{"id":91,"date":"2017-02-20T15:51:10","date_gmt":"2017-02-20T13:51:10","guid":{"rendered":"http:\/\/phsites.technion.ac.il\/agn-2017\/?p=91"},"modified":"2017-02-20T15:59:51","modified_gmt":"2017-02-20T13:59:51","slug":"n-arav-distances-quasar-outflows","status":"publish","type":"post","link":"https:\/\/phsites.technion.ac.il\/agn-2017\/n-arav-distances-quasar-outflows\/","title":{"rendered":"N. Arav – Distances of quasar outflows"},"content":{"rendered":"

The most robust way for determining the distance of quasar absorption outflows is the use of troughs from excited states. Here we report the results of two surveys targeting outflows that show troughs from S iv. One survey includes 1091 SDSS and BOSS quasar spectra, and the other includes much higher quality spectra of 13 quasar observed with the Very Large Telescope. We demonstrate that the depth ratio of S iv* to S iv troughs is a powerful diagnostic for the distance of the outflows from the central source. Since S iv is formed in the same physical region of the outflow as the canonical outflow-identifying species Civ, the results of these surveys are applicable to the large majority of quasar outflows. We find that at least 50% of quasar outflows are at distances larger than 100 parsecs from the central source, and at least 12% are at distances larger than 1000 parsecs. These results have profound implications to the study of the origin and acceleration mechanism of quasar outflows, and their effects on the host galaxy.<\/p>\n

Questions regarding empirical methods of determining the distance of quasar outflows from the central source.<\/p>\n

    \n
  1. What Methods are currently used?<\/li>\n
  2. What is their ranking of reliability, as far as model-dependency, assumption that need to be made, and anything else that impact the robustness of the derived distances.<\/li>\n
  3. Do we have robust empirical evidence for quasar outflows situated at distances much smaller than 1 pc. from the central source?<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    The most robust way for determining the distance of quasar absorption outflows is the use of troughs from excited states. Here we report the results of two surveys targeting outflows that show troughs from S iv. One survey includes 1091 SDSS and BOSS quasar spectra, and the other includes much higher quality spectra of 13 …<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[3],"tags":[],"class_list":{"0":"post-91","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-talks","7":"entry"},"yoast_head":"\nN. Arav - Distances of quasar outflows - AGN Driven Winds<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/phsites.technion.ac.il\/agn-2017\/n-arav-distances-quasar-outflows\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"N. Arav - Distances of quasar outflows - AGN Driven Winds\" \/>\n<meta property=\"og:description\" content=\"The most robust way for determining the distance of quasar absorption outflows is the use of troughs from excited states. Here we report the results of two surveys targeting outflows that show troughs from S iv. 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