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Lecture

Sackler Lecture 2017: Dynamical Processes in the Galactic Centre

  • Prof. Re’em Sari
Date
Friday 22 September 2017
Time
Location
Oort
Niels Bohrweg 2
2333 CA Leiden
Room
Sitterzaal

Leiden Observatory has the pleasure of inviting you to attend the 19­th Raymond and Beverly Sackler Lecture.

The 2017 Sackler Lecture will be delivered by Prof. Re’em Sari from the Hebrew University Jerusalem. The title of his lecture will be: Dynamical Processes in the Galactic Centre.

Afterwards there will be a reception in the hall of the J.H. Oort Building.

About the speaker

Prof. Sari received his PhD in 1998 from the Hebrew University in Jerusalem. Afterwards he moved to Caltech (Pasadena, CA), where he first held a Sherman Fairchild Senior Research Fellowship before becoming Associate Professor of Astrophysics and Planetary Science in 2003. Finally, in 2007 he went back to his country of origin and the Hebrew University where he is currently Professor in Astrophysics. Prof. Sari is a theoretician who has significantly contributed to the advance of an impressive broad range of topics from Solar system objects over extrasolar planets and star dynamics to extreme high energy phenomena such as gamma ray bursts and supernovae.

About the lecture

A variety of dynamical processes shapes the density of stars and gas in our Galactic center. We emphasize the role of binary stars dissolving in the tidal field of the super massive black hole. These are thought to produce hypervelocity stars, which are observed to escape our Galaxy. We show that they also play a role in setting the stellar cusp around the central black hole. Stars emitting gravitational waves spiral slowly toward the black hole, and once close enough transfer mass to it.We discuss the gravitational wave signal emitted and show that it may reflect internal properties of the star. Dissolving binaries may influence the rate of such events as compared to more violent stellar deaths in tidal disruption events.

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