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DTSTART;TZID=Europe/Rome:20190212T114500
DTEND;TZID=Europe/Rome:20190212T124500
DTSTAMP:20260506T042140
CREATED:20181010T170838Z
LAST-MODIFIED:20181010T170838Z
UID:4438-1549971900-1549975500@www.oa-roma.inaf.it
SUMMARY:Colloquium - Marianna Torelli
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-marianna-torelli/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190212T114500
DTEND;TZID=Europe/Rome:20190212T124500
DTSTAMP:20260506T042140
CREATED:20181010T170838Z
LAST-MODIFIED:20190122T090137Z
UID:4775-1549971900-1549975500@www.oa-roma.inaf.it
SUMMARY:Stellar Populations in Local and high redshift Universe
DESCRIPTION:Synthetic stellar libraries are quite popular to constrain the stellar pop-\nulations (age and metallicity distribution) of unresolved systems like high redshift galaxies.\nHowever\, they are typically based on theoretical Spectral Energy Distributions (SEDs).\nIt is important to build up empirical synthetic stellar li-\nbraries\, calibrated on local systems and\ncovering a broad range in ages (globular clusters\, old open clusters)\,\nchemical compositions (iron\, alpha\, CNO) and dynamical properties (nearby\ndwarf galaxies)\, able to improve our SED fitting codes to deeply investigate\nhigh redshift galaxies.\nTo do that\, I am taking advantages of a sample of 65 Galactic globular clus-\nters (GGCs) for which we have accurate and homogeneous optical photometry\nbased on space (ACS at HST\, innermost regions) and ground-based\n(up to the tadial radius).\nIn particular\, I will present the results on the study of the Horizontal Branch\n(HB) morphology for 64 GGCs in our sample.\nI will introduce a very new photometric morphology index based\non the cumulative density function of the stars along the HB\,\nuseful to investigate the well known “second\nparameter problem” affecting age estimations and so\, stellar libraries.\nI will also discuss the results of the analysis on galaxy\nevolution through the Galaxy Stellar Mass Function (GSMF) up to redf-\nshift 4\, obtained combining all the five CANDELS fields (GOODS-South\,\nGOODS-North\, EGS\, COSMOS\, UDS)\, the Frontier Fields Parallels (Abell 2744\,\nMACSJ0416\, MACSJ0717\, MACSJ1149) and the Ultravista/COSMOS\nfield. Stellar masses have been estimated fitting the photometry to syn-\nthetic models: these surveys are characterized by multi-wavelength (deep\noptical/near-infrared/mid-infrared) coverage (CANDELS)\, very high limiting magnitudes\n(Frontier Fields) and large areas (UltraVista)\, allowing to explore the GSMF\nfrom low masses to the high-mass end.
URL:https://www.oa-roma.inaf.it/event/colloquium-marianna-torelli-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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