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DTSTART;TZID=Europe/Rome:20230606T113000
DTEND;TZID=Europe/Rome:20230606T123000
DTSTAMP:20260407T031743
CREATED:20230210T064844Z
LAST-MODIFIED:20230530T062309Z
UID:11289-1686051000-1686054600@www.oa-roma.inaf.it
SUMMARY:colloquium - Shuowen Jin: Massive galaxies and clusters in the making: Multi-wavelength study of optically-dark SMGs and galaxy overdensities at z>2.5
DESCRIPTION:Recent studies have revealed an important population of submillimeter galaxies (SMGs) that dropped out in deep optical surveys\, however their nature is still largely unknown. On the other hand\, high-z protoclusters are often suspected to be forming the local massive clusters\, while the evolutionary path is still elusive. Thus discovering more SMGs and galaxy overdensities towards high redshift are key to pushing our understanding of the formation of massive galaxies and structures. Here I report recent discoveries and study on the two topics from our team\, including (1) spectroscopic confirmation of a sample of optically-dark SMGs at z~4–6 using ALMA\, NOEMA and JWST; (2) detailed insight into a z=2.58 HST-dark SMG by synergy of JWST and ALMA data; (3) discovery of protoclusters and compact galaxy groups at z~3–5 using NOEMA\, ALMA and JWST. We found that most of the optically-dark SMGs have optically thick dust in FIR\, and they consist of s significant fraction of star-forming galaxies at z~4. By comparison with simulations\, we revealed that low-mass and compact galaxy groups most likely merge into single massive galaxies at lower-z\, i.e.\, “proto-massive galaxy”\, while only the most massive protoclusters are likely to evolve to local clusters.
URL:https://www.oa-roma.inaf.it/event/colloquium-showen-jin/
LOCATION:RM
CATEGORIES:Seminari
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230615T113000
DTEND;TZID=Europe/Rome:20230615T123000
DTSTAMP:20260407T031743
CREATED:20230523T071652Z
LAST-MODIFIED:20230529T084702Z
UID:11567-1686828600-1686832200@www.oa-roma.inaf.it
SUMMARY:colloquium - Stephane Courteau: Puzzles in Galaxy Structure
DESCRIPTION:Galaxies like our Milky Way can be described in terms of their structure\,\ndynamics\, and stellar populations. Some robust correlations between\ngalaxy structural properties such as stellar mass\, circular velocity\, and \nsize display surprisingly small scatter over many orders of magnitude\, \nhinting at well-regulated galaxy formation processes. A major challenge \nto understanding these scaling relations\, their tight scatter\, and ultimately \ngalaxy formation and evolution\, is the elusive interplay between visible \nand dark matter.  Among others\, the radial acceleration relation\, concept \nof “galaxy diversity”\, intrinsic scatter in galaxy scaling relations\, impact\nof supermassive black hole on galaxies\, and comparisons with numerical \nsimulations of galaxy formation are presented in this context.
URL:https://www.oa-roma.inaf.it/event/colloquium-stephane-courteau/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230620T113000
DTEND;TZID=Europe/Rome:20230620T123000
DTSTAMP:20260407T031743
CREATED:20230325T100149Z
LAST-MODIFIED:20230607T112933Z
UID:11372-1687260600-1687264200@www.oa-roma.inaf.it
SUMMARY:colloquium - Gabriele Cescutti: First results of the MINCE survey
DESCRIPTION:The struggle to find the most metal port stars in our Galaxy has produced an important bias in the observations and the intermediate metal-poor stars (-2.5<[Fe/H]< -1.5)\nhave been frequently overlooked. The missing information has consequences for the precise study of the chemical enrichment of our Galaxy\, in particular for\nwhat concerns neutron capture elements. Measuring at intermediate metallicity neutron capture elements (MINCE) aims to cover this gap\, gathering\nhigh quality spectra (high signal to noise and high resolution) of several hundred bright and metal poor stars\, manly from of our Galactic halo.\nIn this talk\, I show the results of the first sample of 42 stellar spectra for 40 different stars with the abundances of the elements up to europium. I also present\n the results for the hyperfine splitting effects in two metal-poor halo stars: the profiles of the barium lines in HD 4306 agree with an s-process composition whereas\nthose in HD 6268 have a different profile\, most likely linked to the presence of an r-process isotopic pattern. Therefore\, the lines of barium of HD 6268 and HD 4306\nseem to confirm the expectation that both r-process events and s-process contribution by rotating massive stars have polluted the ancient halo of our Galaxy.
URL:https://www.oa-roma.inaf.it/event/colloquium-gabriele-cescutti-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230627T113000
DTEND;TZID=Europe/Rome:20230627T123000
DTSTAMP:20260407T031743
CREATED:20230405T135705Z
LAST-MODIFIED:20230615T073616Z
UID:11379-1687865400-1687869000@www.oa-roma.inaf.it
SUMMARY:Colloquium - Kenneth Wong: An Independent Measurement of H0 from Lensed Quasars
DESCRIPTION:Strong gravitational lens systems with time delays between the multiple images are a powerful probe of cosmology\, particularly of the Hubble constant (H0).  This independent method is an important test of the recent tension between early-Universe and late-Universe measurements of H0.  The TDCOSMO project has measured H0 from lensed quasars using deep Hubble Space Telescope and AO imaging\, precise time delay measurements from dedicated monitoring observations\, a measurement of the velocity dispersion of the lens galaxies\, and a characterization of the mass distribution along the line of sight.  Assuming well-motivated physical profiles for the lens galaxies\, our latest results constrain H0 to be ~74 km/s/Mpc for a flat Lambda CDM cosmology\, with a precision of ~2%.  These results are consistent with independent determinations of H0 using type Ia supernovae calibrated by the distance ladder method\, and are in >4-sigma tension with the results of Planck CMB measurements\, hinting at possible new physics beyond the standard LCDM model and highlighting the importance of this independent probe.  Relaxing our assumptions on the form of the lens galaxy mass profiles and only allowing kinematic constraints\, we can constrain H0 to ~8% precision.  Including information from external data sets can improve the precision to ~5%.  Future observations to increase the sample size and control systematic uncertainties will be key to resolving the current tension in H0.
URL:https://www.oa-roma.inaf.it/event/colloquium-kenneth-wong/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
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