论文标题
带有中央核心的矮星系中的牛顿动力学（MOND）重力
Dwarf galaxies with central cores in modified Newtonian dynamics (MOND) gravity
论文作者
论文摘要
某些矮星系在所有半径上都在蒙迪亚体制内，即观察到的重子提供的重力加速度始终低于$ g_†\ simeq 1.2 \ simeq 1.2 \ times 10^{ - 10} { - 10} \，{\ rm m m \ \，s^，s^{ - s^{-2 {-2} $。从某种意义上说，这些矮人的星系经常显示核心，假设牛顿的重力解释其旋转曲线，总密度曲线$ρ（r）$呈现一个中央高原或{\ em core}（$ d \ logρ/d \ log log r \ r \ r \ rightarrow 0 $ r \ r \ rightarrow 0 $ 0 $）。在这里，我们表明，在Mond Gravity下，该核心的存在意味着BARYON含量的密度$ g _ {\ rm bar} $必须向重力潜力的中心降低（$ g _ {\ rm bar} \ rightArrow 0时$ r \ righatRow 0 $ 0 $）。这种降落向中央区域的降落既不观察到也没有出现在MOND重力后星系形成的数值模拟中。我们分析了MOND以及可能的解决方法的问题。
Some dwarf galaxies are within the Mondian regime at all radii, i.e., the gravitational acceleration provided by the observed baryons is always below the threshold of $g_†\simeq 1.2\times 10^{-10}\,{\rm m\,s^{-2}}$. These dwarf galaxies often show cores, in the sense that assuming Newton's gravity to explain their rotation curves, the total density profile $ρ(r)$ presents a central plateau or {\em core} ($d\log ρ/d\log r\rightarrow 0$ when $r\rightarrow 0$). Here we show that under MOND gravity, the existence of this core implies a baryon content whose density $g_{\rm bar}$ must decrease toward the center of the gravitational potential ($g_{\rm bar}\rightarrow 0$ when $r\rightarrow 0$). Such drop of baryons toward the central region is neither observed nor appears in numerical simulations of galaxy formation following MOND gravity. We analyze the problem posed for MOND as well as possible workarounds.
