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 (\(\sim \)1 arcsec) and new astrometry calibration (\(\sim \)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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Notes
Tests showed that separations of 9 pixels (3.75\(^{\prime \prime }\)) was enough to obtain good flux measurements for adjacent UVIT sources, and this same separation was more than enough to avoid confusion with nearby PHAT sources.
The errors increase rapidly for magnitudes fainter than 22. For example, at magnitude 23, which is roughly the detection limit, typical errors are >0.45 magnitudes.
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Acknowledgements
This project is undertaken with the financial support of the Canadian Space Agency and of the Natural Sciences and Engineering Research Council of Canada. This publication uses data from the AstroSat mission of the Indian Space Research Institute (ISRO), archived at the Indian Space Science Data Center (ISSDC). This publication uses UVIT data processed by the payload operations centre at IIA. The UVIT is built in collaboration between IIA, IUCAA, TIFR, ISRO and CSA.
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This article is part of the Special Issue on “AstroSat: Five Years in Orbit”.
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Leahy, D.A., Postma, J., Buick, M. et al. New results from the UVIT survey of the Andromeda galaxy. J Astrophys Astron 42, 84 (2021). https://doi.org/10.1007/s12036-020-09682-3
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DOI: https://doi.org/10.1007/s12036-020-09682-3