29 research outputs found
Early metal enrichment in high-redshift quasars
Quasars are powerful systems whose spectrum is rich of metal features that
allow us to investigate the chemical evolution of galaxies at very high
redshift, even close to the reionization epoch. I review the main observational
constraints on the metallicity of quasars host galaxies at high redshift and
discuss the implications and issues for models of galaxy evolution in the early
universe.Comment: 8 pages, invited review at the workshop "Probing Stellar Populations
out to the Distant Universe
The CHilean Automatic Supernova sEarch (CHASE)
The CHASE project started in 2007 with the aim of providing young southern
supernovae (SNe) to the Carnegie Supernova Project (CSP) and Millennium Center
for Supernova Studies (MCSS) follow-up programs. So far CHASE has discovered 33
SNe with an average of more than 2.5 SNe per month in 2008. In addition to the
search we are carrying out a follow-up program targeting bright SNe. Our fully
automated data reduction allows us to follow the evolution on the light curve
in real time, triggering further observations if something potentially
interesting is detectedComment: 4 pages, 2 figures, conference proceedin
Solar analogues in open clusters: The case of M67
Solar analogues are fundamental targets for a better understanding of our Sun
and our Solar System. Usually, this research is limited to field stars, which
offer several advantages and limitations. In this work, we present the results
of a research of solar twins performed for the first time in a open cluster,
namely M67. Our analysis allowed us to find five solar twins and also to derive
a solar colour of (B-V)0=0.649+/-0.016 and a cluster distance modulus of
9.63+/-0.08. This study encourages us to apply the same method to other open
clusters, and to do further investigations for planet search in the solar twins
we find.Comment: 4 pages, 2 figures; Proceedings of the conference "Probing Stellar
Populations out to the Distant Universe", Cefalu' (Italy), September 7 - 19,
2008. To be published in the AIP Conf. Proc. Serie
The CAESAR project for the ASI space weather infrastructure
This paper presents the project Comprehensive spAce wEather Studies for the ASPIS prototype Realization (CAESAR), which aims to tackle the relevant aspects of Space Weather (SWE) science and develop a prototype of the scientific data centre for Space Weather of the Italian Space Agency (ASI) called ASPIS (ASI SPace Weather InfraStructure). To this end, CAESAR involves the majority of the SWE Italian community, bringing together 10 Italian institutions as partners, and a total of 92 researchers. The CAESAR approach encompasses the whole chain of phenomena from the Sun to Earth up to planetary environments in a multidisciplinary, comprehensive, and unprecedented way. Detailed and integrated studies are being performed on a number of well-observed “target SWE events”, which exhibit noticeable SWE characteristics from several SWE perspectives. CAESAR investigations synergistically exploit a great variety of different products (datasets, codes, models), both long-standing and novel, that will be made available in the ASPIS prototype: this will consist of a relational database (DB), an interface, and a wiki-like documentation structure. The DB will be accessed through both a Web graphical interface and the ASPIS.py module, i.e., a library of functions in Python, which will be available for download and installation. The ASPIS prototype will unify multiple SWE resources through a flexible and adaptable architecture, and will integrate currently available international SWE assets to foster scientific studies and advance forecasting capabilities
The effectiveness of the Brisbane City Council incentive scheme for high end industrial users
Late-, Post-Hercynian calcalkaline mafic dyke swarms ("Appinites") of the western south alpine basement (Italy-Switzerland)
Correlation of solar activity proxy with solar wind dynamic pressure in the last five solar cycles
Solar variability related to the magnetic activity can be quantified using synthetic indices (e.g., sunspots number) or physical ones (e.g., chromospheric proxies). To connect solar surface variability and its features in the near-Earth, we use Ca II K index and solar wind OMNI data in the time interval between 1965 and 2019, which almost entirely covers the last 5 solar cycles. Using long-term averaged data, anti-correlation between Ca II K index and solar wind dynamic pressure at 1 AU has been found during solar cycles 20 and 21, while this relation seems to
change over the last 3 solar cycles
I contratti collettivi nazionali di lavoro del personale della sanitĂ privata della sanitĂ religiosa e dell'UNEBA
Correlation of solar activity proxy with solar wind dynamic pressure in the last five solar cycles
Solar variability related to the magnetic activity can be quantified using synthetic indices (e.g., sunspots number) or physical ones (e.g., chromospheric proxies). To connect solar surface variability and its features in the near-Earth, we use Ca II K index and solar wind OMNI data in the time interval between 1965 and 2019, which almost entirely covers the last 5 solar cycles. Using long-term averaged data, anti-correlation between Ca II K index and solar wind dynamic pressure at 1 AU has been found during solar cycles 20 and 21, while this relation seems to change over the last 3 solar cycles