| Description: | Many of you will remember the late Seungyoup Chi, a PhD student from Korea studying at the Kapteyn Institute and ASTRON. Tragically, Seungyoup was taken from us in January 2011, in the run-up to completing his thesis. Recently, some of the research Seungyoup spearheaded in the area of deep, high resolution observations of faint radio sources in Hubble Deep Field North (HDF-N) was finally published in Astronomy & Astrophysics.
The paper describes very sensitive, wide-field VLBI observations with a worldwide network of radio telescopes that uncovers black holes residing in the centre of dust obscured galaxies (see image above). In some cases, the amount of dust is so large, that even x-rays from the accreting black holes are absorbed in these systems. As Seungyoup's thesis supervisors, Prof. Peter Barthel and myself are very happy to see these results finally in press - much credit goes to Peter who was able to complete the paper even though much of Seungyoup's original data were no longer available to us. Seungyoup's parents and friends are very proud that the paper is also specially highlighted on the A&A web pages, as one of the key contributions to volume 550
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