THE TIME EVOLUTION OF HH 1 FROM FOUR EPOCHS OF HST IMAGES

THE TIME EVOLUTION OF HH 1 FROM FOUR EPOCHS OF HST IMAGES
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从 HST 图像的四个纪元来看 HH 1 的时间演化

DOI:
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发表时间:
2016
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通讯作者:
J. Bally
J. Bally
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作者:
A. Raga;B. Reipurth;A. Esquivel;J. Bally

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我们分析了HH 1的Hα和[S ii] λλ 6716/6731哈勃太空望远镜(HST)图像的四个时期。对于确定自行,我们探索了一种新的方法的基础上的空间退化图像的分析得到卷积的图像与小波函数的选择的宽度。通过此过程,我们能够生成沿流出轴沿着和跨流出轴的自行速度图,以及(角度积分)自行速度分布图。从四个可用的时代,我们发现的速度,强度和空间分布的线发射的时间演化。我们发现,在过去的二十年中,HH 1显示出明显的加速。此外,Hα和[S ii]强度首先下降,然后在最近(2014年)的图像中恢复。最后,我们比较了[O iii] λ 5007的两个可用HST时期(1994年和2014年),其中我们看到[O iii]/Hα比率的值明显下降。
We present an analysis of four epochs of Hα and [S ii] λλ 6716/6731 Hubble Space Telescope (HST) images of HH 1. For determining proper motions, we explore a new method based on the analysis of spatially degraded images obtained convolving the images with wavelet functions of chosen widths. With this procedure, we are able to generate maps of proper motion velocities along and across the outflow axis, as well as (angularly integrated) proper motion velocity distributions. From the four available epochs, we find the time evolution of the velocities, intensities, and spatial distribution of the line emission. We find that over the last two decades HH 1 shows a clear acceleration. Also, the Hα and [S ii] intensities first dropped and then recovered in the more recent (2014) images. Finally, we show a comparison between the two available HST epochs of [O iii] λ 5007 (1994 and 2014), in which we see a clear drop in the value of the [O iii]/Hα ratio.