水超脉泽寄主星系射电特性研究

发布时间：2018-03-23 05:12

本文选题：水脉泽寄主星系　切入点：射电特性　出处：《广州大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文主要对水超脉泽Seyfert2型寄主星系的射电特性进行系统的观测研究。观测使用了德国Effelsberg 100米射电望远镜,在四天时间内对35个有探测到水超脉泽辐射的Seyfert2星系(水超脉泽星系样本)以及25个没有探测到水超脉泽辐射的Seyfert2星系(非水超脉泽星系样本)进行了多波段(11厘米、6.0厘米、3.6cm、2.0cm以及1.3cm波段)的射电连续谱观测。通过使用CLASS软件对数据进行了初步预处理,得出样本源的连续谱图像(信噪比未超过3的源,给出其流量上限),然后再使用TOOLBOX对观测数据进行精细处理,分别进行大气不透明度、天线俯仰增益修正以及流量定标,最终获得流量密度"。对每一个源分别计算了各个波段的射电光度(L_v=4πS_vD~2,其中是光度距离,ν是频率),以及通过假设射电连续谱辐射服从幂律分布(S_v∝ν~(-α),其中是流量密度,是谱指数),分别计算出相邻波段的谱指数。对两个样本进行比较发现,就谱指数而言并没有显著的统计学差异,而在射电光度的对比中发现了统计学的显著差异:水超脉泽Seyfert2星系射电光度比非水超脉泽Seyfert2星系的要高出约2到3倍,水超脉泽星系样本中绝大部分源的射电光度超过10~(29)ergs~(-1)Hz~(-1),并以此作为水超脉泽Seyfert2样本的一个光度限定。另外,本文尝试对水超脉泽寄主星系活动星系核的参数进行限定,对比发现,脉泽Seyfert 2星系比非脉泽Seyfert2星系具有更高的吸积率,约为2倍。利用本文提出的光度限定进行选源并使用了Effelsberg 100米射电望远镜进行试搜寻观测,成功发现一个新的水超脉泽辐射源。
[Abstract]:In this paper, the radio characteristics of the host galaxy of water supermaser Seyfert2 type have been studied systematically. The German Effelsberg 100m radio telescope has been used to observe the radio properties of the host galaxy. Over a period of four days, 35 Seyfert2 galaxies (samples of hydro maser galaxies) with detected hyper maser radiation and 25 Seyfert2 galaxies (non-aqueous maser samples) with no detection of water super maser radiation were studied. The radio continuous spectrum observation of 6.0cm ~ 3.6cm ~ (2. 0 cm) and 1.3cm band) was carried out by using CLASS software to preprocess the data. The continuous spectral image of the sample source (the source whose SNR is not more than 3) is obtained, and the upper limit of the flow rate is given. Then TOOLBOX is used to fine process the observed data for atmospheric opacity, antenna pitch gain correction and flow calibration, respectively. Finally, the flow density is obtained. For each source, the radio luminosity of each band is calculated separately, in which the luminosity distance is the photometric distance, and the v is the frequency, and by assuming the distribution of the radio continuous spectrum radiation from the power law, there is a flow density, which is the flow density, It is the spectral index, which calculates the spectral index of the adjacent bands respectively. Comparing the two samples, we find that there is no significant statistical difference in the spectral index. Statistical differences were found in the comparison of radio luminosity: the jet luminosity of the water super maser Seyfert2 galaxy was about 2 to 3 times higher than that of the non water super maser Seyfert2 galaxy. The radio luminosity of most of the source in the sample of Hyper-maser galaxy exceeds 10 ~ 29ergsfen ~ (-1) ~ (?) ~ (?), which is used as a photometric limit for the Seyfert2 sample. In addition, this paper attempts to limit the parameters of the active galactic nucleus of the host galaxy, and it is found by comparison that the parameters of the hydrohyperetic maser host galaxy's active galactic nucleus (AGNs) are determined. Maser Seyfert 2 galaxy has a higher accretion rate of about 2 times than that of non maser Seyfert2 galaxy. Using the photometric limit proposed in this paper, the source selection is carried out and the Effelsberg 100m radio telescope is used for the search and observation. A new source of water hyper maser radiation was successfully found.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P152;P16

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