发表机构
Instituto de Física y Astronomía, Universidad de Valparaíso; Millennium Nucleus for Galaxies (MINGAL); Institute for Astronomy, University of Edinburgh; Jodrell Bank Centre for Astrophysics, University of Manchester; Institute of Science and Technology Austria (IS（瓦尔帕莱索大学物理与天文学研究所; 银河系千年核; 爱丁堡大学天文研究所; 曼彻斯特大学乔德雷尔银行天体物理学中心; 奥地利科学与理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究利用JWST窄带选择帕申线发射星系，结合多波段数据，发现宇宙正午星系普遍存在短期恒星形成爆发，但被遮蔽的恒星形成和气体质量仅能给出上限。
AI 中文摘要
背景：窄带JWST/NIRCam选择在明确界定的红移切片中分离恒星形成星系，而ALMA和档案远红外/亚毫米数据揭示被遮蔽的成长。我们结合这些来测量帕申线恒星形成率，从EAZY Av推断星云消光，并通过加权中值叠加探测远红外到亚毫米发射，以约束宇宙正午的星系成长。目标：我们表征COSMOS中帕申线选择星系的恒星、星云和远红外性质，在z~1.50（Pa-alpha）和z~2.65（Pa-beta）两个集合中，量化短期与长期恒星形成和尘埃衰减，并约束被遮蔽的恒星形成率和气体质量。方法：我们从JELS F466N/F470N马赛克中选择稳健的窄带过量样本（Pa-alpha：77个，Pa-beta：31个源），通过X射线/射电匹配移除活动星系核，并组装多波段测光数据（JWST、HST、Spitzer、Herschel、SCUBA-2、AzTEC、ALMA）。测光红移/恒星性质来自EAZY/STARDUST；线恒星形成率使用最近的帕申校准，星云消光来自EAZY Av。结果：EAZY拟合显示恒星质量log(Mstar/Msun)~7.4-10.3和适度的恒星形成率（0.1-27 Msun/yr）。线恒星形成率为Pa-alpha/beta的0.1-22.0和0.7-47.9 Msun/yr。大多数源显示短期爆发（线恒星形成率超过SED恒星形成率），随质量弱递减。星云衰减与质量和恒星形成率相关。叠加在MIRI之外没有>3sigma探测。加权中值SED给出SFR_UV,med = 0.48±0.11和3.92±0.47 Msun/yr（Pa-alpha/beta）。ALMA Band 4给出最紧的约束：中值3-sigma上限SFR_IR<53（Pa-alpha）和<44 Msun/yr（Pa-beta）；气体质量<10^11.2（Pa-alpha）和<10^10.6 Msun（Pa-beta）。结论：帕申线选择样本显示广泛的短期恒星形成，但远红外/亚毫米数据仅给出被遮蔽的恒星形成率/星际介质质量的上限。需要更深的光谱和ALMA连续谱数据来约束被遮蔽的恒星形成和气体储库。
英文摘要
Context: Narrowband JWST/NIRCam selection isolates star-forming galaxies in well-defined redshift slices, while ALMA and archival far-IR/submm data reveal obscured growth. We combine these to measure Paschen-line SFRs, infer nebular extinction from EAZY Av, and probe FIR-to-submm emission via weighted-median stacking, to constrain galaxy growth at cosmic noon. Aims: We characterize stellar, nebular, and FIR properties of Paschen-selected galaxies in COSMOS, in two ensembles at z~1.50 (Pa-alpha) and z~2.65 (Pa-beta), quantifying short- vs long-timescale SF and dust attenuation, and constraining obscured SFR and gas masses. Methods: We select robust narrowband-excess samples from the JELS F466N/F470N mosaic (Pa-alpha: 77, Pa-beta: 31 sources), remove AGN via X-ray/radio matching, and assemble multiwavelength photometry (JWST, HST, Spitzer, Herschel, SCUBA-2, AzTEC, ALMA). Photo-z/stellar properties come from EAZY/STARDUST; line SFRs use recent Paschen calibrations, with nebular extinction from EAZY Av. Results: EAZY fits show stellar masses log(Mstar/Msun)~7.4-10.3 and modest SFRs (0.1-27 Msun/yr). Line SFRs are 0.1-22.0 and 0.7-47.9 Msun/yr for Pa-alpha/beta. Most sources show short-term bursts (line SFRs exceed SED SFRs), weakly decreasing with mass. Nebular attenuation correlates with mass and SFR. Stacking gives no >3sigma detections beyond MIRI. The weighted-median SED gives SFR_UV,med = 0.48+-0.11 and 3.92+-0.47 Msun/yr for Pa-alpha/beta. ALMA Band 4 gives the tightest constraints: median 3-sigma limits SFR_IR<53 (Pa-alpha) and <44 Msun/yr (Pa-beta); gas mass <10^11.2 (Pa-alpha) and <10^10.6 Msun (Pa-beta). Conclusions: Paschen-selected samples show widespread short-timescale star formation, but FIR/sub-mm data give only upper limits on obscured SFR/ISM mass. Deeper spectroscopy and ALMA continuum data are needed to constrain obscured SF and gas reservoirs.
Comments18 pages, 7 figures, 5 tables, the main text is 13 pages, appendix is 5 pages, accepted for publication in A&A
