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Stellar Population near NGC 2021: Procession of Star Formation in the South Rim of Supergiant Shell LMC 4

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Title: Stellar Population near NGC 2021: Procession of Star Formation in the South Rim of Supergiant Shell LMC 4
Authors: Po-Sheng Ou, Rui-Ching Chao, You-Hua Chu, Chin-Yi Hsu, Chuan-Jui Li
Source: The Astronomical Journal, Vol 168, Iss 1, p 33 (2024)
Publisher Information: IOP Publishing, 2024.
Publication Year: 2024
Collection: LCC:Astronomy
Subject Terms: Large Magellanic Cloud, Magellanic Clouds, Star formation, Stellar populations, Astronomy, QB1-991
More Details: Supergiant shells (SGSs) are the largest interstellar structures where heated and enriched gas flows into the host galaxy’s halo. The SGSs in the Large Magellanic Cloud (LMC) are so close that their stars can be resolved with ground-based telescopes to allow studies of star-formation history. Aiming to study the star formation history and energy budget of LMC 4, we have conducted a pilot study of the cluster NGC 2021 and the OB associations in its vicinity near the south rim of LMC 4. We use the Magellanic Cloud Photometric Survey data of the LMC to establish a methodology to examine the stellar population and assess the massive star formation history. We find a radial procession of massive star formation from the northwest part of the OB association LH79 through NGC 2021 to the OB association LH78 in the south. Using the stellar content of NGC 2021 and the assumption of Salpeter’s initial mass function, we estimate that ∼4 supernovae have occurred in NGC 2021, injecting at least 4 × 10 ^51 erg of kinetic energy into the interior of LMC 4.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1538-3881
Relation: https://doaj.org/toc/1538-3881
DOI: 10.3847/1538-3881/ad47b9
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Accession Number: edsdoj.72faec675c41339a8b437c2a0cfa4c
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  Data: Stellar Population near NGC 2021: Procession of Star Formation in the South Rim of Supergiant Shell LMC 4
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  Data: <searchLink fieldCode="AR" term="%22Po-Sheng+Ou%22">Po-Sheng Ou</searchLink><br /><searchLink fieldCode="AR" term="%22Rui-Ching+Chao%22">Rui-Ching Chao</searchLink><br /><searchLink fieldCode="AR" term="%22You-Hua+Chu%22">You-Hua Chu</searchLink><br /><searchLink fieldCode="AR" term="%22Chin-Yi+Hsu%22">Chin-Yi Hsu</searchLink><br /><searchLink fieldCode="AR" term="%22Chuan-Jui+Li%22">Chuan-Jui Li</searchLink>
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  Data: The Astronomical Journal, Vol 168, Iss 1, p 33 (2024)
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  Data: IOP Publishing, 2024.
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  Data: <searchLink fieldCode="DE" term="%22Large+Magellanic+Cloud%22">Large Magellanic Cloud</searchLink><br /><searchLink fieldCode="DE" term="%22Magellanic+Clouds%22">Magellanic Clouds</searchLink><br /><searchLink fieldCode="DE" term="%22Star+formation%22">Star formation</searchLink><br /><searchLink fieldCode="DE" term="%22Stellar+populations%22">Stellar populations</searchLink><br /><searchLink fieldCode="DE" term="%22Astronomy%22">Astronomy</searchLink><br /><searchLink fieldCode="DE" term="%22QB1-991%22">QB1-991</searchLink>
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  Data: Supergiant shells (SGSs) are the largest interstellar structures where heated and enriched gas flows into the host galaxy’s halo. The SGSs in the Large Magellanic Cloud (LMC) are so close that their stars can be resolved with ground-based telescopes to allow studies of star-formation history. Aiming to study the star formation history and energy budget of LMC 4, we have conducted a pilot study of the cluster NGC 2021 and the OB associations in its vicinity near the south rim of LMC 4. We use the Magellanic Cloud Photometric Survey data of the LMC to establish a methodology to examine the stellar population and assess the massive star formation history. We find a radial procession of massive star formation from the northwest part of the OB association LH79 through NGC 2021 to the OB association LH78 in the south. Using the stellar content of NGC 2021 and the assumption of Salpeter’s initial mass function, we estimate that ∼4 supernovae have occurred in NGC 2021, injecting at least 4 × 10 ^51 erg of kinetic energy into the interior of LMC 4.
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      – SubjectFull: Large Magellanic Cloud
        Type: general
      – SubjectFull: Magellanic Clouds
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      – SubjectFull: Star formation
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