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THE AKARI FIS CATALOGUE OF YSOS AND EXTRAGALACTIC OBJECTS
L. Viktor Toth,GABOR MARTON,SAROLTA ZAHORECZ,LAJOS G. BALAZS,ANDREA NAGY 한국천문학회 2017 天文學論叢 Vol.32 No.1
The point sources in the Bright Source Catalogue of the \textit{AKARI} Far-Infrared Surveyor (FIS) were classified based on their FIR and mid-IR fluxes and colours into young stellar object (YSO) and extragalactic source types using a Quadratic Discriminant Analysis method (QDA) and Support Vector Machines (SVM). The reliability of the selection of YSO candidates is high, and the number of known YSO candidates were increased significantly, that we demonstrate in the case of the nearby open cluster {IC348}. Our results show that we can separate galactic and extragalactic \textit{AKARI} point sources in the multidimensioal space of FIR fluxes and colours with high reliability, however, differentiating among the extragalactic sub-types needs further information.
FOREGROUND OF GAMMA-RAY BURSTS (GRBS) FROM AKARI FIS DATA
L. Viktor Toth,YASUO DOI,SAROLTA ZAHORECZ,Marton Agas,LAJOS G. BALAZS,Adrienn Forro,Istvan I. Racz 한국천문학회 2017 天文學論叢 Vol.32 No.1
A significant number of the parameters of a gamma-ray burst (GRB) and its host galaxy are calculated from the afterglow. There are various methods obtaining extinction values for the necessary correction for galactic foreground. These are: galaxy counts, from HI 21 cm surveys, from spectroscopic measurements and colors of nearby Galactic stars, or using extinction maps calculated from infrared surveys towards the GRB. We demonstrate that \textit{AKARI} Far-Infrared Surveyor sky surface brightness maps are useful uncovering the fine structure of the galactic foreground of GRBs. Galactic cirrus structures of a number of GRBs are calculated with a 2 arcminute resolution, and the results are compared to that of other methods.