莱曼α森林中的星系外流信号
首发时间:2017-05-13
摘要:恒星形成星系通常都有强烈的外流,这些外流会把星系周围中性的星系际介质(IGM)向外吹出,从而在莱曼α森林上留下无吸收间隙。我们利用红移在3到3.5的三个高分辨率类星体光谱,通过我们的解析模型,对不同大小的无吸收间隙的丰度做了分析。这些间隙的统计性质与我们模型给出的结果符合的很好,即质量在10的10次方个太阳质量以上的星系晕产生的气泡的特征半径约在0.48Mpc/h。这两个值与理论上的预期相符,而且观测到的间隙基本上被很深的吸收特征包围,这与外流吹出的气体会堆积在气泡壁上的物理图像一致。
关键词: 天体物理 天体光谱分析 星系际介质 吸收线 吸收光谱
For information in English, please click here
Observing galactic outflows in the Lyα forest
Abstract:Strong outflows from star-forming galaxies can push the intergalactic medium surrounding a galaxy away. When observing the Lyα forest of a distant quasar, such systems in the foreground can produce segments in the Lyα forest without any absorption, or absorption-free gaps. We have analyzed several high resolutionspectra of quasars at high redshifts. The gap statistics agrees well with a model in which galactic halos above a minimum mass scale of ten to the tenth solar mass produce bubbles with a characteristic radius of 0.48 Mpc/h. Both numbers are consistent with theoretical expectations, where the minimum galaxy mass reflects the threshold for infall of gas out of a photo-ionized IGM.The observed gaps are typically bounded by deep absorption features as expected from the accumulation of swept-up galactic outflows in the Lyα forest gas on the bubble walls.
Keywords: astrophysics astronomy spectrum analysis intergalactic medium absorption line absorption spectra
论文图表:
引用
No.4731308119798214****
同行评议
共计0人参与
勘误表
莱曼α森林中的星系外流信号
评论
全部评论0/1000