Author

J. Biedermann

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Preprint Sep 2026

Potential binary supermassive black holes in Markarian 231 as a scientific case for the spectropolarimeter POLLUX

It is now widely accepted that a supermassive black hole (SMBH) resides in the core of nearly every galaxy. Within the context of mergers of galaxies, the central SMBHs from each system should form a gravitationally bound binary system. Given the frequency of galaxy mergers throughout cosmic time, the existence of such...

J. Biedermann, F. Marin, C. Neiner et al. · 0 citations

Open access Sep 2026

Optical spectropolarimetry of extreme Hα line profiles in seven active galactic nuclei

Some active galactic nuclei (AGNs) are known to show extremely asymmetric broad Balmer lines, with their main peak redshifted or blueshifted by thousands of km s -1 , severely challenging our understanding of the standard AGN paradigm. We wanted to explore the causes of such asymmetric features by carrying out a spectr...

J. Biedermann, F. Marin, D. Hutsemékers et al. · Astronomy & Astrophysics · 0 citations

Preprint Sep 2026

Probing binary supermassive black hole in quasars tough spectropolarimetry

Nearly all galaxies are believed to host a supermassive black hole at their center. In the context of galaxy mergers, the SMBHs from the progenitor galaxies are expected to form a bound binary system. Given the high frequency of such mergers throughout cosmic time, binary SMBHs should be relatively common in active gal...

J. Biedermann, F. Marin · 0 citations