用斯皮策研究形成恒星的矮星系NGC 855

Shen Li, Q. Gu, Yinghe Zhao, Jia-Sheng Huang, Xin-Lian Luo
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引用次数: 1

摘要

我们利用窄带Hα和斯皮策的数据对矮椭圆星系ngc855进行了研究。Hα和斯皮策IRAC图像都证实了ngc855中心的恒星形成活动。从Spitzer IRAC 8.0 μm和MIPS 24 μm发射数据中,我们得到了恒星形成速率(SFR)分别为0.022和0.025M⊙yr−1。HI观测表明,恒星形成活动可能是由一次小型合并引发的。我们还发现在距离NGC 855核约10”的5.8和8.0 μm波段有一个明显的红外发射区。考虑到强8.0 μm但微弱的Hα发射,我们预计这是一个严重模糊的恒星形成区,这需要进一步的光谱观测来证实。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer
We present a study of the dwarf elliptical galaxy NGC 855 using the narrow-band Hα and Spitzer data. Both the Hα and Spitzer IRAC images confirm star-forming activity in the center of NGC 855. We obtained a star formation rate (SFR) of 0.022 and 0.025M⊙ yr−1, respectively, from the Spitzer IRAC 8.0 μm and MIPS 24 μm emission data. The HI observation suggests that the star-forming activity might be triggered by a minor merger. We also find that there is a distinct IR emission region in 5.8 and 8.0 μm bands, located at about 10'' away from the nucleus of NGC 855. Given the strong 8.0 μm but faint Hα emission, we expect that it is a heavily obscured star-forming region, which needs to be confirmed by further optical spectroscopic observations.
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