UVIT observations of the Small Magellanic Cloud: Point source catalogue

TL;DR

This paper presents a catalog of over 11,000 ultraviolet point sources in the Small Magellanic Cloud, obtained from UVIT observations, providing valuable data for astrophysical research.

Contribution

First UVIT-based point source catalog of the Small Magellanic Cloud with detailed photometry across multiple UV filters and an expression to estimate total count rates including saturation effects.

Findings

Catalog of 11,241 sources in FUV and NUV bands

High spatial resolution better than 1.5 arcseconds

Online availability of the catalog for community use

Abstract

Three fields in the outskirts of the Small Magellanic Cloud were observed by the Ultra-Violet Imaging Telescope (UVIT) on board AstroSat, during 31 December 2017 and 01 January 2018. The observations were carried out on a total of seven filters, three in the far ultra-violet (FUV; 1300$-$1800 \r{A}) band and four in the near ultra-violet (NUV; 2000$-$3000 \r{A}) band. We carried out photometry of these observations that have a spatial resolution better than 1.5$^{\prime\prime}$. We present here the first results of this work, which is a matched catalogue of 11,241 sources detected in three FUV and four NUV wavelengths. We make the catalogue available online, which would be of use to the astronomical community to address a wide variety of astrophysical problems. We provide an expression to estimate the total count rate in the full point spread function of UVIT that also incorporate the effect of saturation.