Seminars

Pasquale Panuzzo 

(CNRS - Observatoire de Paris)

24 October 2024, 11:30, Aula Jappelli 

Gaia BH3: a 33 Solar Masses dormant BH discovered in Gaia preliminary astrometry

The validation activities in preparation of the Gaia DR4 resulted in the discovery of a binary system, hosting a dormant stellar black hole with an exceptional mass. Black holes of these masses have been detected only in BH mergers in distant galaxies via gravitational waves. The fact that the stellar companion is an old very metal-poor giant of the Galactic halo supports the scenario that the progenitors of the high-mass BHs detected by gravitational-wave telescopes are metal-poor massive stars. The Galactic orbit of the system and its metallicity indicate that it belongs to the ED-2 stream, likely a globular cluster accreted by the Milky Way, giving hints on the formation mechanism of this binary system. The discovery is an example of the impressive impact of the Gaia mission on all branches of stellar astrophysics. We will describe the discovery of Gaia BH3, its implications, and report on results obtained by the community on this astonishing object.

Join Zoom Meeting

https://unipd.zoom.us/j/85273198731?pwd=V1ZiNE9ZWUN4ZTdIUzJsTFo0Z3U2Zz09

Meeting ID: 852 7319 8731

Passcode: 208186

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Next scheduled seminars:

October 31st - Andrea Pallottini (Scuola Normale Superiore - Pisa) 

November 11th - Mario Pasquato (INAF IASF-Milano)

and many more! 

HIGH-PROFILE Colloquia: 

December 12th - Thomas BENSBY (University of Lunds) 

January 16th - Adriano FONTANA (INAF) 

February 13th - Claudia CICONE (University of Oslo) 

March 13th - Sara ELLISON (University of Victoria) 

CONTAMINATION Seminars: 

February 6th - Samuele NEGRO (Neurobiologia - UNIPD) 

March 27th - Giacomo DE ANGELIS (INFN)