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arXiv 2109.07545astro-ph.GAastro-ph.CO
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MUSE极深场:z=1时暗物质主导星系中SFR诱导核的证据

The MUSE Extremely Deep Field: Evidence for SFR-induced cores in dark-matter dominated galaxies at z=1

Nicolas F. Bouché, Samuel Bera, Davor Krajnovic, Eric Emsellem, Wilfried Mercier, Joop Schaye, Benoît Épinat, Johan Richard, Sebastiaan L. Zoutendijk, Valentina… 展开作者

Nicolas F. Bouché, Samuel Bera, Davor Krajnovic, Eric Emsellem, Wilfried Mercier, Joop Schaye, Benoît Épinat, Johan Richard, Sebastiaan L. Zoutendijk, Valentina Abril-Melgarejo, Jarle Brinchmann, Roland Bacon, Thierry Contini, Leindert Boogaard, Lutz Wisotzki, Michael Maseda, Matthias Steinmetz

摘要:

$z>1$上旋转支撑的恒星形成星系(SFG)的盘晕分解通常仅限于大质量星系($M_\star>10^{10}~M_\odot$),并且依赖于深积分场光谱数据或叠加分析。本文研究了9个$z\approx1$ SFG的暗物质含量。利用迄今为止最深的多单元光谱仪探测器(MUSE)场,即140小时的MUSE极深场,我们对9个低质量SFG进行了盘晕分解(与$10^{8.5}<M_\star<10^{10.5}~M_\odot$)使用一种新的三维建模方法,它与精致的S/N一起允许我们测量$3\times R_e$的各个旋转曲线。盘晕分解包括恒星,DM,气体,偶尔一个凸起的组件。DM组件主要使用广义$α,β,γ$曲线或Navarro-Frenk-White(NFW)曲线。由[OII]盘晕分解得到的盘星质量$M_\star$与由光谱能量分布推断的值一致。虽然旋转曲线显示出不同的形状,从上升到下降,在大半径,DM分数内的半光半径$f_{\rm DM}(<R_e)$被发现是60%至95%,扩展到较低的质量(密度)最近的结果与$M_\star>10^{10}~M_\odot$大规模SFG。DM晕显示出$\sim100~M_\odot$ pc $^{-2}$的恒定表面密度。一半的样品显示出强烈的偏好核心的尖突DM配置文件。DM核心的存在似乎与恒星到晕质量为$\log M_\star/M_{\rm vir}\approx-2.5$的星系有关。此外,尖的DM配置文件被发现是一个强大的功能,最近的恒星形成活动。这两个结果都被解释为冷暗物质背景下反馈诱导核心形成的证据。

英文摘要:

Disc-halo decomposition on rotationally supported star-forming galaxies (SFGs) at $z>1$ are often limited to massive galaxies ($M_\star>10^{10}~M_\odot$) and rely on either deep Integral Field Spectroscopy data or stacking analyses. We present a study of the dark matter (DM) content of nine $z\approx1$ SFGs selected Using the brightest [OII] emitters in the deepest Multi-Unit Spectrograph Explorer (MUSE) field to date, namely the 140hr MUSE Extremely Deep Field, we perform disk-halo decompositions on 9 low-mass SFGs (with $10^{8.5}<M_\star<10^{10.5}~M_\odot$) using a novel 3D modeling approach, which together with the exquisite S/N allows us to measure individual rotation curves to $3\times R_e$. The disk-halo decomposition includes a stellar, DM, gas, and occasionally a bulge component. The DM component primarily uses the generalized $α,β,γ$ profile or a Navarro-Frenk-White (NFW) profile. The disk stellar masses $M_\star$ obtained from the [OII] disk-halo decomposition agree with the values inferred from the spectral energy distributions. While the rotation curves show diverse shapes, ranging from rising to declining at large radii, the DM fractions within the half-light radius $f_{\rm DM}(<R_e)$ are found to be 60\% to 95\%, extending to lower masses (densities) recent results on massive SFGs with $M_\star>10^{10}~M_\odot$. The DM halos show constant surface densities of $\sim100~M_\odot$ pc$^{-2}$. Half of the sample shows a strong preference for cored over cuspy DM profiles. The presence of DM cores appears to be related to galaxies with stellar-to-halo mass $\log M_\star/M_{\rm vir}\approx-2.5$. In addition, the cuspiness of the DM profiles is found to be a strong function of the recent star-formation activity. Both of these results are interpreted as evidence for feedback-induced core formation in the Cold Dark Matter context.

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