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arXiv 2009.09114astro-ph.SRastro-ph.EPastro-ph.GA
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光学和红外禁戒线联合研究盘风的演化

The Evolution of Disk Winds from a Combined Study of Optical and Infrared Forbidden Lines

I. Pascucci, A. Banzatti, U. Gorti, M. Fang, K. Pontoppidan, R. Alexander, G. Ballabio, S. Edwards, C. Salyk, G. Sacco, E. Flaccomio, G. A. Blake, A. Carmona, C… 展开作者

I. Pascucci, A. Banzatti, U. Gorti, M. Fang, K. Pontoppidan, R. Alexander, G. Ballabio, S. Edwards, C. Salyk, G. Sacco, E. Flaccomio, G. A. Blake, A. Carmona, C. Hall, I. Kamp, H. U. Kaufl, G. Meeus, M. Meyer, T. Pauly, S. Steendam, M. Sterzik

摘要:

我们分析了高分辨率(dv=<10 km/s)的光学和红外光谱,涵盖了[OI] 6300埃和[NeII] 12.81微米线从31个磁盘在不同的演化阶段的样本。在光学波长的工作之后,我们使用高斯轮廓来拟合[NeII]线,并将它们分类为HVC(LVC),如果线质心相对于恒星径向速度的蓝移大于(小于)30 km/s。与HVC通常伴随LVC的[OI]不同,具有[NeII]检测的所有17个源都具有HVC或LVC。[NeII] HVC优先在高吸积物(Macc > 10 $^{-8}$ Msun/yr)中被探测到,而LVC则在低Macc、低[OI]光度和大红外光谱指数(n13-31)的源中被发现。有趣的是,[NeII]和[OI] LVC亮度在n13-31时表现出相反的行为:随着内部尘埃盘耗尽(较高的n13-31),[NeII]亮度增加,而[OI]减弱。[NeII]和[OI] HVC曲线通常与质心和FWHM相似,显示了微射流中冲击气体的预期行为。相比之下,[NeII] LVC轮廓通常比[OI]轮廓更蓝移且更窄。的FWHM和质心与磁盘倾角表明,[NeII] LVC主要跟踪未结合的气体从一个缓慢的,广角的风,还没有完全失去开普勒签名从其发射区域。我们勾画了一个进化的场景,可以解释合并[OI]和[NeII]的结果,包括屏蔽硬(~ 1 keV)X射线在内部,主要是分子,MHD风。

英文摘要:

We analyze high-resolution (dv=<10km/s) optical and infrared spectra covering the [OI] 6300 angstrom and [NeII] 12.81 micron lines from a sample of 31 disks in different evolutionary stages. Following work at optical wavelengths, we use Gaussian profiles to fit the [NeII] lines and classify them into HVC (LVC) if the line centroid is more (less) blueshifted than 30 km/s with respect to the stellar radial velocity. Unlike for the [OI] where a HVC is often accompanied by a LVC, all 17 sources with a [NeII] detection have either a HVC or a LVC. [NeII] HVCs are preferentially detected toward high accretors (Macc > 10$^{-8}$ Msun/yr) while LVCs are found in sources with low Macc, low [OI] luminosity, and large infrared spectral index (n13-31). Interestingly, the [NeII] and [OI] LVC luminosities display an opposite behaviour with n13-31: as the inner dust disk depletes (higher n13-31) the [NeII] luminosity increases while the [OI] weakens. The [NeII] and [OI] HVC profiles are generally similar with centroids and FWHMs showing the expected behaviour from shocked gas in micro-jets. In contrast, the [NeII] LVC profiles are typically more blueshifted and narrower than the [OI] profiles. The FWHM and centroid vs. disk inclination suggest that the [NeII] LVC predominantly traces unbound gas from a slow, wide-angle wind that has not lost completely the Keplerian signature from its launching region. We sketch an evolutionary scenario that could explain the combined [OI] and [NeII] results and includes screening of hard (~1keV) X-rays in inner, mostly molecular, MHD winds.

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