论文标题
H I吸收不同积聚模式的无线电主动银核
H I absorption towards radio Active Galactic Nuclei of different accretion modes
论文作者
论文摘要
We present results of H I absorption experiment done using the Giant Metrewave Radio Telescope (GMRT) towards 27 low- and intermediate-luminosity ($P_{\rm 1.4 GHz}$ $\sim$10$^{23}$-10$^{26}$ W Hz$^{-1}$) radio active galactic nuclei (AGN), classified as either low excitation radio星系（LERGS）或高激发射电星系（HERGS），并具有明智的W2 [4.6 $ $ M] $ - $ W3 [12 $μ$ M] $> $ 2。我们报告了H I对七个无线电AGN的吸收检测，其中六个是新的。结合归类为Lergs或Hergs的文献的其他来源，我们证实了我们较早的结果，即具有WISE COLOR W2 $ -W3 $> 2 $ 2的紧凑型无线电AGN与W2 $ - $ W3 $ <$ 2相比，较高的检测率更高。我们发现，与Lergs（22.0 $^{+3.9} _ {+3.9} _ { - 3.4} $）相比，HERG的吸收检测率更高（37.0 $^{+15.8} _ { - 11.5} $％），主要是由于Herg和Dust com After a Go and STELLAR的人数更大。但是，对于类似的紧凑型无线电结构和具有明智的颜色的宿主星系W2 $ -W3 $> $ 2，我们发现两种类型的AGN的检测率没有任何显着差异，这意味着HI I气体的检测可能不一定意味着高激发模式AGN。我们进一步分析了这些来源的运动学。我们发现，尽管Lergs相对于光学系统性速度的质心速度转移（$ \ sim $ $ - $ - $ -479至$+$ 356 km s $^{ - 1} $），但大多数饲养者的速度速度大多数的速率却小于200 km s $^{ - 1} $，可能是较小的媒介。
We present results of H I absorption experiment done using the Giant Metrewave Radio Telescope (GMRT) towards 27 low- and intermediate-luminosity ($P_{\rm 1.4 GHz}$ $\sim$10$^{23}$-10$^{26}$ W Hz$^{-1}$) radio active galactic nuclei (AGN), classified as either low excitation radio galaxies (LERGs) or high excitation radio galaxies (HERGs) and with WISE colour W2[4.6 $μ$m]$-$W3[12 $μ$m]$>$ 2. We report H I absorption detection towards seven radio AGNs, six of which are new. Combined with other sources from literature classified as LERGs or HERGs, we confirm our earlier result that compact radio AGNs with WISE colour W2$-$W3 $>$2 have higher detection rates compared to those with W2$-$W3 $<$2. We find that H I absorption detection rate is higher for HERGs (37.0$^{+15.8}_{-11.5}$ per cent) compared to LERGs (22.0$^{+3.9}_{-3.4}$ per cent), mainly due to a larger fraction of HERGs being gas and dust rich with a younger stellar population compared to LERGs. However, for similar compact radio structures and host galaxies with WISE colours W2$-$W3$>$2, we don't find any significant difference in detection rates of two types of AGNs implying detection of H I gas may not necessarily mean high excitation mode AGN. We further analysed the kinematics towards these sources. We find that while LERGs show a wide range in the shift of centroid velocities ($\sim$ $-$479 to $+$356 km s$^{-1}$) relative to the optical systemic velocity, most of the HERGs have centroid velocity shift less than 200 km s$^{-1}$, possibly due to differences in jet-interstellar medium interaction.
