Data Release 2 of S-PLUS: accurate template-fitting based photometry covering $\sim$1000 square degrees in 12 optical filters

• Main Authors: Almeida-Fernandes, F, Sampedro, L, Herpich, F. R, Molino, A, Barbosa, C. E, Buzzo, M. L, Overzier, R. A, de Lima, E. V. R, Nakazono, L. M. I, Schwarz, G. B. Oliveira, Perottoni, H. D, Bolutavicius, G. F, Gutiérrez-Soto, L. A, Santos-Silva, T, Vitorelli, A. Z, Werle, A, Whitten, D. D, Duarte, M. V. Costa, Bom, C. R, Coelho, P, SodréJr, L, Placco, V. M, Teixeira, G. S. M, Alonso-García, J, Beers, T. C, Kanaan, A, Ribeiro, T, Schoenell, W, de Oliveira, C. Mendes
• Format: Journal Article
• Language: English
• Published: 31-03-2021
• Subjects: Physics - Astrophysics of Galaxies; Physics - Instrumentation and Methods for Astrophysics; Physics - Solar and Stellar Astrophysics
• DOI: 10.48550/arxiv.2104.00020

The Southern Photometric Local Universe Survey (S-PLUS) is an ongoing survey
of $\sim$9300 deg$^2$ in the southern sky in a 12-band photometric system. This
paper presents the second data release (DR2) of S-PLUS, consisting of 514 tiles
covering an area of 950 deg$^2$. The data has been fully calibrated using a new
photometric calibration technique suitable for the new generation of wide-field
multi-filter surveys. This technique consists of a $\chi^2$ minimisation to fit
synthetic stellar templates to already calibrated data from other surveys,
eliminating the need for standard stars and reducing the survey duration by
$\sim$15\%. We compare the template-predicted and S-PLUS instrumental
magnitudes to derive the photometric zero-points (ZPs). We show that these ZPs
can be further refined by fitting the stellar templates to the 12 S-PLUS
magnitudes, which better constrain the models by adding the narrow-band
information. We use the STRIPE82 region to estimate ZP errors, which are
$\lesssim10$ mmags for filters J0410, J0430, $g$, J0515, $r$, J0660, $i$, J0861
and $z$; $\lesssim 15$ mmags for filter J0378; and $\lesssim 25$ mmags for
filters $u$ and J0395. We describe the complete data flow of the S-PLUS/DR2
from observations to the final catalogues and present a brief characterisation
of the data. We show that, for a minimum signal-to-noise threshold of 3, the
photometric depths of the DR2 range from 19.9 mag to 21.3 mag (measured in
Petrosian apertures), depending on the filter. The S-PLUS DR2 can be accessed
from the website: https://splus.cloud}{https://splus.cloud.