标题： 活动星系核/星暴连接的作用：NGC 1365 的五十万秒 RGS 光谱 显示英文标题

标题： AGN/starburst connection in action: the half million second RGS spectrum of NGC1365

摘要： 我们展示了用XMM-Newton卫星上的反射光栅光谱仪（RGS）收集的NGC1365的深 (~5.8天) 0.3-2 keV高分辨率光谱。 该光谱主要由碳到硅的He-和H-like跃迁的强再结合线以及FeXVII的L跃迁主导。 连续谱很强，特别是在10到20埃范围。 形式拟合需要两个光学薄、碰撞电离的等离子体组分，温度约为300和640 eV。 然而，它们未能解释He-alpha OVII和NVII三重态的大部分禁戒成分。 这些特征可以被解释为由光致电离气体产生。 因此，NGC1365是第一个高分辨率X射线光谱既需要碰撞电离又需要光致电离的受阻挠的活动星系核（AGN）。 光致电离的相对弱性并不是由于其AGN固有的弱性，其X射线亮度约为10^{42} erg/s。 我们建议，它可能是因为从活跃核到窄线区的视线被宽线区中的光学厚物质阻挡，同时这也是导致遮蔽X射线活跃核的柱密度观测到大变化的原因。 或者，与AGN吸积功率相比，NGC1365可能拥有一个显著明亮的核星爆[摘要]。 显示英文摘要

摘要： We present a deep (~5.8 days) 0.3-2 keV high-resolution spectrum of NGC1365, collected with the reflection grating spectrometer (RGS) on board XMM-Newton. The spectrum is dominated by strong recombination lines of He- and H-like transitions from carbon to silicon, as well as by L transitions from FeXVII. The continuum is strong, especially in the 10 to 20 Angstrom, range. Formal fits require two optically thin, collisionally ionised plasma components, with temperatures ~300 and ~640 eV. However, they leave the bulk of the forbidden components of the He-alpha OVII and NVI triplets unaccounted for. These features can be explained as being produced by photoionised gas. NGC1365 is therefore the first obscured AGN, whose high-resolution X-ray spectrum requires both collisional ionisation and photoionisation. The relative weakness of photoionisation does not stem from the intrinsic weakness of its AGN, whose X-ray luminosity is ~10^{42} erg/s. We suggest that it may instead come from the line-of-sight from the active nucleus to the NLR being blocked by optically thick matter in the broad line region, at the same time responsible for the large observed variation of the column density obscuring the X-ray active nucleus. Alternatively, NGC1365 could host a remarkably luminous nuclear starburst when compared to the AGN accretion power [abriged].