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arXiv 1602.07070astro-ph.GAastro-ph.CO
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NGC 7130中CO(6-5)线发射的ALMA成像

ALMA Imaging of the CO(6-5) Line Emission in NGC 7130

Yinghe Zhao, Nanyao Lu, C. Kevin Xu, Yu Gao, Loreto Barcos-Munoz, Tanio Diaz-Santos, Philip Appleton, Vassilis Charmandaris, Lee Armus, Paul van der Werf, Aaron… 展开作者

Yinghe Zhao, Nanyao Lu, C. Kevin Xu, Yu Gao, Loreto Barcos-Munoz, Tanio Diaz-Santos, Philip Appleton, Vassilis Charmandaris, Lee Armus, Paul van der Werf, Aaron Evans, Chen Cao, Hanae Inami, Eric Murphy

摘要:

在本文中,我们报告了我们的高分辨率($0^{\prime\prime}.20\times0^{\prime\prime}.14$或$\sim$ $70\times49$ pc)观测CO(6-5)线发射,探测温暖和致密的分子气体,和434 $μ$ m尘埃连续体在NGC 7130的核区域,获得的阿塔卡马大毫米阵列(ALMA)。在ALMA观测中探测到的CO线和尘埃连续通量分别为$1230\pm74$ Jy km $^{-1}$和$814\pm52$ mJy,分别占其总通量的100%和51%。我们发现,CO(6-5)和粉尘排放量一般是空间相关的,但它们最亮的峰值显示$\sim$ 70 pc的偏移,这表明气体和粉尘排放量可能会开始在这个物理尺度解耦。CO(6-5)发射的最亮峰在空间上与射电连续峰不对应,这可能是由活动星系核(AGN)主导的。结合我们的定量分析,这表明活动星系核对NGC 7130中CO(6-5)辐射的加热贡献可以忽略不计。CO(6-5)和消光校正的Pa- $α$图显示出惊人的差异,这表明在$<$ 100 pc的线性尺度下,温暖的致密气体和恒星形成之间的相关性被打破,或者我们对观测到的Pa- $α$图的消光校正存在很大的不确定性。在$\sim$ 2.1\,kpc的更大尺度上,CO(6-5)发射中发现的双瓣结构与光学/近红外图像中的尘埃带吻合得很好。

英文摘要:

In this paper, we report our high-resolution ($0^{\prime\prime}.20\times0^{\prime\prime}.14$ or $\sim$$70\times49$ pc) observations of the CO(6-5) line emission, which probes warm and dense molecular gas, and the 434 $μ$m dust continuum in the nuclear region of NGC 7130, obtained with the Atacama Large Millimeter Array (ALMA). The CO line and dust continuum fluxes detected in our ALMA observations are $1230\pm74$ Jy km s$^{-1}$ and $814\pm52$ mJy, respectively, which account for 100% and 51% of their total respective fluxes. We find that the CO(6-5) and dust emissions are generally spatially correlated, but their brightest peaks show an offset of $\sim$70 pc, suggesting that the gas and dust emissions may start decoupling at this physical scale. The brightest peak of the CO(6-5) emission does not spatially correspond to the radio continuum peak, which is likely dominated by an Active Galactic Nucleus (AGN). This, together with our additional quantitative analysis, suggests that the heating contribution of the AGN to the CO(6-5) emission in NGC 7130 is negligible. The CO(6-5) and the extinction-corrected Pa-$α$ maps display striking differences, suggestive of either a breakdown of the correlation between warm dense gas and star formation at linear scales of $<$100 pc or a large uncertainty in our extinction correction to the observed Pa-$α$ image. Over a larger scale of $\sim$2.1\,kpc, the double-lobed structure found in the CO(6-5) emission agrees well with the dust lanes in the optical/near-infrared images.

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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