ΕΘΝΙΚΟ ΑΣΤΕΡΟΣΚΟΠΕΙΟ ΑΘΗΝΩΝ

Διαδικτυακό σεμινάριο του ΙΑΑΔΕΤ με θέμα: Search for MIlli-LEnses (SMILE) to discriminate between dark matter models.

Την Τετάρτη 25.05.2022 θα πραγματοποιηθεί το επόμενο διαδικτυακό σεμινάριο του ΙΑΑΔΕΤ με θέμα:
Search for MIlli-LEnses (SMILE) to discriminate between dark matter models.
Ομιλήτρια η: Dr. Carolina Casadio, FORTH Institute of Astrophysics
IAASARS WEB Seminar on May 25th at 12:00
Projects aimed at characterising dark matter properties make use of very different approaches. One such approach is to look for strong gravitational lens systems. Gravitational lensed images with angular separation on milli-arcsecond scales probe gravitational lens systems where the lens is a compact object with mass in the range 10^6-10^9 solar masses, i.e a supermassive compact object (SMCO). This mass range is particularly critical for the widely accepted cosmological model, which predicts many more DM halos on sub-galactic scales (< ~ 10^11 solar masses) than currently observed. The most direct way to explore these small angular scales is through the high-resolution of radio Very Long Baseline Interferometry (VLBI). We perform a pilot search, using the Astrogeo VLBI FITS image database and collecting multi-frequency, multi-epoch VLBI data of 13828 individual sources. We identified 40 milli-lens candidates, which have been followed-up with multi-frequency European VLBI Network (EVN) observations. Performing a similar search in a complete sample of ~ 5000 sources would allow us to constraint the abundance of SMCO in the universe with more than an order of magnitude better precision than in previous studies, and to ultimately reject many currently viable DM models.
Meeting ID: 826 3367 1001