天文学进展2023，Vol.41Issue(4)：529-545,17.DOI:10.3969/j.issn.1000-8349.2023.04.05
富尘埃宽发射线类星体的CO发射
CO Emission of Dust-Rich Broad-Emission-Line Quasars
摘要
Abstract
Dust-rich broad-emission-line qusars(DBQs)are in a critical phase in galaxy evolution,whose star-forming potential can be revealed by the molecular gas.We used the IRAM-30m telescope to observe CO emission lines in nine DBQs at 0.5＜z＜3,and detected nine lines at different transitions in eight sources.Five lines are strong detections,and four lines are tentative detections.According to the CO line-width versus line luminosity diagram,seven sources satisfy the unlensed/slightly-lensed relation,while one is likely to be strongly lensed by a factor of about 12.With lensing-corrected infrared luminosities from the literature and SED fitting,we estimate their star formation rates to be approximately 40～3 500 M⊙·a-1,and the gas depletion time to be approximately 20～300 Ma.Their star formation efficiency shows no significant difference from other SMGs and QSOs comparing their IR and CO luminosities.We find a negative correlation between AGN relative strength and gas depletion time,which is consistent with the QSO evolutionary model.关键词
分子气体/类星体/宽发射线/引力透镜Key words
molecular gas/quasars/broad emission lines/gravitational lensing分类
天文与地球科学引用本文复制引用
刘丰源,戴昱,吴京文..富尘埃宽发射线类星体的CO发射[J].天文学进展,2023,41(4):529-545,17.基金项目
国家重点研发计划(2022YFA1605300) （2022YFA1605300）
国家自然科学基金(12273051,11933003) （12273051,11933003）
