Shaking Up Debris Disks
Using a combination of numerical and analytic techniques, the authors of this paper try to answer the question: what does a passing star do to a debris disk?
Photometric Redshifts and the Galaxy Luminosity Function
Can photometric redshifts be used to probe the galaxy luminosity function with the same accuracy as spectroscopic redshifts? This paper’s authors say the answer is yes.
Can the CMB Alone Provide Evidence for Dark Energy?
Using the WMAP power spectrum together with weak lensing data from the Atacama Cosmology Telescope, the authors of this paper show that a cosmological model including a dark energy component is required to fit the Cosmic Microwave Background data.
Investigating a “Cosmic Train Wreck”
In this paper, the authors describe a system of three supermassive black holes interacting on kpc scales, and use their result to estimate the frequency of such interactions.
How do we estimate black hole masses (and what happens if we get them wrong)?
In this paper, the author examines what happens to the quasar mass-luminosity relationship if the method used to calculate the black hole masses is biased, as well the physical implications of different corrections that have been suggested.