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arXiv 0707.4243astro-ph
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SS 433微类星体喷流与W 50射电连续壳相互作用的深光学观测

Deep optical observations of the interaction of the SS 433 microquasar jet with the W 50 radio continuum shell

P. Boumis, J. Meaburn, J. Alikakos, M. P. Redman, S. Akras, F. Mavromatakis, J. A. Lopez, A. Caulet, C. D. Goudis

摘要:

四个马赛克深,连续减,CCD图像已获得广泛的银河系无线电连续壳,W 50,它包围着显着的恒星系统SS 433。其中两个在H α +[N II]和[O III] 5007 A发射谱线上的镶嵌体分别覆盖了约2.3 x 2.5 degr ^2的视场,其中包含了所有的W 50,但角分辨率较低,只有5角秒。第三和第四幅镶嵌图分别覆盖了东部(在[O III] 5007 A中)和西部(在H α +[N II]中)的对流星云,但角分辨率为1角秒。这些意见补充了新的低色散光谱和长缝,空间分辨中阶梯光栅光谱。[O III] 5007 A图像首次显示了这种发射在东部和西部暗条中的分布,同时在这两个区域也发现了新的H α +[N II]发射特征。从明亮的东方灯丝的微弱发射的物质的接近流的径向速度高达100公里/秒的检测。观测结果还表明,整个系统的日心系统径向速度为56 ± 2 km/s。此外,W50北部射电脊的一小部分的非常深的图像和高分辨率光谱首次揭示了与该边缘相关的非常微弱的光学星云。这表明,沿~5千秒差距视线的片状前景尘埃抑制了与W 50相关的所有光学星云的检测。讨论了SS 433微类星体喷流与W50壳层的相互作用.

英文摘要:

Four mosaics of deep, continuum-subtracted, CCD images have been obtained over the extensive galactic radio continuum shell, W 50, which surrounds the remarkable stellar system SS 433. Two of these mosaics in the Halpha+[N II] and [O III] 5007 A emission lines respectively cover a field of ~2.3 x 2.5 degr^2 which contains all of W 50 but at a low angular resolution of 5 arcsec. The third and fourth mosaics cover the eastern (in [O III] 5007 A) and western (in Halpha+[N II]) filamentary nebulosity respectively but at an angular resolution of 1 arcsec. These observations are supplemented by new low dispersion spectra and longslit, spatially resolved echelle spectra. The [O III] 5007 A images show for the first time the distribution of this emission in both the eastern and western filaments while new Halpha+[N II] emission features are also found in both of these regions. Approaching flows of faintly emitting material from the bright eastern filaments of up 100 km/s in radial velocity are detected. The present observations also suggest that the heliocentric systemic radial velocity of the whole system is 56+-2 km/s. Furthermore, very deep imagery and high resolution spectroscopy of a small part of the northern radio ridge of W 50 has revealed for the first time the very faint optical nebulosity associated with this edge. It is suggested that patchy foreground dust along the ~5 kpc sightline is inhibiting the detection of all of the optical nebulosity associated with W 50. The interaction of the microquasar jets of SS 433 with the W 50 shell is discussed.

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