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    • Volume 42 All articles Published: 4 June 2021 Article ID 0031 SCIENCE RESULTS

      Dorado and its member galaxies II: A UVIT picture of the NGC 1533 substructure

      R. RAMPAZZO P. MAZZEI A. MARINO L. BIANCHI S. CIROI E. V. HELD E. IODICE J. POSTMA E. RYAN-WEBER M. SPAVONE M. USLENGHI

      More Details Abstract Fulltext PDF

      Dorado is a nearby (17.69 Mpc) strongly evolving galaxy group in the Southern Hemisphere. We are investigating the star formation in this group. This paper provides a FUV imaging of NGC 1533, IC 2038 and IC 2039, which form a substructure, south west of the Dorado group barycentre. FUV CaF2-1UVIT-Astrosat images enrich our knowledge of the system provided by GALEX. In conjunction with deep optical wide-field, narrow-band Ha and 21-cm radio images we search for signatures of the interaction mechanisms looking in the FUV morphologies and derive the star formation rate. The shape of the FUVluminosity profile suggests the presence of a disk in all three galaxies. FUV emission is detected out to the optical size for IC 2038, and in compact structures corresponding to Ha and H ii bright features in NGC 1533. A faint FUV emission, without an optical counterpart, reminiscent of the H i structure that surrounds the outskirts of NGC 1533 and extends up to IC 2038/2039, is revealed above the local background noise.

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