FAST H i 21 cm Study of Blueberry Galaxies

The Astrophysical Journal Letters Pub Date : 2024-12-02 DOI:10.3847/2041-8213/ad901c

Yogesh Chandola, Chao-Wei Tsai, D. J. Saikia, Guodong Li, Di Li and Yin-Zhe Ma

{"title":"FAST H i 21 cm Study of Blueberry Galaxies","authors":"Yogesh Chandola, Chao-Wei Tsai, D. J. Saikia, Guodong Li, Di Li and Yin-Zhe Ma","doi":"10.3847/2041-8213/ad901c","DOIUrl":null,"url":null,"abstract":"Green Peas (GPs) and blueberry galaxies (BBs) are thought to be local analogs (z < 0.1) of high redshift Lyα emitters. H i study of these can help us understand the star formation in the primordial Universe. In this Letter, we present the results of H i 21 cm study of 28 high specific star formation rate (sSFR ≳ 10−8yr −1) BBs at z ≲ 0.05 with the Five-hundred-meter Aperture Spherical radio Telescope. We report significant H i detection towards two BBs, namely J1026+0426 and J1132+0809, and discuss possible H i contribution from neighboring galaxies. The median 3σ upper limit of ∼2.0 × 108M⊙ was obtained on H i mass for galaxies with nondetections. We find BBs tend to have lower H i-to-stellar-mass ratio or gas fraction (fH i) than expected from fH i–sSFR and fH i–M* relations for main-sequence galaxies. The BBs also have a median 3σ upper limit on H i gas depletion timescale (τH i) ∼ 0.5 Gyr, about 1 order of magnitude lower than τH i for local main-sequence galaxies. We find a significantly low H i detection rate of 2/28 (7.1 %) towards these galaxies, which is similar to previous H i studies of low redshift GPs of high ionization parameter indicator, O32 ≡ O[iii]λ5007/O[ii]λ3727 ratios ≳10.","PeriodicalId":501814,"journal":{"name":"The Astrophysical Journal Letters","volume":"37 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Astrophysical Journal Letters","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3847/2041-8213/ad901c","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

Green Peas (GPs) and blueberry galaxies (BBs) are thought to be local analogs (z < 0.1) of high redshift Lyα emitters. H i study of these can help us understand the star formation in the primordial Universe. In this Letter, we present the results of H i 21 cm study of 28 high specific star formation rate (sSFR ≳ 10−8yr −1) BBs at z ≲ 0.05 with the Five-hundred-meter Aperture Spherical radio Telescope. We report significant H i detection towards two BBs, namely J1026+0426 and J1132+0809, and discuss possible H i contribution from neighboring galaxies. The median 3σ upper limit of ∼2.0 × 108M⊙ was obtained on H i mass for galaxies with nondetections. We find BBs tend to have lower H i-to-stellar-mass ratio or gas fraction (fH i) than expected from fH i–sSFR and fH i–M* relations for main-sequence galaxies. The BBs also have a median 3σ upper limit on H i gas depletion timescale (τH i) ∼ 0.5 Gyr, about 1 order of magnitude lower than τH i for local main-sequence galaxies. We find a significantly low H i detection rate of 2/28 (7.1 %) towards these galaxies, which is similar to previous H i studies of low redshift GPs of high ionization parameter indicator, O32 ≡ O[iii]λ5007/O[ii]λ3727 ratios ≳10.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

The Astrophysical Journal Letters

自引率

0.00%

发文量