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X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
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DTSTART:20160327T010000
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DTSTART:20161030T010000
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DTSTART:20181028T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20170606T114500
DTEND;TZID=Europe/Rome:20170606T124500
DTSTAMP:20260405T142249
CREATED:20170412T103150Z
LAST-MODIFIED:20170412T103150Z
UID:2849-1496749500-1496753100@www.oa-roma.inaf.it
SUMMARY:Dwarf spheroidal satellite galaxies under the eye of Cherenkov telescopes: indirect search for dark matter by MAGIC and opportunities and prospects for CTA
DESCRIPTION:Searching for gamma-ray signals from dark matter annihilation in dwarf\nspheroidal satellite galaxies (dSphs) of the Milky Way plays a critical\nrole within the framework of indirect dark matter searches. This study\,\naimed at unveiling the nature of the most elusive component of the\nUniverse\, is potentially able to confirm the dark matter interpretation of\nthe observed gamma-ray excess in the Galactic Center.\nThanks to deep observation campaigns on dSphs\, MAGIC achieved stringent\nconstraints to dark matter annihilation cross section\, testing new\nanalysis tools for the investigation of extended regions. In this talk\, I\nwill present both results achieved by MAGIC and the importance of DM\ntailored analysis tools and the proper selection of new dSph targets\, in\norder to propose scientific cases for CTA\, the upcoming generation of\nCherenkov telescopes.
URL:https://www.oa-roma.inaf.it/event/talk-by-paola-giammaria/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20170606T114500
DTEND;TZID=Europe/Rome:20170606T124500
DTSTAMP:20260405T142249
CREATED:20170412T103150Z
LAST-MODIFIED:20170412T103150Z
UID:4709-1496749500-1496753100@www.oa-roma.inaf.it
SUMMARY:Dwarf spheroidal satellite galaxies under the eye of Cherenkov telescopes: indirect search for dark matter by MAGIC and opportunities and prospects for CTA
DESCRIPTION:Searching for gamma-ray signals from dark matter annihilation in dwarf\nspheroidal satellite galaxies (dSphs) of the Milky Way plays a critical\nrole within the framework of indirect dark matter searches. This study\,\naimed at unveiling the nature of the most elusive component of the\nUniverse\, is potentially able to confirm the dark matter interpretation of\nthe observed gamma-ray excess in the Galactic Center.\nThanks to deep observation campaigns on dSphs\, MAGIC achieved stringent\nconstraints to dark matter annihilation cross section\, testing new\nanalysis tools for the investigation of extended regions. In this talk\, I\nwill present both results achieved by MAGIC and the importance of DM\ntailored analysis tools and the proper selection of new dSph targets\, in\norder to propose scientific cases for CTA\, the upcoming generation of\nCherenkov telescopes.
URL:https://www.oa-roma.inaf.it/event/talk-by-paola-giammaria-2/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20170613T114500
DTEND;TZID=Europe/Rome:20170613T124500
DTSTAMP:20260405T142249
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:20260405T142249
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
END:VEVENT
END:VCALENDAR