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      Metallicity dependence of black hole main sequence binaries detectable with Gaia

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          Abstract

          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.

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          Author and article information

          Journal
          23 October 2018
          Article
          1810.09721
          dd127048-4382-4ed2-bd24-15564657d596

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          4pages, 4figures. comments welcome
          astro-ph.HE astro-ph.SR

          High energy astrophysical phenomena,Solar & Stellar astrophysics
          High energy astrophysical phenomena, Solar & Stellar astrophysics

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