论文标题
不寻常的AGN宿主NGC 1266：具有低光度核的分子气体富分子s0星系中的冲击的证据
The Unusual AGN Host NGC 1266: Evidence for Shocks in a Molecular Gas Rich S0 Galaxy with a Low Luminosity Nucleus
论文作者
论文摘要
NGC 1266是一个主持活性银河核（AGN）的宽性星系（S0），已知包含大量冲击气体。我们比较了中\ emph {j} CO线与与星形成星系（SFGS）的亮度比，然后对CO光谱线能分布（雪橇）进行建模。我们确认在中间和高\ emph {j}区域（$ j _ {\ rm up} $ = 4--13），c-type shock（$ v _ {\ rm s} $ = 25 km s $ s $ s $^{ - 1} { - 1} CM $^{ - 3} $）可以很好地复制CO观测值。星系光谱能分布（SED）由代码{\ tt x-gigale}构造和建模，并获得一组物理参数，包括星形组（SFR，1.17 $ \ pm $ 0.47 \ emph {m $ _ $ _ $ _ {\ odot} $} $} $} $} yr $^{ - 1} $} $} $} $）。另外，我们的工作仅提供来自中性氢区域的[C \，{\ sc ii}]的SFR派生（1.38 $ \ pm $ 0.14 $ M _ {\ odot} $ yr $^{ - 1} $）。先前的研究对NGC 1266核的AGN或Starburst性质得出了虚幻的结论。我们的SED模型表明，系统中的隐藏AGN是本质上低的亮度，因此，AGN的红外光度未达到预期水平。来自\ emph {nustar}硬X射线观察的档案数据显示出边缘检测，不利于遮盖的发光AGN的存在，并暗示紧凑型Starburst在NGC 1266核中更有可能占主导地位。
NGC 1266 is a lenticular galaxy (S0) hosting an active galactic nucleus (AGN), and known to contain a large amount of shocked gas. We compare the luminosity ratio of mid-\emph{J} CO lines to IR continuum with star-forming galaxies (SFGs), and then model the CO spectral line energy distribution (SLED). We confirm that in the mid- and high-\emph{J} regions ($J_{\rm up}$ = 4--13), the C-type shock ($v_{\rm s}$ = 25 km s$^{-1}$, $n_{\rm H}$ = $5\times10^{4}$ cm$^{-3}$) can reproduce the CO observations well. The galaxy spectral energy distribution (SED) is constructed and modeled by the code {\tt X-CIGALE} and obtains a set of physical parameters including the star formation rate (SFR, 1.17 $\pm$ 0.47 \emph{M$_{\odot}$}yr$^{-1}$). Also, our work provides SFR derivation of [C\,{\sc ii}] from the neutral hydrogen regions only (1.38 $\pm$ 0.14 $M_{\odot}$yr$^{-1}$). Previous studies have illusive conclusions on the AGN or starburst nature of the NGC 1266 nucleus. Our SED model shows that the hidden AGN in the system is intrinsically low-luminosity, consequently the infrared luminosity of the AGN does not reach the expected level. Archival data from \emph{NuSTAR} hard X-ray observations in the 3--79 keV band shows a marginal detection, disfavoring presence of an obscured luminous AGN and implying that a compact starburst is more likely dominant for the NGC 1266 nucleus.
