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Recovering the origin of star formation in the central region of I Zw 81

Published online by Cambridge University Press:  09 June 2023

Divya Pandey Open the ORCID record for Divya Pandey [Opens in a new window] ,
Kanak Saha  and
Ananta C. Pradhan
Divya Pandey
Affiliation:
Department of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha 769008, India
Kanak Saha
Affiliation:
Inter-University Centre for Astronomy & Astrophysics, Postbag 4, Ganeshkhind, Pune 411007, India
Ananta C. Pradhan
Affiliation:
Department of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha 769008, India
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Abstract

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We have studied the star formation properties of a massive void galaxy - I Zw 81. We performed 2D structural decomposition on Canada France Hawaii Telescope (CFHT) g- and r-band observation of I Zw 81 using GALFIT. The galaxy consists of an unresolved small bulge, a bar, an inner ring, and a truncated disk. We have used far-ultraviolet (FUV) and near-UV (NUV) observation of Ultraviolet Imaging Telescope (UVIT) onboard AstroSat for our analysis. The NUV–r color map of the lenticular galaxy illustrates a shallow positive color gradient in the profile, implying that the bar and inner ring are more star-forming than the outer disk. The FUV emission is mainly concentrated in the central region of the galaxy. A tidal tail-like feature is detected in the CFHT observations. We infer that bar and minor mergers-like interactions enhance the gas inflow and drive star formation in the center of I Zw 81.

Keywords

galaxies: elliptical and lenticularultraviolet: galaxiesgalaxies: interactions
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies , August 2021 , pp. 210 - 212
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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