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DTSTART;TZID=Europe/Rome:20240109T113000
DTEND;TZID=Europe/Rome:20240109T123000
DTSTAMP:20260410T101005
CREATED:20230724T052951Z
LAST-MODIFIED:20240108T094705Z
UID:12037-1704799800-1704803400@www.oa-roma.inaf.it
SUMMARY:Black hole accretion flows: from nearby stellar binaries to quasars at cosmic dawn
DESCRIPTION:I will review what we know about the emission from the accretion flow\, starting with the stellar mass black holes in binary systems in our own galaxy. Scaling up to the supermassive black holes in active galaxies reveals both similarities and differences\, and I will review what these might show about the nature of the accretion flow in quasars.
URL:https://www.oa-roma.inaf.it/event/colloquium-christine-done/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20240116T080000
DTEND;TZID=Europe/Rome:20240116T170000
DTSTAMP:20260410T101005
CREATED:20231212T054733Z
LAST-MODIFIED:20240108T110811Z
UID:13268-1705392000-1705424400@www.oa-roma.inaf.it
SUMMARY:From high-mass X-ray binaries to ultraluminous X-ray sources: A (very personal!) journey through the realm of X-ray binaries
DESCRIPTION:X-ray binary systems are among the best astrophysical sources to study the processes of accretion of matter onto compact objects. Their broad phenomenology enables us to investigate distinct elements using a variety of analysis tools. In this talk\, I will cover two main categories: high-mass X-ray binaries\, represented by the archetypal Vela X-1\, and ultraluminous and hyperluminous X-ray sources (ULXs and HLXs). For the first source\, I will illustrate how high-resolution spectroscopy studies can help us investigate not only the compact object\, but also the wind of the companion star. For the other classes\, I will discuss an alternative method to determine the nature of the compact object in ULXs and I will present a population study of HLXs aiming at finding the best ULX-like candidates. This (very personal!) journey in the realm of X-ray binaries will also be a journey from sub- to super-Eddington accretion regimes.
URL:https://www.oa-roma.inaf.it/event/colloquium-roberta-amato-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20240123T113000
DTEND;TZID=Europe/Rome:20240123T123000
DTSTAMP:20260410T101005
CREATED:20230616T125016Z
LAST-MODIFIED:20240116T081405Z
UID:11800-1706009400-1706013000@www.oa-roma.inaf.it
SUMMARY:Colloquium - Deimer Alvarez - Omega Centauri: a chemical perspective to understand its history
DESCRIPTION:Nowadays we know that Globular Clusters (GCs) are formed by multiple populations (MPs) with different light element abundances (C\, N\, O\, Na\, Mg\, Al\, Si\, K) within the cluster stars\, that are structured in well-defined patterns\, such as the Na-O and Mg-Al anticorrelations. The evidence is interpreted as the signature of a self-enrichment process within the cluster\, where a second population of stars was formed from material processed in the first population (or polluter) stars through the hot CNO cycle and its secondary NeNa and MgAl chains. A detailed study of these chemical anomalies is one of the paths to disentangle among the polluters proposed in the literature. In this sense\, ω Centauri represents an ideal laboratory since this GC-like system exhibits magnified all the chemical anomalies usually observed in normal GCs. However\, this system has a more complex history than a typical GC since it is probably the nuclear star cluster of a disrupted dwarf galaxy.\nIn this talk\, through a chemical perspective I will show 1) how the outcomes of the MgAl chain can help to put more constraints on the nature of polluters responsible for the formation of MPs\, and 2) what can we learn about the history of ω Centauri thanks to its metallicity distribution.
URL:https://www.oa-roma.inaf.it/event/colloquium-antonio-alvarez-deimer/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
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DTSTART;TZID=Europe/Rome:20240130T113000
DTEND;TZID=Europe/Rome:20240130T123000
DTSTAMP:20260410T101005
CREATED:20230920T100505Z
LAST-MODIFIED:20240126T063546Z
UID:12194-1706614200-1706617800@www.oa-roma.inaf.it
SUMMARY:colloquium Francesco Carotenuto - Relativistic jets from black hole X-ray binaries: a MeerKAT view
DESCRIPTION:Black hole X-ray binaries (BH XRBs) can launch powerful outflows in the form of radio-emitting discrete jet ejecta\, which are generally observed to be produced during bright outburst phases and to propagate at apparently superluminal speeds. However\, little is known about the powering mechanism\, the formation and composition of these jets\, and studying them is important for understanding both their physics and their feedback on the surrounding environment. While discrete ejecta have been historically difficult to detect and to follow in their motion away from the central black hole\, the MeerKAT radio-interferometer (precursor of the SKA) is now revolutionizing the field with its exceptional sensitivity at GHz frequencies. In this talk\, I will present some of the most interesting advancements that we have obtained with MeerKAT observations of BH XRBs in the last five years\, as part of the ThunderKAT collaboration. More in detail\, I will present the MeerKAT detection of a number of new ejecta that we observed to interact with the interstellar medium (ISM) and to strongly decelerate at parsec scales far from the black hole. In this context\, covering the deceleration phase is essential for the physical modelling of the jet kinematics\, and I will discuss what is possible to learn from the application of these models on the jet physical parameters and on the properties of the environment surrounding BH XRBs.
URL:https://www.oa-roma.inaf.it/event/colloquium-francesco-carotenuto/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
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