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arXiv 0704.2179astro-ph
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超新星遗迹的斯皮策谱线测绘:I。基础数据和主成分分析

Spitzer spectral line mapping of supernova remnants: I. Basic data and principal component analysis

David A. Neufeld, David J. Hollenbach, Michael J. Kaufman, Ronald L. Snell, Gary J. Melnick, Edwin A. Bergin, Paule Sonnentrucker

摘要:

我们报告的光谱映射观测结果进行了对小(1 × 1弧分)区域内的超新星遗迹W 44,W28,IC 443,和3C 391使用斯皮策太空望远镜的红外光谱仪。这些观测覆盖了5.2 - 37微米的光谱区域,总共探测到Ne+、Ne++、Si+、P+、S、S++、Cl+、Fe+和Fe++的15个精细结构跃迁;分子氢的S(0)- S(7)纯转动线;以及氘化氢的R(3)和R(4)跃迁。除了这25条谱线外,还观察到6.2、7.7、8.6、11.3和12.6微米的PAH发射带。大多数检测到的线过渡已被证明足够强大的映射在几个来源,提供了一个全面的图片的相对分布的各种线的排放量观察斯皮策/IRS带通。对谱线图的主成分分析表明,所观测到的发射谱线可分为五组,每组谱线的空间分布各不相同:(1)S和H_2(J > 2)谱线,(2)H_2S(0)谱线,(3)出现电势小于13.6eV的离子谱线,(4)H_2S(0)谱线,(5)H_2S(0)谱线,(6)H_2S(0)谱线,(7)H_2S(0)谱线,(8)H_2S(0)谱线,(9)H_2S(0)谱线,(10)H_2S(0)谱(4)出现电势大于13.6eV的离子谱线,不包括S++;(5)S++谱线。第(1)组的谱线可能起源于受到超新星遗迹内超压驱动的缓慢非离解激波的分子物质,而第(3)-(5)组的谱线主要与具有一定范围(较大)激波速度的离解激波阵面有关。H2 S(0)线显示了低密度的扩散发射成分,在某些来源中,还有激波激发的成分。

英文摘要:

We report the results of spectroscopic mapping observations carried out toward small (1 x 1 arcmin) regions within the supernova remnants W44, W28, IC443, and 3C391 using the Infrared Spectrograph of the Spitzer Space Telescope. These observations, covering the 5.2 - 37 micron spectral region, have led to the detection of a total of 15 fine structure transitions of Ne+, Ne++, Si+, P+, S, S++, Cl+, Fe+, and Fe++; the S(0) - S(7) pure rotational lines of molecular hydrogen; and the R(3) and R(4) transitions of hydrogen deuteride. In addition to these 25 spectral lines, the 6.2, 7.7, 8.6, 11.3 and 12.6 micron PAH emission bands were also observed. Most of the detected line transitions have proven strong enough to map in several sources, providing a comprehensive picture of the relative distribution of the various line emissions observable in the Spitzer/IRS bandpass. A principal component analysis of the spectral line maps reveals that the observed emission lines fall into five distinct groups, each of which may exhibit a distinct spatial distribution: (1) lines of S and H2 (J > 2); (2) the H2 S(0) line; (3) lines of ions with appearance potentials less than 13.6 eV; (4) lines of ions with appearance potentials greater than 13.6 eV, not including S++; (5) lines of S++. Lines of group (1) likely originate in molecular material subject to a slow, nondissociative shock that is driven by the overpressure within the supernova remnant, and lines in groups (3) - (5) are associated primarily with dissociative shock fronts with a range of (larger) shock velocities. The H2 S(0) line shows a low-density diffuse emission component, and - in some sources - a shock-excited component.

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