The GALANTE photometric survey of the northern Galactic plane: Project description and pipeline

TL;DR

The GALANTE survey maps the northern Galactic plane using seven filters to identify and analyze various stellar populations with high photometric accuracy, employing a novel calibration system based on Gaia and 2MASS data.

Contribution

This paper introduces the GALANTE survey's observational strategy, data processing pipeline, and innovative calibration method leveraging Gaia DR2 and 2MASS photometry.

Findings

Achieved 1% photometric accuracy for stars brighter than magnitude 17.

Successfully developed a pipeline for processing multi-filter photometric data.

Established a calibration system based on Gaia DR2 and 2MASS for high-precision photometry.

Abstract

The GALANTE optical photometric survey is observing the northern Galactic plane and some adjacent regions using seven narrow- and intermediate-filters, covering a total of 1618 square degrees. The survey has been designed with multiple exposure times and at least two different air masses per field to maximize its photometric dynamic range, comparable to that of Gaia, and ensure the accuracy of its photometric calibration. The goal is to reach at least 1% accuracy and precision in the seven bands for all stars brighter than AB magnitude 17 while detecting fainter stars with lower values of the signal-to-noise ratio.The main purposes of GALANTE are the identification and study of extinguished O+B+WR stars, the derivation of their extinction characteristics, and the cataloguing of F and G stars in the solar neighbourhood. Its data will be also used for a variety of other stellar studies and to generate a high-resolution continuum-free map of the H{\alpha} emission in the Galactic plane. We describe the techniques and the pipeline that are being used to process the data, including the basis of an innovative calibration system based on Gaia DR2 and 2MASS photometry.