Journal Club Public Talk：

　　报告人：张大力

　　报告题目：The detection of satellites of the milky way

　　报告摘要：We report sixteen new ultra-faint dwarf galaxy candidates in two year of optical imaging data from the Dark Energy Survey (DES). Each system is identified as a statistically significant over-density of individual stars consistent with the expected isochrone and luminosity function of an old and metalpoor stellar population. The objects span a wide range of absolute magnitudes (MV from -2.2 mag to -7.4 mag), physical sizes (10 pc to 181 pc), and heliocentric distances(25 kpc to 330 kpc). Based on the low surface brightnesses, large physical sizes, and/or large Galactocentric distances of these objects, several are likely to be new ultra-faint satellite galaxies of the Milky Way and/or Magellanic Clouds. Our model predicts that the full sky may hold 100 ultra-faint galaxies with physical properties comparable to the DES satellites and that 20~30% of these would be spatially associated with the Magellanic Clouds.

　　参考文献：arXiv:1508.03622v2[astro-ph.GA]

          　　 arXiv:1503.02584v2[astro-ph.GA]

　　时间：2017年01月03日12:15－1:45pm

　　地点：紫台619会议室