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Dos and don'ts of reduced chi-squared
Rene Andrae, Tim Schulze-Hartung, Peter Melchior
Reduced chi-squared is a very popular method for model assessment, model comparison, convergence diagnostic, and error estimation in astronomy. In this manuscript, we discuss the p…
Error estimation in astronomy: A guide
Rene Andrae
Estimating errors is a crucial part of any scientific analysis. Whenever a parameter is estimated (model-based or not), an error estimate is necessary. Any parameter estimate that…
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…
Soft clustering analysis of galaxy morphologies: A worked example with SDSS
Rene Andrae, Peter Melchior, Matthias Bartelmann
Context: The huge and still rapidly growing amount of galaxies in modern sky surveys raises the need of an automated and objective classification method. Unsupervised learning algo…