0420034

We propose to continue the monitoring of GRS 1915+105 and its surroundings during AO4 with a strategy somewhat different than the ones we previously adopted hence with slightly different scientific goals. Instead of having 100 ks pointings (which allowed us to explore the high energies) we want 20 ks pointings in order to understand the origin of its high variability and to probe the hierarchichal evolution between classes they should be taken every second revolution. We will finally obtain time resolved spectra of all states. The simultaneous use of JEM-X in the soft X-rays IBIS and SPI in the soft Gamma-rays will enable us to study the origin of the spectral transitions giving birth to a particular class of variability. We aim at studying the interplay between the soft and hard X-ray components the different time scales of their variations in relation with different physical models and the tight connection between the accretion and ejection processes. For this purpose we will provide simultaneous radio (Ryle VLA GMRT Nancay) and infrared (Sierra NevadaESO) observations. IBIS and JEM-X are the prime instruments for this study. Although GRS 1915+105 is the main target of our study we outline here that amongst the ~10 sources usuallyobserved in this field our team aims at studying a handful of them with particular interest on IGR J19140+0951 (which is always in the totally coded field of view of IBIS and detectable with JEM-X) with the view to study its spectral behaviour/evolution (along its known orbit) and survey Ser X-1 Aql X-1 XTE J1908+094 (in the TCFOV) the latter 2 are transient and monitor their X-ray evolution along a possible outburst. For these particular sources multi-wavelength observations will also be conducted. We request that our observations be undertaken in segments of 20 ks exposures during the entire visibility period of 6 months once every second revolution hence 30 po [truncated! Please see actual data for full text]

本研究提议在第四次观测机会计划（AO4）期间，持续监测微类星体GRS 1915+105及其周边天区，采用与此前不同的观测策略，因此科学目标亦略有调整。相较于此前采用的100千秒指向观测（该方案可用于探索高能辐射），本次计划采用20千秒指向观测，以厘清其强变异性的起源，并探究不同变异性类别间的层级演化关系；观测将每两次公转周期执行一次。最终我们将获取所有观测状态下的时间分辨光谱。通过同时使用软X射线探测器JEM-X，以及软γ射线探测器IBIS与SPI，我们可研究诱发特定变异性类别的光谱跃迁起源。本研究旨在探究软X射线与硬X射线成分间的相互作用、不同变化时标与相关物理模型的关联，以及吸积与抛射过程间的紧密联系。为此，我们将同步开展射电（莱尔斯射电望远镜Ryle、甚大阵VLA、巨米波射电望远镜GMRT、南希射电望远镜Nancay）与红外（内华达山脉天文台、欧洲南方天文台ESO）观测。IBIS与JEM-X为本研究的核心观测仪器。尽管GRS 1915+105为本研究的核心目标，但我们在此说明：在该天区通常观测的约10个源中，研究团队还将重点关注其中数个源，尤其关注IGR J19140+0951——该源始终处于IBIS的全编码视场（TCFOV）内，且可被JEM-X探测到——以研究其（沿已知轨道的）光谱行为与演化；同时我们将巡天观测天蝎座X-1（Ser X-1）、天鹰座X-1（Aql X-1）以及暂现源XTE J1908+094（同样处于TCFOV内），后两者均为暂现源，我们将监测其在可能爆发期间的X射线演化。针对上述特殊源，我们也将开展多波段观测。我们请求在总计6个月的观测窗口期内，每两次公转周期执行一次20千秒的曝光分段观测，总计约30次[文本已截断，请参阅完整原始数据以获取全部内容]。