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

作     者：Lars Fuhrmann Vassilis Karamanavis Stefanie Komossa Emmanouil Angelakis Thomas E Krichbaum Robert Schulz Annika Kreikenbohm Matthias Kadler Ioannis Myserlis Eduardo Ros Ioannis Nestoras J. Anton Zensus 

作者机构：Max-Planck-Institut fur Radioastronomie Auf dem Htigel 69 D-53121 Bonn Germany Le-hrstuhl ftir Astronomie Universitat Wtirzburg Campus Hubland Nord Emil-Fischer-StralBe 31 D-97074 Wtirzburg Germany Dr. Karl Remeis-Sternwarte & Erlangen Centre for Astroparticle Physics Sternwartstr. 7 D-96049 Bamberg Germany Observatori Astronbmic Universitat de Valencia C/Catedraitico Jose Beltran 2 46980 Paterna Valencia Spain Departament d'Astronomia i Astroffsica Universitat de Valencia C/Dr. Moliner 50 46100 Burjassot Valencia Spain 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2016年第16卷第11期

页      面：87-98页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：a stipend from the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne supported by the Deutsche Forschungsgemeinschaft grant WI 1860/10-1 partial support by the the Spanish MINECO project AYA2012-38491-C02-01 by the Generalitat Valenciana project PROMETEOII/2014/057 

主　　题：galaxies: active -- galaxies: jets -- galaxies: individual: 1H 0323+342 -- -) -rays: galaxies 

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 （AGNs）. 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 NLS 1 galaxy 1H 0323＋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 six components with apparent speeds of 1 - 7 c, and one quasi-stationary feature. Combining the obtained apparent jet speed （βapp） and variability Doppler factor （Dvar） estimates together with other methods, we constrain the viewing angle 0 towards 1H 0323＋342 to 0 ≤ 4°-13°. Using literature values of βapp and Dvar, we also deduce a viewing angle of 〈8°-9° towards another radio- and γ-ray-loud NLS1, namely SBS 0846＋513.