• L. BIANCHI

      Articles written in Journal of Astrophysics and Astronomy

    • 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

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      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.

    • New results from the UVIT survey of the Andromeda galaxy

      D. A. LEAHY J. POSTMA M. BUICK C. MORGAN L. BIANCHI J. HUTCHINGS

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      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 isdescribed 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 Panchromatic Hubble Andromeda Treasury project in M31.

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