arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2102.10187astro-ph.GA
收藏

连接银河系外流和恒星形成:从H-α地图和1 < z < 1.5吸收线光谱推断

Connecting Galactic Outflows and Star Formation: Inferences from H-alpha Maps and Absorption Line Spectroscopy at 1 < z < 1.5

Nikolaus Z. Prusinski, Dawn K. Erb, Crystal L. Martin

摘要:

我们使用两个独立的数据集,涵盖了$1 \lesssim z \lesssim 1.5$之间的22个星系的样本,研究星系外流和恒星形成之间的联系。HST WFC 3/G141棱栅提供低光谱分辨率,高空间分辨率光谱产生H $α$发射线地图,我们测量的空间范围和强度的恒星形成。在静止框架近紫外,凯克/DEIMOS观察Fe II和Mg II星际吸收线,这提供了对外流的强度和速度的限制。我们比较流出的性质,从个人和复合光谱的恒星形成率(SFR)和SFR面密度(SigmaSFR),以及恒星质量和特定的恒星形成率(sSFR)。Fe II和Mg II的等效宽度(EW)增加与SFR和SigmaSFR在$\gtrsim 3σ$的意义,而复合光谱显示较大的Fe II EW和流出速度的星系具有较高的SFR,SigmaSFR,和sSFR。复合光谱的吸收线轮廓进一步表明子样品之间的差异是由流出物而不是ISM驱动的。虽然这些结果与以前的研究是一致的,H $α$图像的使用使它们成为迄今为止$z>1$恒星形成和外流之间关系的最直接的测试。未来的设施,如詹姆斯韦伯太空望远镜和即将到来的超大望远镜将扩展这些直接的,基于H $α$的研究,以降低质量和恒星形成率,探测星系属性的数量级之间的星系反馈,并增强我们在这里发现的相关性。

英文摘要:

We investigate the connection between galactic outflows and star formation using two independent data sets covering a sample of 22 galaxies between $1 \lesssim z \lesssim 1.5$. The HST WFC3/G141 grism provides low spectral resolution, high spatial resolution spectroscopy yielding H$α$ emission line maps from which we measure the spatial extent and strength of star formation. In the rest-frame near-UV, Keck/DEIMOS observes Fe II and Mg II interstellar absorption lines, which provide constraints on the intensity and velocity of the outflows. We compare outflow properties from individual and composite spectra with the star formation rate (SFR) and SFR surface density (SigmaSFR), as well as the stellar mass and specific star formation rate (sSFR). The Fe II and Mg II equivalent widths (EWs) increase with both SFR and SigmaSFR at $\gtrsim 3σ$ significance, while the composite spectra show larger Fe II EWs and outflow velocities in galaxies with higher SFR, SigmaSFR, and sSFR. Absorption line profiles of the composite spectra further indicate that the differences between subsamples are driven by outflows rather than the ISM. While these results are consistent with those of previous studies, the use of H$α$ images makes them the most direct test of the relationship between star formation and outflows at $z>1$ to date. Future facilities such as the James Webb Space Telescope and the upcoming Extremely Large Telescopes will extend these direct, H$α$-based studies to lower masses and star formation rates, probing galactic feedback across orders of magnitude in galaxy properties and augmenting the correlations we find here.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑