论文标题
$γ-$γ-$ ray检测到的窄线seyfert 1星系的光学变异性1星系
Intra-night optical variability of $γ-$ray detected narrow-line Seyfert 1 galaxies
论文作者
论文摘要
我们报告了第一次尝试系统地表征狭窄的seyfert1星系（NLSY1S）的罕见和神秘子集的夜间光学可变性（INOV）的尝试，该子集以$γ$ -Ray频段中的检测为标志，因此与多普勒（Doppler）增强的相对性Jets（例如Blazars）相结合。但是，认为这两种类型的AGN中的中央发动机以不同的增生率制度运行。我们在36次监控会议中进行了一个相当大的且无偏见的15 $γ$ -ray nlsy1s的INOV搜索，每个搜索量是持续的$ \ geq $ 3小时。在我们的分析中，已经采取特殊护理来解决对差异光曲线的可能影响，这是会话期间观察盘的任何差异，因为这可能会导致INOV从这种AGN提出虚假的INOV主张，这是因为宿主星系对总光学发射产生了重大贡献。从我们的观察结果中，$γ$ -Ray nlsy1s中INOV检测的占空比（DC）估计约为25％至30％，与Blazars相当。 DC的这种估计值可能需要向上修订，一旦有可能纠正AGN稀释AGN的非热光学发射，而（稳定）的光学排放不仅由宿主星系造成了贡献，而且还由这些高埃德丁顿速率积累的核积聚盘造成了贡献。最后，我们还注意与Blazars相比，$γ$ -Ray nlsy1s的急剧光通量变化在$γ$ -Ray nlsy1s的可能性较小。
We report the first attempt to systematically characterise intra-night optical variability (INOV) of the rare and enigmatic subset of Narrow-Line Seyfert1 galaxies (NLSy1s), which is marked by detection in the $γ$-ray band and is therefore endowed with Doppler boosted relativistic jets, like blazars. However, the central engines in these two types of AGN are thought to operate in different regimes of accretion rate. Our INOV search in a fairly large and unbiased sample of 15 $γ$-ray NLSy1s was conducted in 36 monitoring sessions, each lasting $\geq$ 3 hrs. In our analysis, special care has been taken to address the possible effect on the differential light curves, of any variation in the seeing disc during the session, since that might lead to spurious claims of INOV from such AGN due to the possibility of a significant contribution from the host galaxy to the total optical emission. From our observations, a duty cycle (DC) of INOV detection in the $γ$-ray NLSy1s is estimated to be around 25% - 30%, which is comparable to that known for blazars. This estimate of DC will probably need an upward revision, once it becomes possible to correct for the dilution of the AGN's nonthermal optical emission by the (much steadier) optical emission contributed not only by the host galaxy but also the nuclear accretion disc in these high Eddington rate accretors. Finally, we also draw attention to the possibility that sharp optical flux changes on sub-hour time scale are less rare for $γ$-ray NLSy1s, in comparison to blazars.
