論文摘要

Distinguishing galaxies and young stellar objects in multi-dimensional magnitude space

[ Poster ]

Kuan-Hsien Wu (NTHU), Meng-Zhe Yang, Shih-Ping Lai(NTHU)

Distinguishing Galaxies and Young Stellar Objects (YSOs) from a database solely containing magnitudes has been proved to be a difficult task, since the physical composition of both types of objects are similar but with different amount (Harvey et al. 2006). Hsieh & Lai (2013) found that YSOs can stand out from Galaxies in Multi-dimensional Magnitude Space, and thus can be separated straightforwardly. Unfortunately, the computer memory required by the Multi-dimensional Magnitude Space method is too much for a database with 8 photometric bands, so Hsieh & Lai (2013) used two 5-dimensional arrays instead. Here we provide two new methods to distinguish galaxies and YSOs. The first method is based on Hsieh ^ Lai (2013) but use 6-dimensional array instead. The second method is to find the boundary to separate galaxies and YSOs in 6-dimensional magnitude space. We will test whether the method in Hsieh & Lai (2013) is adequate or new method can provide more confidence in distinguishing galaxies and YSOs.