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FAST H i 21 cm Study of Blueberry Galaxies
The Astrophysical Journal Letters ( IF 8.8 ) 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

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.

中文翻译:


FAST H i 21 cm 蓝莓星系研究



绿豌豆 (GPs) 和蓝莓星系 (BBs) 被认为是高红移 Lyα 辐射体的局地类似物 (z < 0.1)。H i 研究这些可以帮助我们了解原始宇宙中的恒星形成。在这封信中,我们介绍了 H i 21 cm 研究的结果,该研究使用 500 米口径球面射电望远镜在 z ≲ 0.05 处对 28 个高比恒星形成速率 (sSFR ≳ 10-8yr −1) BBs 的研究结果。我们报告了对两个 BB 的显着 H i 探测,即 J1026+0426 和 J1132+0809,并讨论了邻近星系可能的 H i 贡献。对于未探测到的星系,H i 质量的中位数 3σ 上限 ∼2.0 × 108M⊙ 获得。我们发现,对于主序星系,BB 的 H i 与恒星质量比或气体分数 (fH i) 往往低于 fH i-sSFR 和 fH i-M* 关系的预期。BB 在 H i 气体消耗时间尺度 (τH i) ∼ 0.5 Gyr 上也有一个中位数 3σ 上限,比本地主序星系的 τH i 低约 1 个数量级。我们发现对这些星系的 H i 检出率非常低,为 2/28 (7.1 %),这与之前对高电离参数指标 O32 ≡ O[iii]λ5007/O[ii]λ3727 比率 ≳10 的低红移 GP 的 H i 研究相似。
更新日期:2024-12-03
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