-frame 500-1000 Angstrom have immense diagnostic power. We present analyses of such data, where absorption troughs from three important ions are measured: first, O IV and O IV* that allow us to obtain the distance of high ionization outflows from the AGN; second, Ne VIII and Mg X that are sensitive to the very high ionization phase of the outflow. Their inferred column densities, combined with those of troughs from O VI, N IV, and H I, yield two important results: 1) The outflow shows two ionization phases, where the high ionization phase carries the bulk of the material. This is similar to the situation seen in x-ray warm absorber studies. Furthermore, the low ionization phase is inferred to have a volume filling factor of 10^(-5)-10^(-6). 2) From the O IV to O IV* column density ratio, and the knowledge of the ionization parameter, we determine a distance of 3000 pc. from the outflow to the central source. Since this is a typical high ionization outflow, we can determine robust values for the mass flux and kinetic 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 bolometric luminosity. Such a large kinetic luminosity and mass flow rate measured in a typical high ionization wind suggests that quasar outflows are a major contributor to AGN feedback mechanisms.}, added-at = {2013-05-10T22:31:49.000+0200}, author = {Arav, Nahum and Borguet, Benoit and Chamberlain, Carter and Edmonds, Doug and Danforth, Charles}, biburl = {https://www.bibsonomy.org/bibtex/27641dcc42e8bad0124ab76bbaf9c645b/miki}, description = {[1305.2181] Quasar Outflows and AGN Feedback in the Far UV: HST/COS Observations of QSO HE0238-1904}, interhash = {8e3a4fa4b783ea6d717d13cb99718326}, intrahash = {7641dcc42e8bad0124ab76bbaf9c645b}, keywords = {agn feedback outflows qso}, note = {cite arxiv:1305.2181Comment: 61 pages, 12 figures, submitted to ApJ}, timestamp = {2013-05-10T22:31:49.000+0200}, title = {Quasar Outflows and AGN Feedback in the Far UV: HST/COS Observations of QSO HE0238-1904}, url = {http://arxiv.org/abs/1305.2181}, year = 2013 }