Nobeyama 45 m CO J = 1–0 observations of luminous type 1 AGNs at z ≈ 0.3
Nobeyama 45 m CO J = 1–0 observations of luminous type 1 AGNs at z ≈ 0.3
复制标题
DOI：
10.1093/pasj/psad039
复制
发表时间：
2023-06
影响因子：
2.3
通讯作者：
T. Michiyama;Ming-Yang Zhuang;J. Shangguan;Hassen M. Yesuf;H. Kaneko;L. Ho
中科院分区：
文献类型：
--
作者：
T. Michiyama;Ming-Yang Zhuang;J. Shangguan;Hassen M. Yesuf;H. Kaneko;L. Ho
我们用Nobeama 45m射电望远镜对10个拥有发光(LBOL>；1046erg S−1)1型活动星系核(AGN)的星系进行了CO J=1-0观测。之所以选择这些目标，是因为基于它们高度的星云尘埃消光(AV)，预计它们将含有丰富的分子气体。然而，在任何目标中都没有检测到显著的CO发射线。根据星云AV推断出的分子气体质量，CO J=1-0光度的上限比预期的要低。这种不一致可能是由于缺少恒星吸收校正而高估了AV值。考虑到更可靠的AV值，Nobeama 45m的COJ=1-0无检测是很自然的。这表明我们的结果与文献中提出的从AV值到分子气体质量的转换方法并不矛盾。这项调查表明，仍然需要仔细的AV测量和CO观测，以改进对拥有发光活动星系核的星系的分子气体含量的测量或估计。
We have performed CO J = 1–0 observations of 10 galaxies hosting luminous (Lbol > 1046 erg s−1) type 1 active galactic nuclei (AGNs) with the Nobeyama 45 m radio telescope. The targets are selected because they are expected to be rich in molecular gas based on their high nebular dust extinction (AV). However, no significant CO emission lines were detected in any of the targets. The upper limits of the CO J = 1–0 luminosities are lower than expected given the molecular gas mass inferred from the nebular AV. This inconsistency may be due to overestimated AV values due to the lack of stellar absorption correction. Considering more reliable AV values, the CO J = 1–0 non-detections by Nobeyama 45 m are natural. This suggests that our results do not contradict the conversion methods from AV to molecular gas mass proposed in the literature. This survey suggests that careful AV measurements as well as CO observations are still needed to improve the measurements or estimates of the molecular gas content of galaxies hosting luminous AGNs.