The SAMI Galaxy Survey: the discovery of a luminous, low-metallicity H II complex in the dwarf galaxy GAMA J141103.98-003242.3 ...
We present the discovery of a luminous unresolved H ii complex on the edge of dwarf galaxy GAMA J141103.98−003242.3 using data from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. This dwarf galaxy is situated at a distance of ∼100 Mpc and contains an unresolved region...
Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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Format: | Text |
Language: | unknown |
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Swinburne
2024
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Online Access: | https://dx.doi.org/10.25916/sut.26243039.v1 https://swinburne.figshare.com/articles/journal_contribution/The_SAMI_Galaxy_Survey_the_discovery_of_a_luminous_low-metallicity_H_II_complex_in_the_dwarf_galaxy_GAMA_J141103_98-003242_3/26243039/1 |
Summary: | We present the discovery of a luminous unresolved H ii complex on the edge of dwarf galaxy GAMA J141103.98−003242.3 using data from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. This dwarf galaxy is situated at a distance of ∼100 Mpc and contains an unresolved region of H ii emission that contributes ∼70 per cent of the galaxy's Hα luminosity, located at the top end of established H ii region luminosity functions. For the H ii complex, we measure a star formation rate of 0.147 ± 0.041 M⊙ yr−1and a metallicity of 12+log(O/H) = 8.01 ± 0.05 that is lower than the rest of the galaxy by ∼0.2 dex. Data from the H i Parkes All-Sky Survey (HIPASS) indicate the likely presence of neutral hydrogen in the galaxy to potentially fuel ongoing and future star-forming events. We discuss various triggering mechanisms for the intense star formation activity of this H ii complex, where the kinematics of the ionized gas are well described by a rotating disc and do not show any features indicative ... |
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