A MUSE source-blind survey for emission from the circumgalactic medium

IF 11.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2024-11-20 DOI:10.1126/sciadv.adp8629

Huanian Zhang, Dennis Zaritsky

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Abstract

The recent detection of optical emission lines from the circumgalactic medium (CGM) in combined, large samples of low-redshift, normal galaxy spectra hints at the potential to map the cool (∼10⁴ kelvin) CGM in individual, representative galaxies. Using archival data from a forefront instrument (MUSE) on the VLT, we present a source-blind, wide-redshift-range (z ∼ 0 to 5) narrowband imaging survey for CGM emission. Our detected, resolved emission line sources are cataloged and include a 30-kiloparsec-wide Hα source likely tracing the CGM of a low-mass galaxy (stellar mass ∼ 10^8.78±0.42 solar mass) at z = 0.1723, a 60-kiloparsec-wide Ly α structure associated with a galaxy at z = 3.9076, and a 130-kiloparsec (∼r_vir)–wide [O II] feature revealing an interaction between a galaxy pair at z = 1.2480. The Hα velocity field for the low-mass galaxy suggests that the CGM is more chaotic or turbulent than the galaxy disk, while that for the interacting galaxies shows large-scale (∼50 kiloparsec) coherent motions.

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环银河介质发射的 MUSE 盲源观测。

最近在低红移、正常星系光谱的大型组合样本中探测到了来自环银河介质（CGM）的光学发射线，这为绘制具有代表性的单个星系的冷（104 开尔文）环银河介质图提供了可能。我们利用 VLT 上一个前沿仪器（MUSE）的档案数据，对 CGM 发射进行了一次源盲的、宽红移范围（z ∼ 0 到 5）窄带成像巡天。我们对探测到的、已分辨的发射线源进行了编目，其中包括一个 30 千帕宽的 Hα 源，它可能是 z = 0 时一个低质量星系（恒星质量 ∼ 108.78±0.42 太阳质量）的 CGM。1723，一个60千帕宽的Ly α结构与z=3.9076的一个星系有关，一个130千帕（∼rvir）宽的[O II]特征揭示了z=1.2480的一对星系之间的相互作用。低质量星系的 Hα 速度场表明，CGM 比星系盘更加混乱或湍动，而相互作用星系的 Hα 速度场则显示出大尺度（∼50 千帕）的相干运动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.