New Results from the UVIT Survey of the Andromeda Galaxy
D.A. Leahy, J. Postma, M. Buick, C. Morgan, L. Bianchi, and J., Hutchings
TL;DR
This paper presents new UV imaging data of the Andromeda Galaxy from UVIT, with improved calibration and astrometry, enabling detailed source identification and matching with Hubble data.
Contribution
It introduces a new calibration and data processing method for UVIT data, enhancing astrometry and photometry for better source identification in M31.
Findings
High-resolution UV images of M31 were obtained.
Improved astrometry allows precise source matching.
New insights into UV-bright sources in M31.
Abstract
The Andromeda Galaxy (M31) has been observed with the UltraViolet Imaging Telescope (UVIT) instrument onboard the AstroSat Observatory. The M31 sky area was covered with 19 fields, in multiple UV filters per field, over the period of 2017 to 2019. The entire galaxy was observed in the FUV F148W filter, and more than half observed in the NUV filters. A new calibration and data processing is described which improves the astrometry and photometry of the UVIT data. The high spatial resolution of UVIT (1 arcsec) and new astrometry calibration (0.2 arcsec) allow identification of UVIT sources with stars, star clusters, X-ray sources, and other source types within M31 to a much better level than previously possible. We present new results from matching UVIT sources with stars measured as part of the Pan-chromatic Hubble Andromeda Treasury project in M31.
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