论文标题
jansky在$ z \ gtrsim 2 $的Hi-Absorptic-Selected星系中的CO（1-0）发射的非常大的阵列检测
Jansky Very Large Array detections of CO(1-0) emission in HI-absorption-selected galaxies at $z \gtrsim 2$
论文作者
论文摘要
我们报告了一个Karl G. Jansky非常大的阵列搜索，从三个Hi-Apsorpting-selected的星系$ z \ 2 $中从三个Hi-Apsorption-selected的星系中排放，这是其CO（3-2）或CO（3-2）或CO（4-3）发射的。我们检测到DLA B1228-113的CO（1-0）排放，$ z \ of 2.1933 $和DLA J0918+1636 at $ z \ of 2.5848 $;这些是高$ z $ HI-HESETECTERED的CO（1-0）排放的第一个检测。我们获得高分子气体质量，$ \ rm m_ {mol} \ oft10^{11} \ times（α_ {\ rm co} /4.36）\ m_ \ m_ \ odot $，用于带有CO（1-0）检测的两个对象，这是$ \ \ of $ \ of $ \ of 1.5-2 $的因素。我们首次在Hi-selected星系中确定了相对于$ j = 1 $级别的中间$ -J $旋转水平的激发，r $ _ {j1} $，获得r $ $ _ {\ rm 31} = 1.00 \ pm0.20 $ _ {\ pm0.20 $ _ { r $ _ {\ rm 31} = 0.86 \ pm0.21 $ dla b1228-113。这些值与$ j = 3,4 $级别的热激发一致。 $ j = 3 $在高选择的星系中的激发与在$ z \ gtrsim2 $处的大量主序列和低下的星系中相似，但比在$ z \ of 1.5 $的主序列星系中高； $ z \ gtrsim2 $的星系激发的较高激发可能是由于它们的较高的星形构型（SFR）表面密度所致。 We use Hubble Space Telescope Wide Field Camera 3 imaging to detect the rest-frame near-ultraviolet emission of DLA B1228-113, obtaining an NUV SFR of $4.44\pm0.47$ M$_{\odot}$ yr$^{-1}$, significantly lower than that obtained from the total infrared luminosity, indicating significant dust extinction in the $ z \大约2.1933 $ galaxy。
We report a Karl G. Jansky Very Large Array search for redshifted CO(1-0) emission from three HI-absorption-selected galaxies at $z \approx 2$, identified earlier in their CO(3-2) or CO(4-3) emission. We detect CO(1-0) emission from DLA B1228-113 at $z\approx2.1933$ and DLA J0918+1636 at $z\approx2.5848$; these are the first detections of CO(1-0) emission in high-$z$ HI-selected galaxies. We obtain high molecular gas masses, $\rm M_{mol}\approx10^{11}\times(α_{\rm CO}/4.36)\ M_\odot$, for the two objects with CO(1-0) detections, which are a factor of $\approx1.5-2$ lower than earlier estimates. We determine the excitation of the mid$-J$ CO rotational levels relative to the $J=1$ level, r$_{ J1}$, in HI-selected galaxies for the first time, obtaining r$_{\rm 31}=1.00\pm0.20$ and r$_{\rm 41}=1.03\pm0.23$ for DLA J0918+1636, and r$_{\rm 31}=0.86\pm0.21$ for DLA B1228-113. These values are consistent with thermal excitation of the $J=3,4$ levels. The excitation of the $J=3$ level in the HI-selected galaxies is similar to that seen in massive main-sequence and sub-mm galaxies at $z\gtrsim2$, but higher than that in main-sequence galaxies at $z\approx1.5$; the higher excitation of the galaxies at $z\gtrsim2$ is likely to be due to their higher star-formation rate (SFR) surface density. We use Hubble Space Telescope Wide Field Camera 3 imaging to detect the rest-frame near-ultraviolet emission of DLA B1228-113, obtaining an NUV SFR of $4.44\pm0.47$ M$_{\odot}$ yr$^{-1}$, significantly lower than that obtained from the total infrared luminosity, indicating significant dust extinction in the $z\approx2.1933$ galaxy.
