Observational constraints on supermassive dark stars
Östlin, Göran; Rydberg, Claes-Erik; Zackrisson, Erik; Mellema, Garrelt; Scott, Pat; Iocco, Fabio; Sivertsson, Sofia; Iliev, Ilian T.; Shapiro, Paul R.
Sweden, France, United Kingdom, United States
Abstract
Some of the first stars could be cooler and more massive than standard stellar models would suggest, due to the effects of dark matter annihilation in their cores. It has recently been argued that such objects may attain masses in the 104-107Msolar range and that such supermassive dark stars should be within reach of the upcoming James Webb Space Telescope. Notwithstanding theoretical difficulties with this proposal, we argue here that some of these objects should also be readily detectable with both the Hubble Space Telescope and ground-based 8-10 m class telescopes. Existing survey data already place strong constraints on 107Msolar dark stars at z ~ 10. We show that such objects must be exceedingly rare or short lived to have avoided detection.