FAST Ultra-Deep Survey (FUDS): the star formation histories of FUDS0 galaxies
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866929761872248832 |
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| author | Xi, Hongwei Staveley-Smith, Lister Peng, Bo For, Bi-Qing Liu, Bin Ding, Dejian |
| author_facet | Xi, Hongwei Staveley-Smith, Lister Peng, Bo For, Bi-Qing Liu, Bin Ding, Dejian |
| contents | We present the ultraviolet, optical and infrared counterparts of 128 galaxies detected in neutral hydrogen (HI) in the FAST Ultra-Deep Survey (FUDS) field 0 (FUDS0). HI mass upper limits are also calculated for 134 non-detections in the field. Stellar masses ($M_*$), star formation rates (SFRs) and star formation histories are computed by fitting spectral energy distributions (SEDs) using ProSpect. The results show that HI-selected galaxies prefer recent long-lasting, but mild star formation activity, while HI non-detections have earlier and more intense star formation activity. Based on their distribution on the SFR versus $M_*$ diagram, the typical evolution of HI-selected galaxies follows three distinct stages: (i) Early stage: the total SFR increases, though the specific SFR (sSFR) decreases from 10$^{-8}$ to 10$^{-9}$ yr$^{-1}$; (ii) Mass accumulation stage: the SFR is steady, and stellar mass increase linearly with time; (iii) Quenching stage: star formation activity quenches on a rapid timescale and at constant stellar mass. 37 non-detections are located on star-forming main sequence, but are not detected in HI due to low sensitivity close to field edges or close to strong radio frequency interference. Comparisons with the existing optical, optically-selected HI, and HI catalogs show a good agreement with respect to measured $M_*$ and SFR, with minor discrepancies due to selection effects. The ongoing full FUDS survey will help us better explore the evolutionary stages of HI galaxies through a larger sample. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_12857 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | FAST Ultra-Deep Survey (FUDS): the star formation histories of FUDS0 galaxies Xi, Hongwei Staveley-Smith, Lister Peng, Bo For, Bi-Qing Liu, Bin Ding, Dejian Astrophysics of Galaxies We present the ultraviolet, optical and infrared counterparts of 128 galaxies detected in neutral hydrogen (HI) in the FAST Ultra-Deep Survey (FUDS) field 0 (FUDS0). HI mass upper limits are also calculated for 134 non-detections in the field. Stellar masses ($M_*$), star formation rates (SFRs) and star formation histories are computed by fitting spectral energy distributions (SEDs) using ProSpect. The results show that HI-selected galaxies prefer recent long-lasting, but mild star formation activity, while HI non-detections have earlier and more intense star formation activity. Based on their distribution on the SFR versus $M_*$ diagram, the typical evolution of HI-selected galaxies follows three distinct stages: (i) Early stage: the total SFR increases, though the specific SFR (sSFR) decreases from 10$^{-8}$ to 10$^{-9}$ yr$^{-1}$; (ii) Mass accumulation stage: the SFR is steady, and stellar mass increase linearly with time; (iii) Quenching stage: star formation activity quenches on a rapid timescale and at constant stellar mass. 37 non-detections are located on star-forming main sequence, but are not detected in HI due to low sensitivity close to field edges or close to strong radio frequency interference. Comparisons with the existing optical, optically-selected HI, and HI catalogs show a good agreement with respect to measured $M_*$ and SFR, with minor discrepancies due to selection effects. The ongoing full FUDS survey will help us better explore the evolutionary stages of HI galaxies through a larger sample. |
| title | FAST Ultra-Deep Survey (FUDS): the star formation histories of FUDS0 galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.12857 |