UVIT view of NGC 5291: Ongoing star formation in tidal dwarf galaxies at 0.35 kpc resolution - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2023

UVIT view of NGC 5291: Ongoing star formation in tidal dwarf galaxies at 0.35 kpc resolution

R. Rakhi
  • Function : Author
Geethika Santhosh
  • Function : Author
Prajwel Joseph
  • Function : Author
Koshy George
  • Function : Author
Smitha Subramanian
  • Function : Author
Indulekha Kavila
  • Function : Author
J. Postma
  • Function : Author
Patrick Côté
  • Function : Author
Luca Cortese
  • Function : Author
S. K. Ghosh
  • Function : Author
Annapurni Subramaniam
  • Function : Author
Shyam Tandon
  • Function : Author
John Hutchings
  • Function : Author
P. Samuel Wesley
  • Function : Author
Aditya Bharadwaj
  • Function : Author
Neeran Niroula
  • Function : Author

Abstract

NGC 5291, an early-type galaxy surrounded by a giant H I ring, is believed to be formed from collision with another galaxy. Several star forming complexes and tidal dwarf galaxies are distributed along the collisional ring which are sites of star formation in environments where extreme dynamical effects are involved. Dynamical effects can affect the star formation properties and the spatial distribution of star forming complexes along the tidal features. To study and quantify the star formation activity in the main body and in the ring structure of the NGC 5291 system, we use high spatial resolution FUV and NUV imaging observations from the Ultraviolet Imaging Telescope onboard AstroSat. A total of 57 star-forming knots are identified to be part of this interacting system out of which 12 are new detections (star forming complexes that lie inside the H I contour) compared to the previous measurements from lower resolution UV imaging. We estimate the attenuation in UV for each of the resolved star-forming knots using the UV spectral slope β, derived from the FUV - NUV colour. Using the extinction corrected UV fluxes, we derive the star formation rate of the resolved star forming complexes. The extinction corrected total star formation rate of this system is estimated as 1.75 ± 0.04 M yr-1. The comparison with dwarf galaxy populations (BCD, Sm and dIm galaxies) in the nearby Universe shows that many of the knots in the NGC 5291 system have SFR values comparable to the SFR of BCD galaxies.
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insu-04065896 , version 1 (12-07-2023)

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R. Rakhi, Geethika Santhosh, Prajwel Joseph, Koshy George, Smitha Subramanian, et al.. UVIT view of NGC 5291: Ongoing star formation in tidal dwarf galaxies at 0.35 kpc resolution. Monthly Notices of the Royal Astronomical Society, 2023, ⟨10.1093/mnras/stad970⟩. ⟨insu-04065896⟩
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