Search of Extended Objects in the Southern Sky (SExOSS) using S-PLUS DR1: photometric characterization of extragalactic sources

ANDRUCHOW, I.; SAPONARA, J.; HAACK, R.; REYNALDI, V.; LOPEZ, I. ; SMITH CASTELLI, A.

Virtual

Congreso; 62 Reunión Anual de la AAA; 2020

The SExOSS (Search of Extended Objects in the Southern Sky) project is planning to study a large sample of extended sources in the southern sky. Using the S-PLUS data taken in 12 filters (5 broad + 7 narrow bands), the first step will consist in analyzing the photometric relationships shown using the broandband magnitudes, and through a deeper characterization made from narrow band filters behaviour. Such characterization could reveal the existence of new photometric relationships involving one or more of those narrow band magnitudes available in this survey. In the present work, the first results obtained will be shown, on a sample of extended sources included in the first data release (DR1) of S-PLUS. This first release corresponds to the Stripe-82 sky area previously observed by the SDSS. For our analysis, we considered a subsample of objects that had spectra in the SDSS to be able to perform a spectroscopic classification of their internal activity (galaxies with/without star formation, active nuclei, etc.) and then searching for links between the properties shown in the narrow band photometry. The S-PLUS DR1 has more than 3 x105 sources, of which about 3 x104 have been found to be extended and matched in the SDSS. We present here the results obtained on a subsample selected taking a S/N values cut for the SDSS spectra, on which a blind classification of internal activity was carried out.