AstroSat UVIT Survey of M31: Point-source Catalog

An ultraviolet survey of M31 has been carried out during 2017-19 with the UltraViolet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we analyze far- and near-ultraviolet (FUV and NUV) observations from the M31 UVIT survey, which covers a sky area of ≃3° × 1° with spatial resolution of ≃1″. The observations included six filter bands in the wavelength range of 120–280 nm. The limiting magnitude (AB) in the FUV band (CaF2 filter), which has the largest number of detected sources, is ∼23. The primary product of this work is the M31 UVIT point-source catalog containing positions and photometry. In total ≃75,000 sources were detected at FUV or NUV wavelengths.