论文标题
根据明智数据的近红外通量变异性测量AGN尘埃灭绝
Measurement of AGN dust extinction based on the near-infrared flux variability of WISE data
论文作者
论文摘要
我们介绍了基于近红外（NIR）波长的可变通量分量的颜色的红色，对大量遮盖的活性银河核（AGN）进行了尘土圆环的测量。我们通过$ \ textit {宽阔的红外调查探索者（Wise）} $收集了长期监控数据，用于513个本地AGN，由$ \ Mathit {swift/} $ bat agn光谱调查（贝斯）分类，并发现了两个不同的乐队中的多poch Nir Flux数据（$ WISE $ W1 $ W2 $），目标。 $ W1 $和$ W2 $频段中的通量变化梯度（FVG）是通过应用线性回归分析得出的，我们报告说，毫不掩饰的AGN的频率梯度落在相对较窄的范围内，而被遮盖的AGN的范围则分布在红色范围内。使用FVG中的红色量计算出AGN的视线灰尘灭绝（$ a_v $），并将其与贝司目录的中性氢柱密度（$ n _ {\ rm {} h} $）进行比较。 We found that the $N_{\rm{}H}/A_V$ ratios of obscured AGNs are greater than those of the Galactic diffuse interstellar medium (ISM) and are distributed with a large scatter by at most two orders of magnitude.此外，我们发现$ n _ {\ rm {} h}/a_v $的下部信封可与银河分散的ISM相提并论。 $ n _ {\ rm {} h}/a_v $的这些属性可以通过$ n _ {\ rm {} h} $的增加来解释，归因于覆盖宽线区域的视线的无尘气云。
We present the measurement of the line-of-sight extinction of the dusty torus for a large number of obscured active galactic nuclei (AGNs) based on the reddening of the colour of the variable flux component in near-infrared (NIR) wavelengths. We collected long-term monitoring data by $\textit{Wide-field Infrared Survey Explorer (WISE)}$ for 513 local AGNs catalogued by the $\mathit{Swift/}$BAT AGN Spectroscopic Survey (BASS) and found that the multi-epoch NIR flux data in two different bands (WISE $W1$ and $W2$) are tightly correlated for more than 90% of the targets. The flux variation gradient (FVG) in the $W1$ and $W2$ bands was derived by applying linear regression analysis, and we reported that those for unobscured AGNs fall in a relatively narrow range, whereas those for obscured AGNs are distributed in a redder and broader range. The AGN's line-of-sight dust extinction ($A_V$) is calculated using the amount of the reddening in the FVG and is compared with the neutral hydrogen column density ($N_{\rm{}H}$) of the BASS catalogue. We found that the $N_{\rm{}H}/A_V$ ratios of obscured AGNs are greater than those of the Galactic diffuse interstellar medium (ISM) and are distributed with a large scatter by at most two orders of magnitude. Furthermore, we found that the lower envelope of the $N_{\rm{}H}/A_V$ of obscured AGNs is comparable to the Galactic diffuse ISM. These properties of the $N_{\rm{}H}/A_V$ can be explained by increase in the $N_{\rm{}H}$ attributed to the dust-free gas clouds covering the line of sight in the broad-line region.
