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Constraints on the cosmological coupling of black holes from Gaia
Rene Andrae, Kareem El-Badry
Recent work has suggested that black holes (BHs) could be cosmologically coupled to the accelerated expansion of the universe, potentially becoming a candidate for dark energy. Thi…
Assessment of stochastic and deterministic models of 6304 quasar lightcurves from SDSS Stripe 82
Rene Andrae, Dae-Won Kim, Coryn A. L. Bailer-Jones
The optical light curves of many quasars show variations of tenths of a magnitude or more on time scales of months to years. This variation often cannot be described well by a simp…
Only marginal alignment of disc galaxies
Rene Andrae, Knud Jahnke
Testing theories of angular-momentum acquisition of rotationally supported disc galaxies is the key to understand the formation of this type of galaxies. The tidal-torque theory tr…
Quantifying galaxy shapes: Sersiclets and beyond
Rene Andrae, Peter Melchior, Knud Jahnke
Parametrising galaxy morphologies is a challenging task, e.g., in shear measurements of weak lensing or investigations of galaxy evolution. The huge variety of morphologies require…
Parametrising arbitrary galaxy morphologies: potentials and pitfalls
Rene Andrae, Knud Jahnke, Peter Melchior
We demonstrate that morphological observables (e.g. steepness of the radial light profile, ellipticity, asymmetry) are intertwined and cannot be measured independently of each othe…
The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
Mauricio Cisternas, Knud Jahnke, Katherine J. Inskip +21
What is the relevance of major mergers and interactions as triggering mechanisms for active galactic nuclei (AGN) activity? To answer this longstanding question, we analyze 140 XMM…