http://arxiv.org/abs/1810.09721
LIGO has detected gravitational waves from massive binary black holes mergers. In order to explain the origin of such massive stellar black holes, extreme metal poor stars including first stars are focused on. However, black holes do not have the information of the metallicity. In order to check the metallicity dependence of the black hole formation, we focus on the black hole-main sequence binary (BH-MS) and the astrometry observatory $Gaia$. Using the binary population synthesis method, we find that $Gaia$ can detect $\sim200$ BH-MSs whose metallicity is $Z_{\odot}$ and $\sim400$ BH-MSs whose metallicity is $0.1Z_{\odot}$. Using the spectroscopic observation with 4-m class telescopes such as Anglo-Australian Telescope, Mayall telescope, and Kyoto university 3.8m telescope, we can check the metallicity of BH-MSs. The metallicity dependence of the black hole formation might be revealed by the astrometry and spectroscopic observation.
T. Kinugawa and M. Yamaguchi
Wed, 24 Oct 18
16/75
Comments: 4pages, 4figures. comments welcome
You must be logged in to post a comment.