标题： 与GPS星系B1144+352相关的Mpc尺度射电源 显示英文标题

标题： The Mpc-scale radio source associated with the GPS galaxy B1144+352

摘要： 我们展示了使用WSRT在1.4 GHz对神秘射电源B1144+352的新观测结果。WENSS和NVSS巡天揭示了Mpc尺度上的微弱扩展射电结构。我们研究了这些大尺度射电组分。其中一个射电结构具有领先热点，我们得出结论认为该结构是与GPS源相关的大型射电瓣。另一个包含两个在天空上叠加的独立射电源：一个低功率射电源与GPS宿主星系具有相似的红移（z=0.065），以及一个扩展的射电瓣，我们认为该瓣与GPS宿主星系有关。此外，核心在1.4 GHz的流量密度在1994年至1997年间减少了70 mJy。我们还检索并分析了B1144+352未发表的档案ROSAT HRI数据。该源已被检测到，并在X射线中似乎略有扩展。ROSAT数据未检测到围绕宿主星系的大范围X射线晕，将250 kpc半径内的星系团气体亮度限制为小于2.3 x 10^42 erg/s。B1144+352是第二个已知与Mpc尺度射电源相关的GPS星系，另一个是B1245+676。我们认为观测到的结构必定是中断的中心喷流活动的结果，因此这些源可能是双双射电星系的前身。 显示英文摘要

摘要： We present the results of new observations of the enigmatic radio source B1144+352 with the WSRT at 1.4 GHz. The WENSS and NVSS surveys have revealed faint extended radio structures on Mpc-scales. We have investigated these large-scale radio components. One of the radio structures has a leading hotspot and we conclude that this structure is a large radio lobe associated with the GPS source. The other contains two separate radio sources which are superposed on the sky: A low-power radio source at a similar redshift (z=0.065) to the GPS host galaxy and an extended radio lobe, which we believe is associated with the GPS host galaxy. Further, the 1.4-GHz flux density of the core has decreased by 70 mJy between 1994 and 1997. We have also retrieved and analysed unpublished archival ROSAT HRI data of B1144+352. The source has been detected and appears to be slightly extended in X-rays. The ROSAT data have not detected a large extended X-ray halo surrounding the host galaxy, limiting the luminosity of the intra-cluster gas within a radius of 250 kpc to < 2.3 x 10^42 erg/s. B1144+352 is the second GPS galaxy known to be associated with a Mpc-sized radio source, the other being B1245+676. We argue that the observed structures must be the result of an interrupted central jet-activity, and that as such these sources may well be the progenitors of double-double radio galaxies.