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VALES - IV. Exploring the transition of star formation efficiencies between normal and starburst galaxies using APEX/SEPIA Band-5 and ALMA at low redshift
Cheng, C.; Ibar, E.; Hughes, T. M.; Villanueva, V.; Leiton, R.; Orellana, G.; Munoz Arancibia, A.; Lu, N.; Xu, C. K.; Willmer, C. N. A.; Huang, J.; Cao, T.; Yang, C.; Xue, Y. Q.; Torstensson, K.
2018
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号475期号:1页码:248-256
摘要In this work, we present new the Swedish-ESO PI receiver for the Atacama Pathfinder Experiment APEX/SEPIA Band-5 observations targeting the CO (J = 2-1) emission line of 24 Herschel-detected galaxies at z = 0.1-0.2. Combining this sample with our recent new Valparafso ALMA Line Emission Survey (VALES), we investigate the star formation efficiencies [SFEs = star formation rate (SFR)/M-H2] of galaxies at low redshift. We find the SFE of our sample bridges the gap between normal star-forming galaxies and Ultra-Luminous Infrared Galaxies (ULIRGs), which are thought to be triggered by different star formation modes. Considering the SFE' as the SFR and the L'(CO) ratio, our data show a continuous and smooth increment as a function of infrared luminosity (or star formation rate) with a scatter about 0.5 dex, instead of a steep jump with a bimodal behaviour. This result is due to the use of a sample with a much larger range of sSFR/sSFR(ms) using LIRGs, with luminosities covering the range between normal and ULIRGs. We conclude that the main parameters controlling the scatter of the SFE in star-forming galaxies are the systematic uncertainty of the alpha(CO) conversion factor, the gas fraction, and physical size.
语种英语
WOS记录号WOS:000427144200020
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条目标识符http://libir.pmo.ac.cn/handle/332002/18073
专题紫金山天文台青海观测站
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Cheng, C.,Ibar, E.,Hughes, T. M.,et al. VALES - IV. Exploring the transition of star formation efficiencies between normal and starburst galaxies using APEX/SEPIA Band-5 and ALMA at low redshift[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,475(1):248-256.
APA Cheng, C..,Ibar, E..,Hughes, T. M..,Villanueva, V..,Leiton, R..,...&Torstensson, K..(2018).VALES - IV. Exploring the transition of star formation efficiencies between normal and starburst galaxies using APEX/SEPIA Band-5 and ALMA at low redshift.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,475(1),248-256.
MLA Cheng, C.,et al."VALES - IV. Exploring the transition of star formation efficiencies between normal and starburst galaxies using APEX/SEPIA Band-5 and ALMA at low redshift".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 475.1(2018):248-256.
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