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Herschel photometric observations of little things dwarf galaxies

Cigan, Phil, Young, Lisa M., Gomez, Haley L. ORCID:, Madden, Suzanne C., De Vis, Pieter, Hunter, Deidre A., Elmegreen, Bruce G. and Brinks, Elias 2021. Herschel photometric observations of little things dwarf galaxies. Astronomical Journal 162 (3) , 83. 10.3847/1538-3881/abfd2e

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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 LTIR and Mdust 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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: IOP Publishing
ISSN: 0004-6256
Funders: ERC
Date of First Compliant Deposit: 15 May 2023
Date of Acceptance: 28 April 2021
Last Modified: 20 May 2023 11:22

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