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arXiv 1608.03232astro-ph.HE
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内喷流运动学和γ射线窄线Seyfert 1星系1H 0323+342的viewing angle

Inner jet kinematics and the viewing angle towards the γ-ray narrow-line Seyfert 1 galaxy 1H 0323+342

L. Fuhrmann, V. Karamanavis, S. Komossa, E. Angelakis, T. P. Krichbaum, R. Schulz, A. Kreikenbohm, M. Kadler, I. Myserlis, E. Ros, I. Nestoras, J. A. Zensus

摘要:

低质量黑洞的近爱丁顿吸积速率被认为是活动星系核(AGN)窄线塞弗特1(NLS 1)群体多波长特性的主要驱动力。定向效应一直被认为是另一个重要的影响因素,但由于缺乏对这类活动星系核的观测角度,阻碍了详细的研究。在这里,我们提出了多时代,15 GHz VLBA图像(MOJAVE程序)的无线电响亮和费米/LAT检测NLS 1星系1H 323+342。这些都与单碟,多频无线电监测源的可变性,获得与Effelsberg 100米和IRAM 30米望远镜,在F-伽马计划的过程中。VLBA图像揭示了6个明显的速度为~1到~7 c的分量和一个准静态特征。将获得的表观射流速度($β_{app}$)和可变性多普勒因子($D_{var}$)估计与其他方法结合在一起,我们将朝向1H 0323+342的视角约束为$θ\leq 4 - 13$ deg。利用文献值$β_{app}$和$D_{var}$,我们还推导出另一个射电和γ射线强的NLS 1,即SBS 0846+513的视角为$\leq$ 8-9度。

英文摘要:

Near-Eddington accretion rates onto low-mass black holes are thought to be a prime driver of the multi-wavelength properties of the narrow-line Seyfert 1 (NLS1) population of active galactic nuclei (AGN). Orientation effects have repeatedly been considered as another important factor involved, but detailed studies have been hampered by the lack of measured viewing angles towards this type of AGN. Here we present multi-epoch, 15 GHz VLBA images (MOJAVE program) of the radio-loud and Fermi/LAT-detected NLS1 galaxy 1H 323+342. These are combined with single-dish, multi-frequency radio monitoring of the source's variability, obtained with the Effelsberg 100-m and IRAM 30-m telescopes, in the course of the F-GAMMA program. The VLBA images reveal 6 components with apparent peeds of ~1 to ~7 c, and one quasi-stationary feature. Combining the obtained apparent jet speed ($β_{app}$) and variability Doppler factor ($D_{var}$) estimates together with other methods, we constrain the viewing angle towards 1H 0323+342 to $θ\leq 4 - 13$ deg. Using literature values of $β_{app}$ and $D_{var}$, we also deduce a viewing angle of $\leq$ 8-9 deg towards another radio- and γ-ray-loud NLS1, namely SBS 0846+513.

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