论文标题
蜻蜓边缘星系调查的恒星光环
Stellar halos from The Dragonfly Edge-on Galaxies Survey
论文作者
论文摘要
我们介绍了Draginfly Edge-On Galaxies调查（DEGS）的主要结果，该调查是对附近十二个恒星光环（$ d <25 $ MPC）带有蜻蜓远摄阵列的边缘星系的探索。这些星系的边缘方向使它们的恒星光环探索以最小的遮挡或与明亮的圆盘灯混淆或混乱。样品中的星系范围跨越了一系列恒星质量，从$ 10^{9.68} -10^{10.88} m_ \ odot $。我们确认，在不太庞大的螺旋星系中也发现了以前在银河系星系中看到的恒星光环质量分数。恒星光环质量分数的散射很大，但是当恒星光环质量分数与总恒星质量之间存在显着的正相关，而前者的测量超过了五个半质量半径。尽管观察到的恒星光环馏分似乎比这些模拟的预期低一些。
We present the primary results from the Dragonfly Edge-on Galaxies Survey (DEGS), an exploration of the stellar halos of twelve nearby ($d < 25$ Mpc) edge-on disc galaxies with the Dragonfly Telephoto Array. The edge-on orientation of these galaxies allows their stellar halos to be explored with minimal obscuration by or confusion with the much brighter disc light. Galaxies in the sample span a range of stellar masses from $10^{9.68} - 10^{10.88} M_\odot$. We confirm that the wide range of stellar halo mass fractions previously seen for Milky Way-mass galaxies is also found among less massive spiral galaxies. The scatter in stellar halo mass fraction is large but we do find a significant positive correlation between stellar halo mass fraction and total stellar mass when the former is measured beyond five half-mass radii. Reasonably good agreement is found with predictions from cosmological hydrodynamical simulations, although observed stellar halo fractions appear to be somewhat lower than expected from these simulations.
