An all-sky support vector machine selection of WISE YSO candidates

作者：Marton G^*; Toth L V; Paladini R; Kun M; Zahorecz S; McGehee P; Kiss Cs

来源：Monthly Notices of the Royal Astronomical Society, 2016, 458(4): 3479-3488.

DOI：10.1093/mnras/stw398

• methods: data analysis
• methods: statistical
• stars: pre-main-sequence
• stars: protostars
• infrared: general
• infrared: stars

We explored the All WISE catalogue of the Wide-field Infrared Survey Explorer (WISE) mission and identified Young Stellar Object (YSO) candidates. Reliable 2 MASS and WISE photometric data combined with Planck dust opacity values were used to build our data set and to find the best classification scheme. A sophisticated statistical method, the support vector machine (SVM) is used to analyse the multidimensional data space and to remove source types identified as contaminants (extragalactic sources, main-sequence stars, evolved stars and sources related to the interstellar medium). Objects listed in the SIMBAD data base are used to identify the already known sources and to train our method. A new all-sky selection of 133 980 Class I/II YSO candidates is presented. The estimated contamination was found to be well below 1 per cent based on comparison with our SIMBAD training set. We also compare our results to that of existing methods and catalogues. The SVM selection process successfully identified >90 per cent of the Class I/II YSOs based on comparison with photometric and spectroscopic YSO catalogues. Our conclusion is that by using the SVM, our classification is able to identify more known YSOs of the training sample than other methods based on colour-colour and magnitude-colour selection. The distribution of the YSO candidates well correlates with that of the Planck Galactic Cold Clumps in the Taurus-Auriga-Perseus-California region.

• 出版日期2016-6-1