论文标题
CO（7-6）线排放的Alma成像在亚毫米星系中少于Redshift 4.755 $^\ star $ 073
ALMA Imaging of the CO(7-6) Line Emission in the Submillimeter Galaxy LESS 073 at redshift 4.755$^\star$
论文作者
论文摘要
在本文中，我们使用Atacama大毫米/毫米阵列（ALMA）介绍了对CO（7-6）线的成像观察及其在RedShift 4.755处的年轻亚毫米级星系的基础连续发射。以$ \ sim $$ 1^{\ prime \ prime} .2 \ times0^{\ prime \ prime} .9 $（$ 8 \ times6 $ 〜kpc $^2 $）的分辨率达到$ 1^{\ prime \ prime} .1（\ pm0^{\ prime \ prime} .5）\ times 0^{\ prime \ prime \ prime} .9（\ pm0^{\ prime \ prime \ prime \ prime \ prime} .8）。 CO（7-6）线排放的集成通量为$ 0.86 \ pm0.08 $ 〜jy km/s，线宽度为$ 343 \ pm40 $ km/s。连续发射的通量密度为0.51 mJY。 By fitting the observed far-infrared (FIR) spectral energy distribution of LESS 073 with a single-temperature modified blackbody function, we obtained a dust temperature $T_{\rm dust}=57.6\pm3.5$ K, 60-to-100 $μ$m flux density ratio $f_{60}/f_{100}=0.86\pm0.08$, and total infrared光度$ l _ {\ rm ir} =（5.8 \ pm0.9）\ times 10^{12} 〜l_ \ odot $。基于SED-FIT的$ f_ {60}/f_ {100} $与我们较早的工作所主张的各种线比估计的估计相一致，这表明那些建议的基于线比的方法可用于实际得出$ f_ {60}/f_ {100} $ for High-$ z $ siedces。较小的073的总分子气质量为$（3.3 \ pm1.7）\ times10^{10} 〜M_ \ odot $，而推断的气体耗竭时间约为43 Myr。
In this paper we present our imaging observations on the CO(7-6) line and its underlying continuum emission of the young submillimeter galaxy LESS 073 at redshift 4.755, using the Atacama Large Millimeter/submillimeter Array (ALMA). At the achieved resolution of $\sim$$1^{\prime\prime}.2\times0^{\prime\prime}.9$ ($8\times6$~kpc$^2$), the CO(7-6) emission is largely unresolved (with a deconvolved size of $1^{\prime\prime}.1(\pm0^{\prime\prime}.5) \times 0^{\prime\prime}.9(\pm0^{\prime\prime}.8)$), and the continuum emission is totally unresolved. The CO(7-6) line emission has an integrated flux of $0.86\pm0.08$~Jy km/s, and a line width of $343\pm40$ km/s. The continuum emission has a flux density of 0.51 mJy. By fitting the observed far-infrared (FIR) spectral energy distribution of LESS 073 with a single-temperature modified blackbody function, we obtained a dust temperature $T_{\rm dust}=57.6\pm3.5$ K, 60-to-100 $μ$m flux density ratio $f_{60}/f_{100}=0.86\pm0.08$, and total infrared luminosity $L_{\rm IR}=(5.8\pm0.9) \times 10^{12}~L_\odot$. The SED-fit-based $f_{60}/f_{100}$ is consistent with those estimated from various line ratios as advocated by our earlier work, indicating that those proposed line-ratio-based method can be used to practically derive $f_{60}/f_{100}$ for high-$z$ sources. The total molecular gas mass of LESS 073 is $(3.3\pm1.7) \times10^{10}~M_\odot$, and the inferred gas depletion time is about 43 Myr.
