论文标题
双双射电星系J0028+0035的多频研究
Multifrequency study of a double-double radio galaxy J0028+0035
论文作者
论文摘要
我们报告发现双双无线电源（DDRS）J0028+0035。我们用Lofar，GMRT和VLA观察了它。通过将我们的观察数据与文献的数据相结合，我们收集了一套可观的无线电通量密度测量值，涵盖了从74 MHz到14 GHz的范围。这使我们能够对源的物理特性及其动态进化分析进行广泛的审查。特别是，我们发现，尽管大规模外叶的年龄约为245 Myr，但直接负责双双结构的射流活动的更新仅在大约11个Myr长时间静止后发生了大约3.6 Myr。 DDRSS的另一个重要特性，此处也存在，内部和外部裂片的注射光谱指数相似。 J0028+0035中的喷气功率也相似。这两种情况都支持我们推断，实际上，它是到目前为止未被认为的DDR，因为存在一个复合的紧凑型物体接近内部双重双重的物体，因此J0028+0035的中心显然是三倍。
We report the discovery of a double-double radio source (DDRS) J0028+0035. We observed it with LOFAR, GMRT, and the VLA. By combining our observational data with those from the literature, we gathered an appreciable set of radio flux density measurements covering the range from 74 MHz to 14 GHz. This enabled us to carry out an extensive review of physical properties of the source and its dynamical evolution analysis. In particular, we found that, while the age of the large-scale outer lobes is about 245 Myr, the renewal of the jet activity, which is directly responsible for the double-double structure, took place only about 3.6 Myr ago after about 11 Myr long period of quiescence. Another important property typical for DDRSs and also present here is that the injection spectral indices for the inner and the outer pair of lobes are similar. The jet powers in J0028+0035 are similar too. Both these circumstances support our inference that it is, in fact, a DDRS which was not recognized as such so far because of the presence of a coincident compact object close to the inner double so that the centre of J0028+0035 is apparently a triple.
