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arXiv 1709.05085astro-ph.IM
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用帕克斯望远镜相控阵馈源进行谱线观测

Spectral-line Observations Using a Phased Array Feed on the Parkes Telescope

Tristan Reynolds, Lister Staveley-Smith, Jonghwan Rhee, Tobias Westmeier, Aaron Chippendale, Xinping Deng, Ron Ekers, Michael Kramer

摘要:

我们目前的第一个结果,从试点观测使用相控阵饲料(PAF)安装在帕克斯64米射电望远镜。这里提出的意见涵盖的频率范围从1150至1480兆赫,并用于显示的能力,PAF抑制驻波问题的一个因素$\sim10$,折磨正常饲料。我们还比较了我们的结果与以前的HIPASS观测和以前的HI图像的大麦云。GAMA G23场的漂移扫描观测导致HIPASS星系J2242-30和J2309-30的$z=0.0043$和$z=0.0055$的直接HI探测。我们的新测量结果与光谱形状和通量密度的档案数据基本一致,由于不同的光束模式而存在微小差异。我们还检测信号的1094个单独的未检测到的星系在GAMA G23领域的红移范围$0.05 \leq z \leq 0.075$的HI数据的堆叠。最后,我们使用低驻波纹波和宽带宽的PAF设置一个$3σ$上限,任何正电子素复合线发射从银河系中心的$<0.09$ K,对应的复合率为$<3.0\times10^{45}\,\mathrm{s}^{-1}$。

英文摘要:

We present first results from pilot observations using a phased array feed (PAF) mounted on the Parkes 64-m radio telescope. The observations presented here cover a frequency range from 1150 to 1480 MHz and are used to show the ability of PAFs to suppress standing wave problems by a factor of $\sim10$ which afflict normal feeds. We also compare our results with previous HIPASS observations and with previous HI images of the Large Magellanic Cloud. Drift scan observations of the GAMA G23 field resulted in direct HI detections at $z=0.0043$ and $z=0.0055$ of HIPASS galaxies J2242-30 and J2309-30. Our new measurements generally agree with archival data in spectral shape and flux density, with small differences being due to differing beam patterns. We also detect signal in the stacked HI data of 1094 individually undetected galaxies in the GAMA G23 field in the redshift range $0.05 \leq z \leq 0.075$. Finally, we use the low standing wave ripple and wide bandwidth of the PAF to set a $3σ$ upper limit to any positronium recombination line emission from the Galactic Centre of $<0.09$ K, corresponding to a recombination rate of $<3.0\times10^{45}\,\mathrm{s}^{-1}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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