Seminari


Seminars are organized jointly by the Trieste Astronomical Observatory (INAF/OATS) and the Astronomy Unit of the Physics Dept. of the Trieste University (UNI/TS). 

 

Wednesday, July 14th at 11:30
 
 
1st speaker: Priyanka Singh 
Title: Post-starburst galaxies in dense cluster environments
 
 
The quenching of a star-forming (SF) galaxy to a quiescent one is one of the major transformations that a galaxy undergoes during its life-cycle. However, the primary routes of galaxy quenching in different density environments are still a matter of debate. Post-starburst galaxies (PSBs) are formed during one such popular quenching route where a burst of star-formation is followed by a rapid quenching. Therefore, they hold crucial information about the evolution of galaxies. In today's seminar I will present the latest updates from our ongoing project where we constrain the PSB galaxy density and its evolution in the dense cluster environment. As a by-product of the analysis, we also have constraints on the distribution of quiescent and SF galaxies as a function of redshift and cluster-centric radii. We perform spectral energy distribution (SED) fitting analysis on galaxies in and around ~280 SPT-SZ cluster sample spanning a redshift range 0.3-0.7, therefore utilising one of the largest samples of galaxy clusters in a wide enough redshift range to allow the redshift evolution for galaxy population studies. We use optical photometry from Dark Energy Survey (DES) Year-3 and near infrared (IR) photometry from VISTA Hemisphere Survey (VHS) with an overlapping 4,500 square degrees multi-wavelength coverage. This project complements many other contemporary studies based on deeper data, however, lacking a large statistical sample. Finally, this project would contribute substantially in improving our understanding of when, where and how different quenching mechanisms and environmental effects impact the properties of the galaxies.
 
 
2nd speaker: Marta Spinelli
Title: Chasing Neutral Hydrogen: an Intensity Mapping view of the large scale structure

Radio telescopes such as MeerKAT, and in the future SKA, can map the spatial distribution of the low redshift cosmic neutral hydrogen using Intensity Mapping techniques for the 21 cm line. These measurements can unveil the underlying large-scale structure of the Universe and contribute in a fundamental way to constrain cosmological parameters.
A key challenge is the subtraction of the bright foregrounds, orders of magnitude stronger than the 21cm signal. It is, therefore, crucial to assess through simulations the performance of foreground cleaning in realistic scenarios, improving both the sky model and the instrument characterization.
In this talk, I will present the current status of an Intensity Mapping survey with MeerKAT in single-dish mode. I will also discuss the effort, carried out with the SKA Intensity Mapping Focus Group to construct a realistic mock data cube for both MeeKAT and the SKA, and to test and compare different foreground cleaning methods.
 
Google Meet link:  meet.google.com/zfy-mtgs-tpc
 
 
 
 
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Gabriella Schiulaz and Simonetta Fabrizio: This email address is being protected from spambots. You need JavaScript enabled to view it.

Should you wish to give a talk at OATS, please feel free to contact the organizers.
Should you be one of our next speakers and need any travel and/or logistic information, please contact our Seminar logistic.
Please find here the Speaker's Vademecum, in preparation for your coming visit at OATS.

 

Something to keep in mind whenever you talk and write: Science is getting harder to read