HI in radio galaxies: prospects for upcoming wide-field surveys
Bjorn Emonts, Raffaella Morganti, Christian Struve
备注：
6 pages, 2 figures - to appear in PoS, "Panoramic Radio Astronomy: Wide-field 1-2 GHz research on galaxy evolution", Groningen, NL, eds. G. Heald and P. Serra
We present results of an ongoing systematic study of the large-scale properties of neutral hydrogen (HI) gas in nearby radio galaxies. Our main goal is to investigate the importance of gas-rich galaxy mergers and interactions among radio-loud AGN. From an HI study of a complete sample of classical low-power radio galaxies we find that the host galaxies of extended Fanaroff & Riley type-I radio sources are generally HI poor (< 10E8 M_sun) and show no indications for gas-rich galaxy mergers or ongoing gas-rich interactions. In contrast, the host galaxies of a significant fraction of low-power compact radio sources contain enormous discs/rings of HI gas (with sizes up to 190 kpc and masses up to 2 x 10E10 M_sun). This segregation in HI mass with radio source size likely indicates that these compact radio sources are either confined by large amounts of gas in the central region, or that their fueling is inefficient and different from the fueling process of classical FR-I radio sources. To a first order, the overall HI properties of our complete sample (detection rate, mass and morphology) appear similar to those of radio-quiet early-type galaxies. If confirmed by better statistics, this would imply that low-power radio-AGN activity may be a short phase that occurs at some point during the lifetime of many early-type galaxies. We discuss how upcoming HI surveys (e.g. with ASKAP and Apertif) are essential for studying in a statistical way the the connection between the presence and morphology of a radio-loud AGN and the properties of the cold HI gas associated with its host galaxy.
The caustic method applied to The Three Hundred: prospects for upcoming CATARSIS and other surveys
Universidad Complutense de Madrid（马德里康普顿斯大学）；Instituto de Física de Partículas y del Cosmos (IPARCOS-UCM)（粒子与宇宙物理研究所（IPARCOS-UCM））；Universidad Autónoma de Madrid（马德里自治大学）；Centro de Investigación Avanzada en Física Fundamental (CIAFF)（基础物理前沿研究中心（CIAFF））；International center for Radio Astronomy Research, University of Western Australia（西澳大利亚大学国际射电天文研究中心）；Institute for Astronomy, University of Edinburgh（爱丁堡大学天文学研究所）
利用 The Three Hundred 项目数据，通过 caustic 技术研究从即将到来的光谱巡天数据中恢复星系团质量轮廓的预期不确定性，并评估巡天星等极限的影响，重点针对 CATARSIS 巡天进行分析。
Probing Primordial Black Holes with upcoming Radio Telescopes: a case study for LOFAR2.0, FAST Core Array and BINGO
Universidade Federal de Campina Grande（坎皮纳格兰德联邦大学）；Leibniz University Hannover（汉诺威莱布尼茨大学）；Ruprecht-Karls-Universität Heidelberg（海德堡大学）；Max Planck Institute for Gravitational Physics, Albert Einstein Institute（马克斯·普朗克引力物理研究所，爱因斯坦研究所）
Direction Dependent Effects In Wide-Field Wideband Full Stokes Radio Imaging
射电天文中的综合成像受仪器效应和大气效应的影响，引入了方向相关（DD）增益，天线功率方向图是时间和频率的函数。天线功率方向图的宽带时变性质在未经校正时会导致全斯托克斯成像和通量估计中的粗差。在这张海报中，我们探讨了图像反卷积中出现的错误，而不是考虑天线功率模式的时间和频率依赖性。利用Karl G. Jansky甚大阵列（VLA）天线，以证明由方向相关增益产生的误差水平及其对即将进行的天空调查（如VLASS）的不可识别影响。通过混合投影算法的DD校正执行起来在计算上是昂贵的。通过高性能计算架构的高度并行实现是将这些校正应用于这些即将到来的调查的大数据大小的唯一可行方法。
