论文标题
通过重力微透镜在银河光环中搜索黑洞
Search for Black Holes in the Galactic Halo by Gravitational Microlensing
论文作者
论文摘要
质量大于$ 10 m _ {\ odot} $的黑色孔状物体，如引力天线所发现的，可以产生长时间（几年）的重力微透镜效应。另外考虑的是，以前的微透镜调查对此类事件不敏感，因为它们的持续时间有6 - 7年。我们将光曲线从EROS-2和MACHO调查到大型麦哲伦云（LMC）结合在一起，以创建一个1410万星的联合数据库，覆盖了10.6年的总持续时间，并通过4个宽通带测量通量。我们在此扩展光曲线的目录中搜索了多年的微透镜事件，其中仅一项调查观察到了241万光曲线。我们的分析结合了EROS的先前分析，表明，质量在$ 10^{ - 7} $和$ 200 m _ {\ odot} $之间的紧凑对象不能构成超过$ \ sim 20 \％的标准光环总质量（$ 95 \％$ cl）。我们还排除了光环的$ \ sim 50 \％$由黑洞（BH）制成，比$ 1000 m _ {\ odot} $轻（BH）。
Black hole-like objects with mass greater than $10 M_{\odot}$, as discovered by gravitational antennas, can produce long time-scale (several years) gravitational microlensing effects. Considered separately, previous microlensing surveys were insensitive to such events because of their limited duration of 6-7 years. We combined light curves from the EROS-2 and MACHO surveys to the Large Magellanic Cloud (LMC) to create a joint database for 14.1 million stars, covering a total duration of 10.6 years, with fluxes measured through 4 wide passbands. We searched for multi-year microlensing events in this catalog of extended light curves, complemented by 24.1 million light curves observed by only one of the surveys. Our analysis, combined with previous analysis from EROS, shows that compact objects with mass between $10^{-7}$ and $200 M_{\odot}$ can not constitute more than $\sim 20\%$ of the total mass of a standard halo (at $95\%$ CL). We also exclude that $\sim 50\%$ of the halo is made of Black Holes (BH) lighter than $1000 M_{\odot}$.
