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DTSTART;TZID=Europe/Rome:20230404T113000
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DTSTAMP:20260406T064133
CREATED:20230210T064348Z
LAST-MODIFIED:20230322T075149Z
UID:11283-1680607800-1680611400@www.oa-roma.inaf.it
SUMMARY:Colloquium - Gianluca Castignani: Processing of gas in galaxies within the cosmic web
DESCRIPTION:Galaxies are distributed in a complex filamentary network of matter called the cosmic web. Several studies showed that galaxy properties can be influenced by their large scale environments: spiral galaxies may interact and merge into an elliptical galaxy\, they can be stripped from their gas by ram pressure and see their star formation quenched\, they can be harassed in small groups\, even before entering into clusters. However\, it remains debated which is the overall impact of the cosmic web in processing cold gas of galaxies\, as they move through large-scale filaments around the clusters down to the densest regions of the cluster cores. To evaluate the degree of such processing it is essential to study the reservoirs of molecular gas as it is the raw material from which stars form. I will present the results of a large observational campaign\, mainly exploiting IRAM millimeter facilities\, with the goal of quantifying the processing of galaxies’ gas in the cosmic web and with cosmic time. I will discuss the degree of such processing in a variety of dense megaparsec-scale environments for: i) galaxies in the cosmological filaments around Virgo\, the nearest cluster in the Universe\, ii) galaxies in and around clusters at intermediate redshifts\, iii) distant brightest cluster galaxies (BCGs) at the center of clusters. Finally\, I will discuss the potential of such studies for next generation multi-wavelength facilities. Thousands of distant clusters and BCGs will be detected with Euclid\, enabling an unprecedented leverage to constrain galaxy evolution in clusters.
URL:https://www.oa-roma.inaf.it/event/colloquium-gianluca-castignani/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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DTSTART;TZID=Europe/Rome:20230418T113000
DTEND;TZID=Europe/Rome:20230418T123000
DTSTAMP:20260406T064133
CREATED:20230210T064525Z
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SUMMARY:colloquium - Eilat Glikman: Understanding the role of Quasar feedback and Radio emission in red Quasars
DESCRIPTION:Observational evidence suggests that quasar activity plays an important role in regulating how \ngalaxies and their nuclear supermassive black holes grow and co-evolve\, despite their \norders-of-magnitude difference in scale. In this talk\, I will present a population of highly \nluminous dust-reddened quasars that may be the key to understanding this co-evolution. Red \nquasars are among the most intrinsically-luminous quasars in the Universe representing a \nshort-lived phase in the lifetime of a quasar\, during which their energy output (feedback) \nirrevocably impacts their host galaxy. Recent evidence has also shown that red quasars have \nenhanced radio emission\, possibly linking the formation of jets to the merger phenomenon or \nexposing a different form of feedback in these systems\, such as dusty radiation-driven winds. \nRed quasars are thus ideal laboratories for addressing fundamental questions on the co-evolution \nof black holes and their host galaxies as well as the physics of feedback. I will present \nfindings from several surveys that are uncovering this elusive population of quasars using \nvarious selection methods across the electromagnetic spectrum to probe a broad range of redshift \nand luminosity regimes.
URL:https://www.oa-roma.inaf.it/event/colloquium-eliat-glikman/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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