标题： 马克 1393 中部分遮挡的塞弗特核的X射线吸收和光学消光 显示英文标题

标题： X-ray Absorption and Optical Extinction in the Partially Obscured Seyfert Nucleus in Mrk 1393

摘要： 我们对亮星 Seyfert 星系 Mrk 1393 的X射线和光学光谱进行了详细研究，揭示了活动星系核的部分吸收存在变化。通过 XMM-Newton 和 Swift 获得的X射线光谱显示出适度吸收，柱密度约为 3×10^21 cm^-2，这与最近光学光谱中观测到的陡峭的巴尔末减小的尘埃消红现象一致。在 2005 年 XMM-Newton 观测和 2006 年 Swift 观测的 0.5 至 2 keV 能量范围内，X 射线流量比 1991 年 ROSAT 全天巡天的结果亮了 6 倍。在过去 4 年里，伴随着巴尔末减小的下降，宽 H\alpha 线亮度增加了 4 倍。与文献中的光谱进行比较发现，在几年的时间尺度上存在尘埃消光的变化，表明遮蔽物质非常接近活动星系核。这些观测结果表明，在距离中心引擎几秒差距范围内的中等厚度气体中可能存在与银河系值相当的尘埃-气体比例。我们建议遮蔽物质可能是从尘埃环中被撕裂的碎片。 显示英文摘要

摘要： We present a detailed study of the X-ray and optical spectra of the luminous Seyfert galaxy Mrk 1393, which revealed variable partial obscuration of the active nucleus. The X-ray spectra obtained by XMM-Newton and Swift show moderate absorption with a column density around 3x10^21 cm^-2, consistent with a dust-reddening interpretation of the steep Balmer decrement seen in recent optical spectra. The X-ray flux in the 0.5 to 2 keV band during the XMM-Newton observation in 2005 and Swift observation in 2006 was a factor 6 brighter than that of the ROSAT All Sky Survey in 1991. In the past 4 years, the broad H\alpha line brightened by a factor of 4 accompanied by a decrease in the Balmer decrement. A comparison with literature spectra reveals variations in the dust extinction on time scales of several years, suggesting that the obscuring material is very close to the active nucleus. These observations indicate that a dust-to-gas ratio as high as the Galactic value can be present in moderately thick gas in the vicinity of the central engine within a few parsecs. We suggest that the obscuring material may be debris disrupted from the dusty torus.