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X-WR-CALNAME:Osservatorio Astronomico di Roma
X-ORIGINAL-URL:https://www.oa-roma.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
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TZID:Europe/Rome
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DTSTART:20160327T010000
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DTSTART:20161030T010000
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DTSTART:20170326T010000
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DTSTART:20181028T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171003T114500
DTEND;TZID=Europe/Rome:20171003T124500
DTSTAMP:20260427T214314
CREATED:20170728T201245Z
LAST-MODIFIED:20170728T201245Z
UID:3349-1507031100-1507034700@www.oa-roma.inaf.it
SUMMARY:First black holes: observability and growth
DESCRIPTION:The first black hole seeds ​likely ​formed when the Universe was younger than 500 Myr​ old.\n​They play​ an important role ​in​ the growth of early (z=7) supermassive black holes. While ​much ​progress ha​s​ been made in understanding their formation and growth\, their observational signatures remain largely unexplored. As a result\, ​we are yet to ​detect ​these​ sources. ​We​ present a novel photometric method to identify black hole seed candidates in deep multi-wavelength surveys. The method relies on infrared and X-ray observations and selects​ the only two objects with a robust X-ray detection found in the CANDELS/GOODS-S survey with a photometric redshift z>6. To date\, these selected objects represent the most promising black hole seed candidates\, possibly formed via the direct collapse black hole scenario. While this result is based on the best photometric observations of high-z sources available to date\, additional ​gains are​ expected from deeper spectroscopic and X-ray data. For this reason\, ​we ​explore the role ​that ​JWST ​will play in the ​detect​on of ​the first black holes​ in ​the ​U​niverse.\nMoreover\, we present a novel probabilistic model for black hole growth: our results have important implications for the conditions that facilitate efficient black hole growth\, particularly at early cosmic epochs. By bringing in a precise definition of “growth probability”\, our finding clearly demonstrates quantitatively the generally-accepted concept that the super-massive black holes that we observed at z=7 are the “luckiest” members of the ensemble of high-z black holes. Our formalism has significant and broad ​consequences​ for upcoming observations of high-redshift quasars.
URL:https://www.oa-roma.inaf.it/event/simar-fabio-pacucci/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171003T114500
DTEND;TZID=Europe/Rome:20171003T124500
DTSTAMP:20260427T214314
CREATED:20170728T201245Z
LAST-MODIFIED:20170728T201245Z
UID:4712-1507031100-1507034700@www.oa-roma.inaf.it
SUMMARY:First black holes: observability and growth
DESCRIPTION:The first black hole seeds ​likely ​formed when the Universe was younger than 500 Myr​ old.\n​They play​ an important role ​in​ the growth of early (z=7) supermassive black holes. While ​much ​progress ha​s​ been made in understanding their formation and growth\, their observational signatures remain largely unexplored. As a result\, ​we are yet to ​detect ​these​ sources. ​We​ present a novel photometric method to identify black hole seed candidates in deep multi-wavelength surveys. The method relies on infrared and X-ray observations and selects​ the only two objects with a robust X-ray detection found in the CANDELS/GOODS-S survey with a photometric redshift z>6. To date\, these selected objects represent the most promising black hole seed candidates\, possibly formed via the direct collapse black hole scenario. While this result is based on the best photometric observations of high-z sources available to date\, additional ​gains are​ expected from deeper spectroscopic and X-ray data. For this reason\, ​we ​explore the role ​that ​JWST ​will play in the ​detect​on of ​the first black holes​ in ​the ​U​niverse.\nMoreover\, we present a novel probabilistic model for black hole growth: our results have important implications for the conditions that facilitate efficient black hole growth\, particularly at early cosmic epochs. By bringing in a precise definition of “growth probability”\, our finding clearly demonstrates quantitatively the generally-accepted concept that the super-massive black holes that we observed at z=7 are the “luckiest” members of the ensemble of high-z black holes. Our formalism has significant and broad ​consequences​ for upcoming observations of high-redshift quasars.
URL:https://www.oa-roma.inaf.it/event/simar-fabio-pacucci-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171010T113000
DTEND;TZID=Europe/Rome:20171010T123000
DTSTAMP:20260427T214314
CREATED:20170728T201510Z
LAST-MODIFIED:20170728T201510Z
UID:4713-1507635000-1507638600@www.oa-roma.inaf.it
SUMMARY:L'utilità della Scienza inutile
DESCRIPTION:Se i risultati scientifici finanziati con i soldi dei contribuenti sono “beni pubblici”\, è utile o addirittura etico spendere miliardi per cercare una particella elementare? O per andare a visitare un satellite di Giove o cercare l’acqua su Marte? O per osservare una galassia ai confini dell’Universo? In altre parole\, è utile finanziare la ricerca di base? E se sì\, con che risorse? E per fare quale tipo di ricerca?\nLa competizione è diventata una delle maggiori forze trainanti per la ricerca. Ma siamo sicuri che il modello “competition-driven science” sia davvero quello migliore?\nDi più\, sta cambiando il concetto stesso di conoscenza? Siamo sicuri che sia ancora valido e applicabile oggi il “metodo scientifico” introdotto da Galileo più di 400 anni fa?\nLe risposte a tutte queste domande non sono scontate\, anzi\, possono contenere molte sorprese non tutte piacevoli o rassicuranti\, risposte tra le quali cercheremo di orientarci usando un punto di vista non sempre convenzionale.\nLa presentazione\, in Italiano\, è aperta a tutto il personale\, anche ai non specialisti del settore.
URL:https://www.oa-roma.inaf.it/event/lutilita-della-scienza-inutile-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171010T113000
DTEND;TZID=Europe/Rome:20171010T123000
DTSTAMP:20260427T214314
CREATED:20170728T201510Z
LAST-MODIFIED:20170728T201510Z
UID:3352-1507635000-1507638600@www.oa-roma.inaf.it
SUMMARY:L'utilità della Scienza inutile
DESCRIPTION:Se i risultati scientifici finanziati con i soldi dei contribuenti sono “beni pubblici”\, è utile o addirittura etico spendere miliardi per cercare una particella elementare? O per andare a visitare un satellite di Giove o cercare l’acqua su Marte? O per osservare una galassia ai confini dell’Universo? In altre parole\, è utile finanziare la ricerca di base? E se sì\, con che risorse? E per fare quale tipo di ricerca?\nLa competizione è diventata una delle maggiori forze trainanti per la ricerca. Ma siamo sicuri che il modello “competition-driven science” sia davvero quello migliore?\nDi più\, sta cambiando il concetto stesso di conoscenza? Siamo sicuri che sia ancora valido e applicabile oggi il “metodo scientifico” introdotto da Galileo più di 400 anni fa?\nLe risposte a tutte queste domande non sono scontate\, anzi\, possono contenere molte sorprese non tutte piacevoli o rassicuranti\, risposte tra le quali cercheremo di orientarci usando un punto di vista non sempre convenzionale.\nLa presentazione\, in Italiano\, è aperta a tutto il personale\, anche ai non specialisti del settore.
URL:https://www.oa-roma.inaf.it/event/lutilita-della-scienza-inutile/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171017T114500
DTEND;TZID=Europe/Rome:20171017T124500
DTSTAMP:20260427T214314
CREATED:20170728T201627Z
LAST-MODIFIED:20170728T201627Z
UID:4714-1508240700-1508244300@www.oa-roma.inaf.it
SUMMARY:The primitive small bodies: from the origin of the solar system to the origin of life
DESCRIPTION:The so-called “primitive” small bodies (carbonaceous asteroids\, centaurs\, comets\, trans-Neptunian objects) have formed in the water- and organic-rich outer regions of the protoplanetary disk. They carry information on a number of evolutionary processes which have taken place since the solar system formation\, and\, in particular\, they are considered as the most probable source of terrestrial prebiotic material.\nIn this talk\, I will present the results of a 30-night observing programme carried out at the ESO-NTT in 2015-2017\, the first-ever spectroscopic survey dedicated to the “small” (up to a few hundred meters) near-Earth asteroids (NEAs). Noteworthy\, smaller asteroids could deposit prebiotic material on the early Earth in a more efficient way\, without massive water vaporization and destruction of organic molecules as in the case of larger impacts.\nI will also discuss about the ongoing sample return missions from primitive NEAs Ryugu and Bennu\, that will be reached in 2018 by the Hayabusa 2 (JAXA) and OSIRIS-REx (NASA) spacecrafts\, respectively. Such missions will be fundamental to assess if the organic compounds contained in primitive asteroids can indeed be associated with the formation of life on Earth.\nFinally\, I will report about a long-term observational programme aimed to investigate the composition and cometary activity of centaurs\, a transitional population between the trans-Neptunian regions and the inner solar system. It is to be reminded that the impact of Centaur-like objects might have significantly contributed to the delivery of noble gases and amino-acids to the early Earth.
URL:https://www.oa-roma.inaf.it/event/seminar-by-davide-perna-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171017T114500
DTEND;TZID=Europe/Rome:20171017T124500
DTSTAMP:20260427T214314
CREATED:20170728T201627Z
LAST-MODIFIED:20170728T201627Z
UID:3354-1508240700-1508244300@www.oa-roma.inaf.it
SUMMARY:The primitive small bodies: from the origin of the solar system to the origin of life
DESCRIPTION:The so-called “primitive” small bodies (carbonaceous asteroids\, centaurs\, comets\, trans-Neptunian objects) have formed in the water- and organic-rich outer regions of the protoplanetary disk. They carry information on a number of evolutionary processes which have taken place since the solar system formation\, and\, in particular\, they are considered as the most probable source of terrestrial prebiotic material.\nIn this talk\, I will present the results of a 30-night observing programme carried out at the ESO-NTT in 2015-2017\, the first-ever spectroscopic survey dedicated to the “small” (up to a few hundred meters) near-Earth asteroids (NEAs). Noteworthy\, smaller asteroids could deposit prebiotic material on the early Earth in a more efficient way\, without massive water vaporization and destruction of organic molecules as in the case of larger impacts.\nI will also discuss about the ongoing sample return missions from primitive NEAs Ryugu and Bennu\, that will be reached in 2018 by the Hayabusa 2 (JAXA) and OSIRIS-REx (NASA) spacecrafts\, respectively. Such missions will be fundamental to assess if the organic compounds contained in primitive asteroids can indeed be associated with the formation of life on Earth.\nFinally\, I will report about a long-term observational programme aimed to investigate the composition and cometary activity of centaurs\, a transitional population between the trans-Neptunian regions and the inner solar system. It is to be reminded that the impact of Centaur-like objects might have significantly contributed to the delivery of noble gases and amino-acids to the early Earth.
URL:https://www.oa-roma.inaf.it/event/seminar-by-davide-perna/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171024T114500
DTEND;TZID=Europe/Rome:20171024T124500
DTSTAMP:20260427T214314
CREATED:20170728T201742Z
LAST-MODIFIED:20170728T201742Z
UID:4715-1508845500-1508849100@www.oa-roma.inaf.it
SUMMARY:Observations of Fast Outflows in Active Galactic Nuclei
DESCRIPTION:The presence of outflows in many Active Galaxies has been firmly established through X-ray spectroscopy over the last two decades.\nThese outflows range from the low velocity warm absorbers commonly seen in many Seyfert galaxies\, through to the\nso called ultra fast outflows\, where the outflow velocities can reach a significant fraction of c.\nUltra fast outflows were first discovered in 2003\, from the presence of highly blue-shifted absorption lines from the X-ray spectra of quasars and AGN. The observational evidence for fast outflows will be reviewed\, as well as their wider properties and potential for feedback into the host galaxies of AGN. New data from large programs on the fast outflows\, such as PDS 456 and PG 1211+143\, will be shown\, the former showing a fast wide angle outflow\, while both AGN show highly variable outflows which may respond to the ionising continuum.\nThe evidence for fast soft X-ray absorption as well as the possible driving mechanisms of the winds will also be discussed.
URL:https://www.oa-roma.inaf.it/event/seminar-by-james-reeves-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171024T114500
DTEND;TZID=Europe/Rome:20171024T124500
DTSTAMP:20260427T214314
CREATED:20170728T201742Z
LAST-MODIFIED:20170728T201742Z
UID:3356-1508845500-1508849100@www.oa-roma.inaf.it
SUMMARY:Observations of Fast Outflows in Active Galactic Nuclei
DESCRIPTION:The presence of outflows in many Active Galaxies has been firmly established through X-ray spectroscopy over the last two decades.\nThese outflows range from the low velocity warm absorbers commonly seen in many Seyfert galaxies\, through to the\nso called ultra fast outflows\, where the outflow velocities can reach a significant fraction of c.\nUltra fast outflows were first discovered in 2003\, from the presence of highly blue-shifted absorption lines from the X-ray spectra of quasars and AGN. The observational evidence for fast outflows will be reviewed\, as well as their wider properties and potential for feedback into the host galaxies of AGN. New data from large programs on the fast outflows\, such as PDS 456 and PG 1211+143\, will be shown\, the former showing a fast wide angle outflow\, while both AGN show highly variable outflows which may respond to the ionising continuum.\nThe evidence for fast soft X-ray absorption as well as the possible driving mechanisms of the winds will also be discussed.
URL:https://www.oa-roma.inaf.it/event/seminar-by-james-reeves/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171031T114500
DTEND;TZID=Europe/Rome:20171031T124500
DTSTAMP:20260427T214314
CREATED:20170907T063500Z
LAST-MODIFIED:20170907T063500Z
UID:4727-1509450300-1509453900@www.oa-roma.inaf.it
SUMMARY:The first CEMP-no star in the Sculptor dwarf spheroidal galaxy
DESCRIPTION:The origin of carbon-enhanced metal-poor (CEMP) stars and their possible\nconnection with the chemical elements produced by the first stellar\ngeneration is still highly debated. Recently\, the first CEMP-no star in\nthe Sculptor dwarf spheroidal was discovered at an iron abundance of\n[Fe/H] = 8722;2.03 ± 0.10. Since Sculptor is one of the best studied\ndwarf galaxies in the Local Group\, it is surprising that until now\, only\none CEMP-no star has been found in this galaxy. The available observations\nsuggest that the fraction of CEMP stars in Sculptor is lower than in the\nGalactic halo. To understand this apparent discrepancy between different\nenvironments\, I will discuss the CEMP-no fraction in Sculptor\, and other\ndwarf galaxies in general.
URL:https://www.oa-roma.inaf.it/event/seminar-by-asa-skuladottir-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20171031T114500
DTEND;TZID=Europe/Rome:20171031T124500
DTSTAMP:20260427T214314
CREATED:20170907T063500Z
LAST-MODIFIED:20170907T063500Z
UID:3435-1509450300-1509453900@www.oa-roma.inaf.it
SUMMARY:The first CEMP-no star in the Sculptor dwarf spheroidal galaxy
DESCRIPTION:The origin of carbon-enhanced metal-poor (CEMP) stars and their possible\nconnection with the chemical elements produced by the first stellar\ngeneration is still highly debated. Recently\, the first CEMP-no star in\nthe Sculptor dwarf spheroidal was discovered at an iron abundance of\n[Fe/H] = 8722;2.03 ± 0.10. Since Sculptor is one of the best studied\ndwarf galaxies in the Local Group\, it is surprising that until now\, only\none CEMP-no star has been found in this galaxy. The available observations\nsuggest that the fraction of CEMP stars in Sculptor is lower than in the\nGalactic halo. To understand this apparent discrepancy between different\nenvironments\, I will discuss the CEMP-no fraction in Sculptor\, and other\ndwarf galaxies in general.
URL:https://www.oa-roma.inaf.it/event/seminar-by-asa-skuladottir/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
END:VCALENDAR