dc.date.accessioned | 2023-08-11T10:38:27Z | |
dc.date.available | 2023-08-11T10:38:27Z | |
dc.date.created | 2023-03-30T15:00:18Z | |
dc.date.issued | 2023 | |
dc.identifier.citation | Parto, Tahere Dehghani, Shahrzad Javadi, Atefeh Saremi, Elham van Loon, Jacco Th. Khosroshahi, Habib G. McDonald, Iain Mirtorabi, Mohammad T. Navabi, Mahdieh Saberi, Maryam . The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. V. The Star Formation History of Sagittarius Dwarf Irregular Galaxy Derived from Long-period Variable Stars. The Astrophysical Journal (ApJ). 2023, 942(1) | |
dc.identifier.uri | http://hdl.handle.net/10852/103166 | |
dc.description.abstract | We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during the period of 2016 June–2017 October, using the 2.5 m Isaac Newton Telescopeat La Palama. Our goal was to identify long-period variable stars (LPVs), namely, asymptotic giant branch stars (AGBs) and red supergiant stars, to obtain the star formation history of isolated, metal-poor SagDIG. For our purpose, we used a method that relies on evaluating the relation between luminosity and the birth mass of these most evolved stars. We found 27 LPV candidates within 2 half-light radii of SagDIG. 10 LPV candidates were in common with previous studies, including one extreme-AGB (x-AGB). By adopting the metallicity Z = 0.0002 for older populations and Z = 0.0004 for younger ages, we estimated that the star formation rate changes from 0.0005 ± 0.0002 M⊙ yr−1 kpc−2 (13 Gyr ago) to 0.0021 ± 0.0010 M⊙ yr−1 kpc−2 (0.06 Gyr ago). Like many dwarf irregular galaxies, SagDIG has had continuous star formation activity across its lifetime, though with different rates, and experiences an enhancement of star formation since z ≃ 1. We also evaluated the total stellar mass within 2 half-light radii of SagDIG for three choices of metallicities. For metallicity Z = 0.0002 and 0.0004, we estimated the stellar mass M* = (5.4 ± 2.3) × 106 and (3.0 ± 1.3) × 106 M⊙, respectively. Additionally, we determined a distance modulus of μ = 25.27 ± 0.05 mag, using the tip of the red giant branch. | |
dc.language | EN | |
dc.rights | Attribution 4.0 International | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.title | The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. V. The Star Formation History of Sagittarius Dwarf Irregular Galaxy Derived from Long-period Variable Stars | |
dc.title.alternative | ENEngelskEnglishThe Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. V. The Star Formation History of Sagittarius Dwarf Irregular Galaxy Derived from Long-period Variable Stars | |
dc.type | Journal article | |
dc.creator.author | Parto, Tahere | |
dc.creator.author | Dehghani, Shahrzad | |
dc.creator.author | Javadi, Atefeh | |
dc.creator.author | Saremi, Elham | |
dc.creator.author | van Loon, Jacco Th. | |
dc.creator.author | Khosroshahi, Habib G. | |
dc.creator.author | McDonald, Iain | |
dc.creator.author | Mirtorabi, Mohammad T. | |
dc.creator.author | Navabi, Mahdieh | |
dc.creator.author | Saberi, Maryam | |
cristin.unitcode | 185,15,3,40 | |
cristin.unitname | Rosseland senter for solfysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |
dc.identifier.cristin | 2138593 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The Astrophysical Journal (ApJ)&rft.volume=942&rft.spage=&rft.date=2023 | |
dc.identifier.jtitle | The Astrophysical Journal (ApJ) | |
dc.identifier.volume | 942 | |
dc.identifier.issue | 1 | |
dc.identifier.pagecount | 13 | |
dc.identifier.doi | https://doi.org/10.3847/1538-4357/aca471 | |
dc.subject.nvi | VDP::Astrofysikk, astronomi: 438 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0004-637X | |
dc.type.version | PublishedVersion | |
cristin.articleid | 33 | |
dc.relation.project | NFR/262622 | |