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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Extended far-ultraviolet emission in distant dwarf galaxies.

Anshuman Borgohain1, Kanak Saha2, Bruce Elmegreen3

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This summary is machine-generated.

We observed extended star formation in blue compact dwarf galaxies using the AstroSat telescope. This suggests ongoing gas accretion and gravitational instability in their outer regions.

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Area of Science:

  • Astronomy and Astrophysics
  • Galaxy Formation and Evolution

Background:

  • Blue compact dwarf (BCD) galaxies are low-luminosity, metal-poor, and centrally concentrated, featuring star formation clumps.
  • Observing BCD formation is challenging due to dimming and small size at high redshifts.
  • Intermediate redshift observations are crucial for studying BCDs' early evolutionary stages, especially outer regions influenced by gas accretion.

Purpose of the Study:

  • To investigate the formation processes of blue compact dwarf galaxies.
  • To analyze star formation activity in the outer regions of BCDs at intermediate redshifts.

Main Methods:

  • Observations of 11 BCDs in the GOODS South field using the Ultra-Violet Imaging Telescope on AstroSat.
  • Analysis of far-ultraviolet (FUV) emission and comparison with optical data from the Hubble Space Telescope.
  • Correction for instrument point spread function to determine intrinsic FUV emission radial profiles.

Main Results:

  • Excess far-ultraviolet (FUV) emission detected in the outer regions of 11 BCDs at redshifts 0.1-0.24.
  • Radial profiles of intrinsic FUV emission show larger scale lengths than optical counterparts for ten BCDs.
  • Clumpy FUV structure indicates gravitational instability in the outer disks.

Conclusions:

  • Extended star formation in cosmically accreting disks is suggested by shallow FUV profiles.
  • Gravitational instability in outer FUV disks drives inward migration of clumps via dynamical friction.
  • BCD outer regions are actively evolving, driven by gas accretion and internal dynamics.