The AKARI FIS YSO Catalogue

TL;DR

This paper utilizes AKARI and WISE infrared data to identify and catalog young stellar objects in our galaxy, achieving high classification reliability and revealing their distribution relative to galactic structures.

Contribution

The study introduces a new AKARI FIS YSO catalogue with over 44,000 candidates, employing Quadratic Discriminant Analysis for classification, and highlights a high percentage of previously uncatalogued YSOs.

Findings

Over 90% classification reliability compared to known YSOs

76% of YSO candidates are newly identified sources

YSO distribution correlates with galactic ISM and infrared structures

Abstract

We demonstrate the use of the AKARI survey photometric data in the study of galactic star formation. Our aim was to select young stellar objects (YSOs) in the AKARI FIS catalogue. We used AKARI Far-Infrared Surveyor and Wide-field Infrared Survey Explorer data to derive mid- and far-infrared colours of YSOs. Classification schemes based on Quadratic Discriminant Analysis have been given for YSOs. The training catalogue for QDA was the whole sky selection of previously known YSOs (i.e. listed in SIMBAD). A new catalogue of AKARI FIS YSO candidates including 44001 sources has been prepared. Reliability of the classification is over 90% as tested in comparison to known YSOs. As much as 76% of our YSO candidates are from previously uncatalogued type. The vast majority of these sources are Class I and II types according to the Lada classification. The distribution of AKARI FIS YSOs' is well correlated with that of the galactic ISM. Local over densities were found on infrared loops and towards the cold clumps detected by Planck.