巨蛇座中SMM1（FIRS1）的原子喷流揭示了非同时代的双星伴星
Atomic jet from SMM1 (FIRS1) in Serpens uncovers non-coeval binary companion
摘要：
我们报告的原子喷流的检测与原恒星源SMM 1（FIRS 1）在巨蛇座。喷流在Spitzer/IRS观测到的[FeII]和[NeII]线图中显示，并在HiRes IRAC和MIPS图像中得到进一步证实。它的轨迹非常接近SMM 1，峰值在距源约5角秒处，位置角为$ \sim 125度。相比之下，分子氢发射在距离原恒星> 5”处变得突出，并以160度的位置角延伸。形态上的差异表明，原子发射来自一个同伴源，位于嵌入的原恒星SMM 1周围的信封的前景。此外，分子和原子的斯皮策地图解开大规模CO（3-2）的排放在该地区观察到两个不同的双极流出，进一步支持原二进制源设置。对[Fe II]喷流峰值的分析表明，发射来自温暖而致密的气体（T ~1000 K，n（电子）10^5 - 10^6 cm^-3）。根据[FeII]和[NeII]谱线独立推导出的喷流质量通量为10^7 M（太阳）/年，表明驱动源是一颗演化程度更高的I/II类原恒星。所有现有的证据都表明SMM 1是一个非同时代的原始二进制源。
英文摘要：
We report on the detection of an atomic jet associated with the protostellar source SMM1 (FIRS1) in Serpens. The jet is revealed in [FeII] and [NeII] line maps observed with Spitzer/IRS, and further confirmed in HiRes IRAC and MIPS images. It is traced very close to SMM1 and peaks at ~5 arcsec" from the source at a position angle of $\sim 125 degrees. In contrast, molecular hydrogen emission becomes prominent at distances > 5" from the protostar and extends at a position angle of 160 degrees. The morphological differences suggest that the atomic emission arises from a companion source, lying in the foreground of the envelope surrounding the embedded protostar SMM1. In addition the molecular and atomic Spitzer maps disentangle the large scale CO (3-2) emission observed in the region into two distinct bipolar outflows, giving further support to a proto-binary source setup. Analysis at the peaks of the [FeII] jet show that emission arises from warm and dense gas (T ~1000 K, n(electron) 10^5 - 10^6 cm^-3). The mass flux of the jet derived independently for the [FeII] and [NeII] lines is 10^7 M(sun)/yr, pointing to a more evolved Class~I/II protostar as the driving source. All existing evidence converge to the conclusion that SMM1 is a non-coeval proto-binary source.
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