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DTSTART;TZID=Europe/Rome:20170613T114500
DTEND;TZID=Europe/Rome:20170613T124500
DTSTAMP:20260404T224823
CREATED:20170421T154636Z
LAST-MODIFIED:20170421T154636Z
UID:2906-1497354300-1497357900@www.oa-roma.inaf.it
SUMMARY:The WISSH quasars project: revealing ultra-massive black-holes and powerful winds in the most luminous AGN
DESCRIPTION:The systematic investigation of hyper-luminous quasars shining at the golden epoch of AGN activity offers the unique opportunity of studying the power and the effect of AGN feedback at its extreme.\nThe WISE/SDSS selected hyper-luminous (WISSH) quasar survey is an extensive\nmulti-band observing program (from millimeter wavelengths to hard X rays) designed to accurately probe the role of nuclear activity in SMBH-galaxy self-regulated growth via extended outflows.\nOur on-going project aims at constraining both AGN and host galaxy ISM and star-formation properties in a large sample of ~90 broad-line quasars at the brightest end of the AGN luminosity function (L_bol > 1e14 L_sun)\, and at the peak of their number density (z ~ 2.5 – 3.5).\nI will review the most important results of the near-IR spectroscopic follow-up of WISSH quasars (available for ~40% of the sample) performed with the LUCI at LBT and SINFONI.\nWe found that WISSH quasars are typically powered by highly accreting (0.3-3 Ledd)\, ten billion solar masses SMBHs\, demonstrating that WISSH provides a simple and valuable tool to complete the census of the extreme SMBH population in the universe. We also succeeded in discovering [OIII] emission lines with a broad\, skewed profile and exceptional luminosities (> 6e44 erg/s)\, tracing very powerful ionized outflows (up to ~4% of L_bol) in ~30% of the sample.\nRemarkably\, the remaining 70% of quasars lacks [OIII] emission but shows strong winds traced by 3\,000-8\,000 km/s blueshifts of the high-ionization (CIV) with respect to low-ionization (Hbeta) broad emission lines\, revealing strong radiatively driven winds that dominate the BLR kinematics. Finally\, I will discuss the possible causes behind this intriguing dichotomy which involve fundamental parameters such as bolometric luminosity\, SMBH mass\, Eddington ratio and the shape of the UV-X-ray spectrum.
URL:https://www.oa-roma.inaf.it/event/talk-by-giustina-vietri/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20170613T114500
DTEND;TZID=Europe/Rome:20170613T124500
DTSTAMP:20260404T224823
CREATED:20170421T154636Z
LAST-MODIFIED:20170421T154636Z
UID:4710-1497354300-1497357900@www.oa-roma.inaf.it
SUMMARY:The WISSH quasars project: revealing ultra-massive black-holes and powerful winds in the most luminous AGN
DESCRIPTION:The systematic investigation of hyper-luminous quasars shining at the golden epoch of AGN activity offers the unique opportunity of studying the power and the effect of AGN feedback at its extreme.\nThe WISE/SDSS selected hyper-luminous (WISSH) quasar survey is an extensive\nmulti-band observing program (from millimeter wavelengths to hard X rays) designed to accurately probe the role of nuclear activity in SMBH-galaxy self-regulated growth via extended outflows.\nOur on-going project aims at constraining both AGN and host galaxy ISM and star-formation properties in a large sample of ~90 broad-line quasars at the brightest end of the AGN luminosity function (L_bol > 1e14 L_sun)\, and at the peak of their number density (z ~ 2.5 – 3.5).\nI will review the most important results of the near-IR spectroscopic follow-up of WISSH quasars (available for ~40% of the sample) performed with the LUCI at LBT and SINFONI.\nWe found that WISSH quasars are typically powered by highly accreting (0.3-3 Ledd)\, ten billion solar masses SMBHs\, demonstrating that WISSH provides a simple and valuable tool to complete the census of the extreme SMBH population in the universe. We also succeeded in discovering [OIII] emission lines with a broad\, skewed profile and exceptional luminosities (> 6e44 erg/s)\, tracing very powerful ionized outflows (up to ~4% of L_bol) in ~30% of the sample.\nRemarkably\, the remaining 70% of quasars lacks [OIII] emission but shows strong winds traced by 3\,000-8\,000 km/s blueshifts of the high-ionization (CIV) with respect to low-ionization (Hbeta) broad emission lines\, revealing strong radiatively driven winds that dominate the BLR kinematics. Finally\, I will discuss the possible causes behind this intriguing dichotomy which involve fundamental parameters such as bolometric luminosity\, SMBH mass\, Eddington ratio and the shape of the UV-X-ray spectrum.
URL:https://www.oa-roma.inaf.it/event/talk-by-giustina-vietri-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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