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DTSTART:20190331T010000
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DTSTART:20191027T010000
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DTSTART:20200329T010000
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DTSTART;TZID=Europe/Rome:20200204T114500
DTEND;TZID=Europe/Rome:20200204T124500
DTSTAMP:20260408T023501
CREATED:20190926T124553Z
LAST-MODIFIED:20200127T150346Z
UID:6853-1580816700-1580820300@www.oa-roma.inaf.it
SUMMARY:The X-ray universe at microarsec resolution: the power and promise of X-ray interferometry
DESCRIPTION:The spectacular image of a supermassive black hole `shadow’ taken by the Event Horizon Telescope last year highlights the potential of being able to resolve microarcsecond scale structures in astrophysical sources.  Given the ~Angstrom scale of X-ray wavelengths\, similar resolutions are theoretically possible with only a 1 m diameter telescope\, which could be accommodated on a single spacecraft. Conventional X-ray imaging capability remains far from from this goal however.\nIn this talk I will explore the possibility\, recently proposed to ESA’s Voyage 2050 program\, of developing X-ray interferometry to break the resolution barrier in the X-rays\, starting from X-ray fringes which have already been observed in the lab and examining what would be required for an X-ray interferometric space observatory\, from the possibilities with single spacecraft to formation flyers which could push to sub-microarcsecond resolution. Such revolutionary observatories would enable detailed imaging-spectroscopy of stellar coronae and transiting exoplanets within ~100 pc\, direct observation of X-ray binary orbits\, supermassive black hole accretion flows and event horizons\, and imaging of luminous transients and binary supermassive black holes across the observable universe.
URL:https://www.oa-roma.inaf.it/event/colloquium-phil-uttley/
LOCATION:OAR Monte Porzio Catone – aula Gratton\, Via Frascati 33\, Roma\, RM\, 00136\, Italia
CATEGORIES:Seminari
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200211T114500
DTEND;TZID=Europe/Rome:20200211T124500
DTSTAMP:20260408T023501
CREATED:20191018T072026Z
LAST-MODIFIED:20200122T132159Z
UID:6942-1581421500-1581425100@www.oa-roma.inaf.it
SUMMARY:The quest for observational evidence of the hierarchical formation process at the smallest galaxy scales
DESCRIPTION:I will present our ongoing project devoted to the search and study of satellites\, stellar streams\, and substructures around dwarf galaxies. Deep\, wide field imaging acquired with the Large Binocular Telescope and follow-up observations performed with the WFC3 on the Hubble Space Telescope provide evidence of multiple satellites associated with the very metal-poor star-forming dwarf galaxy DDO 68. This is a striking example of the few observed cases of hierarchical merging in action at the dwarf galaxy scales. To perform a systematic search of substructures around dwarf galaxies\, we have started a Strategic Program at the LBT\, named SSH (i.e. The Smallest Scales of Hierarchy Survey) to acquire deep\, wide-field imaging of a sample of 45 late-type dwarf galaxies located within 10 Mpc. The survey\, which is now close to completion\, will provide one of the first systematic observational studies of the hierarchical formation process down to very small galaxy scales. In this talk I will introduce SSH and discuss the results obtained so far.
URL:https://www.oa-roma.inaf.it/event/colloquium-francesca-annibali/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200218T114500
DTEND;TZID=Europe/Rome:20200218T124500
DTSTAMP:20260408T023501
CREATED:20190723T115244Z
LAST-MODIFIED:20200207T102810Z
UID:6539-1582026300-1582029900@www.oa-roma.inaf.it
SUMMARY:The interstellar medium at high redshift
DESCRIPTION:The gaseous content of galaxies is one of the key ingredients of galaxy evolution: It fuels star formation and nuclear activity\, and at the same time it is the main receiver of any feedback mechanism from these two processes. However\, we have only very limited knowledge of the gas content and of its physical properties in galaxies beyond the local universe. As a result\, no description of galaxy formation can be fully validated without a better understanding of 1) how much gas was available for star formation in different cosmic times; 2) how the star formation efficiency\, i.e.\, the capability of a galaxy to form stars from a given amount of gas\, evolve through cosmic history\, and which are physical conditions that governed this evolution; 3) what was the interplay between the interstellar medium\, star formation\, and nuclear activity. These questions are particularly critical at the very high redshifts (z>6\, when the universe was <1 Gyr old)\, where our census of galaxies is highly incomplete\, especially at the high-mass end\, and galaxies followed very different evolution according to the mass of their initial gas reservoir. In this talk I will present the results of various observational campaigns aimed at addressing these questions\, in particular by capitalizing on the unprecedented capabilities offered by the Atacama Large Millimeter Array and the Northern Extended Millimeter Array. These findings will guide the next generation of simulations and theoretical models\, thus marking a transformational step in our understanding of galaxy evolution.
URL:https://www.oa-roma.inaf.it/event/roberto-de-carli-colloquium/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200228T114500
DTEND;TZID=Europe/Rome:20200228T124500
DTSTAMP:20260408T023501
CREATED:20191016T143241Z
LAST-MODIFIED:20200127T143943Z
UID:6932-1582890300-1582893900@www.oa-roma.inaf.it
SUMMARY:colloquium - Roberta Zanin
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-roberta-zanin/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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