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Event ID:  37053
Contact Name:  Lauri Juhan Liivamägi
Contact Email:  juhan.liivamagi@ut.ee
Contact Phone: 
Organization:  Tartu Observatory, University of Tartu
Event Web Site:  https://button.ut.ee/b/wir-ch7-z4w
Dates:  7th October 2020 to 10th October 2020
Physical Event:  No
Type:  Other
Start/End Type:  Starts During WSW
Country:  Estonia
State/Province:  Tartumaa
City: 
Address: 
Location:  Tõravere
Event Name:  Seminar: The Cosmic Ballet: spinning in the web
Event Description:  Tartu Observatory gladly invites everyone to an astronomy seminar about the cosmic ballet on Wednesday, October 7 at 3 PM (UTC +3)! The presenter will be Junior Research Fellow Punyakoti Ganeshaiah Veena. All the celestial objects, from small asteroids and planets to large galaxies and even the long filaments of the cosmic web are rotating. The origin of rotation is yet to be fully understood, especially in the context of galaxies and their dark matter haloes. According to the classical tidal torque theory, in the early Universe, as matter began to clump together, the resulting anisotropic distribution of matter torqued up proto-galaxies. Simultaneously, the matter overdensities collapsed to form the large-scale filaments, clusters, walls and voids of the cosmic web that we see today. As a result, we expect a correlation between galaxy spin and the cosmic web. During the talk, Veena will discuss the role of the cosmic web environment in establishing the rotation of haloes and galaxies using large cosmological simulations. She will show that haloes in filaments are in general spinning faster than in other web components. She will also present the correlations between the spin-axis of haloes/galaxies with the orientation of the cosmic filaments that they are growing in and show how these trends evolve with cosmic time and filament properties. Punyakoti Ganeshaiah Veena is a junior research fellow at Tartu Observatory (University of Tartu) and a doctoral student at the University of Groningen. She will be defending her thesis on the seminar topic in October. Image of the event: A slice from the Millennium-II simulation showing the growth of the cosmic web from a redshift of 6.2 to 0. It also highlights the hierarchical growth of structures with small objects forming first that merge to grow into more massive structures. Image: Boylan-Kolchin M., Springel V., White S. D. M., Jenkins A., Lemson G., 2009, MNRAS, 398, 1150.
Promotional Image: 
Report on the Results:  Punyakoti Ganeshaiah Veena presented her results about the spinning of galaxies in the cosmic web. A discussion followed, enabling attendees to ask questions and express thoughts about the topic. At the World Space Week event, presenter Veena provided attendees with valuable new information for which she also received formal recognition a few days after the event, as a result of a successful PhD dissertation defence on the same topic. The event can also be considered a successful international co-operation: it was organized by Tartu Observatory in Estonia, and the presenter was supervised by researchers in both Estonia and the Netherlands, as she later received a degree from the University of Groningen.
Attendance:  20
Attendance is Unique:  Yes
Media Impressions:  350
Media Impressions are Unique:  Yes


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