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Deepest far ultraviolet view of a central field in the Coma cluster by AstroSat UVIT

Published online by Cambridge University Press:  18 October 2022

Smriti Mahajan Open the ORCID record for Smriti Mahajan [Opens in a new window] ,
Kulinder Pal Singh ,
Joseph E. Postma ,
Kala G. Pradeep ,
Koshy George  and
Patrick Côté
Smriti Mahajan*
Affiliation:
Department of Physical Sciences, Indian Institute for Science Education and Research Mohali- IISERM, Knowledge City, Manauli, 140306 Punjab, India
Kulinder Pal Singh
Affiliation:
Department of Physical Sciences, Indian Institute for Science Education and Research Mohali- IISERM, Knowledge City, Manauli, 140306 Punjab, India
Joseph E. Postma
Affiliation:
Department of Physics and Astronomy, University of Calgary, 2500 University Dr NW, Calgary, Alberta, T2N 1N4, Canada
Kala G. Pradeep
Affiliation:
Department of Physical Sciences, Indian Institute for Science Education and Research Mohali- IISERM, Knowledge City, Manauli, 140306 Punjab, India
Koshy George
Affiliation:
Ludwig-Maximilians-Universität, Scheinerstr. 1, 81679 Munich, Germany
Patrick Côté
Affiliation:
Herzberg Astronomy and Astrophysics Research Centre, National Research Council of Canada, 5071 W. Saanich Road, Victoria, BC V9E 2E7, Canada
*
Corresponding author: Smriti Mahajan, Email: smritimahajan@iisermohali.ac.in
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Abstract

We present analysis of the far ultraviolet (FUV) emission of sources in the central region of the Coma cluster ( $z=0.023$ ) using the data taken by the UVIT aboard the multi-wavelength satellite mission AstroSat. We find a good correlation between the UVIT FUV flux and the fluxes in both wavebands of the Galex mission, for the common sources. We detect stars and galaxies, amongst which the brightest ( $r \lesssim 17$ mag) galaxies in the field of view are mostly members of the Coma cluster. We also detect three quasars ( $z = 0.38, 0.51, 2.31$ ), one of which is likely the farthest object observed by the UVIT so far. In almost all the optical and UV colour-colour and colour-magnitude planes explored in this work, the Coma galaxies, other galaxies and bright stars could be separately identified, but the fainter stars and quasars often coincide with the faint galaxies. We have also investigated galaxies with unusual FUV morphology which are likely to be galaxies experiencing ram-pressure stripping in the cluster. Amongst others, two confirmed cluster members which were not investigated in the literature earlier, have been found to show unusual FUV emission. All the distorted sources are likely to have fallen into the cluster recently, and hence have not virialised yet. A subset of our data have optical spectroscopic information available from the archives. For these sources ( ${\sim} 10\%$ of the sample), we find that 17 galaxies identify as star-forming, 18 as composite and 13 as host galaxies for active galactic nuclei, respectively on the emission-line diagnostic diagram.

Keywords

galaxies: evolutiongalaxies: fundamental parametersgalaxies: star formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 39 , 2022 , e048
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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