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Detection of quasars in the time domain
Matthew J. Graham, S. G. Djorgovski, Daniel J. Stern +2
The time domain is the emerging forefront of astronomical research with new facilities and instruments providing unprecedented amounts of data on the temporal behavior of astrophys…
Intervening Mg II absorption systems from the SDSS DR12 quasar spectra
Srinivasan Raghunathan, Roger G. Clowes, Luis E. Campusano +3
We present the catalogue of the Mg II absorption systems detected at a high significance level using an automated search algorithm in the spectra of quasars from the twelfth data r…
Ultraviolet Fe II Emission in Fainter Quasars: Luminosity Dependences, and the Influence of Environments
Roger G. Clowes, Lutz Haberzettl, Srinivasan Raghunathan +5
We investigate the strength of ultraviolet Fe II emission in fainter quasars compared with brighter quasars for 1.0 <= z <= 1.8, using the SDSS (Sloan Digital Sky Survey) DR7QSO ca…
A Population of Short-Period Variable Quasars from PTF as Supermassive Black Hole Binary Candidates
M. Charisi, I. Bartos, Z. Haiman +5
Supermassive black hole binaries (SMBHBs) at sub-parsec separations should be common in galactic nuclei, as a result of frequent galaxy mergers. Hydrodynamical simulations of circu…