ELFT HÍRADÓ

[vidakris AT konkoly.hu]

Szemináriumi meghívó / Invitation to a seminar
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CSFK CSI SZEMINÁRIUM / KONKOLY OBSERVATORY SEMINAR

Date: Jun 05 (Thursday) 14:00


Sándor Frey (Konkoly Observatory; Hungary): 

Precise astrometry in the service of extragalactic astrophysics

For centuries, astronomy was essentially synonymous with astrometry, i.e., 
measuring positions of celestial objects. Today, we are witnessing a 
renaissance in astrometry. Measurements with sub-milliarcsecond precision are 
now routinely achieved in both the radio and optical regimes. For many 
decades, very long baseline interferometry (VLBI) in the radio band was the 
only method capable of delivering such high-precision astrometric data for 
certain extragalactic objects, particularly radio-loud active galactic nuclei 
(AGN). The launch of the Gaia spacecraft in 2013, and its operations 
continuing until early 2025, marked a turning point. For the first time, it 
became possible to obtain sub-milliarcsecond astrometry for a huge number of 
optically relatively faint AGN. This development opened up exciting 
opportunities to combine radio and optical astrometric data, enabling new 
insights into AGN astrophysics. In this talk, I will review some key results 
in this field, with an emphasis on 
 our own contributions over the past decade or so. I will also highlight 
promising directions for future research in applications of precise 
astrometric measurements.



https://konkoly.hu/k-szeminariumok

The seminar will be held live in the Detre hall with audience, but also 
streamed online via Zoom. If you are unable to attend the presentation in 
person, you can join us via this link
https://us06web.zoom.us/j/82806911982?pwd=SVZpT0syQ1J6dHBvSkF4N2dXNEQ0dz09
or the meeting ID: 828 0691 1982 and passcode: 206265



Everyone is welcome!

Krisztián Vida, Ramon Brasser
organizers
https://konkoly.hu/k-szeminariumok