2020/02/12 by Yinghe Zhao (赵应和), Yinghe Zhao, Nanyao Lu +9
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Black-body radiation #Emission spectrum #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Line (geometry) #Luminosity #Redshift #Spectral energy distribution #Submillimeter Array #astro-ph.GA
paper · pdf · doi:10.3847/1538-4357/ab75eb
published as ApJ, 892, 145 (2020) · 8 pages, 6 figures, accepted for publication in ApJ
arxiv created 2020/02/12 · openalex created_date 2020/02/24 · openalex publication_date 2020/04/01 · arxiv updated 2020/04/08 · openalex updated_date 2026/08/06
Abstract In this paper we present our imaging observations on the CO (7−6) line and its underlying continuum emission of the young submillimeter galaxy LESS 073 at redshift 4.755, using the Atacama Large Millimeter/submillimeter Array. At the achieved resolution of ∼ (8 × 6 kpc 2 ), the CO (7−6) emission is largely unresolved (with a deconvolved size of ), and the continuum emission is totally unresolved. The CO (7−6) line emission has an integrated flux of 0.86 ± 0.08 Jy km s −1 , and a line width of 343 ± 40 km s −1 . The continuum emission has a flux density of 0.51 mJy. By fitting the observed far-infrared spectral energy distribution (SED) of LESS 073 with a single-temperature modified blackbody function, we obtained a dust temperature K, 60–100 μ m flux density ratio , and total infrared luminosity . The SED-fit-based is consistent with those estimated from various line ratios as advocated by our earlier work, indicating that the proposed line-ratio-based method can be used to practically derive for high- z sources. The total molecular gas mass of LESS 073 is , and the inferred gas depletion time is about 43 Myr.