University of Hertfordshire

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By the same authors

Herschel Photometric Observations of LITTLE THINGS Dwarf Galaxies

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  • Phil Cigan
  • Lisa M. Young
  • Haley L. Gomez
  • Suzanne C. Madden
  • Pieter De Vis
  • Deidre A. Hunter
  • Bruce G. Elmegreen
  • Elias Brinks
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Original languageEnglish
Article number83
Number of pages22
JournalThe Astronomical Journal
Publication statusPublished - 2 Aug 2021


We present here far-infrared photometry of galaxies in a sample that is relatively unexplored at these wavelengths: low-metallicity dwarf galaxies with moderate star formation rates. Four dwarf irregular galaxies from the Little Things survey are considered, with deep Herschel PACS and SPIRE observations at 100, 160, 250, 350, and 500 μm. Results from modified blackbody fits indicate that these galaxies have low dust masses and cooler dust temperatures than more actively star-forming dwarfs, occupying the lowest L TIR and M dust regimes seen among these samples. Dust-to-gas mass ratios of ∼10-5 are lower, overall, than in more massive and active galaxies but are roughly consistent with the broken power-law relation between the dust-to-gas ratio and metallicity found for other low-metallicity systems. Chemical evolution modeling suggests that these dwarf galaxies are likely forming very little dust via stars or grain growth and have very high dust destruction rates.


© 2021. The American Astronomical Society. All rights reserved. This is the accepted manuscript version of an article which has been published in final form at

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