远距离亮星系Nobeyama分子气体观测的初步结果
Initial Results from the Nobeyama Molecular Gas Observations of Distant Bright Galaxies
摘要：
本文介绍了利用Nobeyama 45米望远镜对高红移星系进行CO巡天的初步结果。使用新的宽带光谱仪配备了一个双光束SIS接收器，我们有强大的新的检测三个高红移（z=1.6-3.4）亚毫米星系（SXDF 1100.001，SDP 9，和SDP 17），一个试探性的检测（SDSS J160705+533558），和一个非检测（COSMOS-AzTEC 1）。在调试阶段观察到的星系是来自以前的光学或宽带submm光谱学的已知光谱红移的来源。高斯拟合得到的分子气体质量和谱线宽度约为10^11 Msun和430-530 km/s，这与以前对遥远的亚毫米星系和类星体的CO观测结果一致。允许最大32 GHz瞬时带宽的光谱仪将在Nobeyama 45 m望远镜上提供新的科学能力，使我们能够在没有任何先前红移信息的情况下确定明亮的submm选定星系的红移。
英文摘要：
We present initial results from the CO survey toward high redshift galaxies using the Nobeyama 45m telescope. Using the new wide bandwidth spectrometer equipped with a two-beam SIS receiver, we have robust new detections of three high redshift (z=1.6-3.4) submillimeter galaxies (SXDF 1100.001, SDP9, and SDP17), one tentative detection (SDSS J160705+533558), and one non-detection (COSMOS-AzTEC1). The galaxies observed during the commissioning phase are sources with known spectroscopic redshifts from previous optical or from wide-band submm spectroscopy. The derived molecular gas mass and line widths from Gaussian fits are ~10^11 Msun and 430-530 km/s, which are consistent with previous CO observations of distant submm galaxies and quasars. The spectrometer that allows a maximum of 32 GHz instantaneous bandwidth will provide new science capabilities at the Nobeyama 45m telescope, allowing us to determine redshifts of bright submm selected galaxies without any prior redshift information.
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