The CIViL* Survey: The Discovery of a C iv Dichotomy in the Circumgalactic Medium of L* Galaxies

The Astrophysical Journal Letters Pub Date : 2024-12-27 DOI:10.3847/2041-8213/ad9c69

Samantha L. Garza, Jessica K. Werk, Trystyn A. M. Berg, Yakov Faerman, Benjamin D. Oppenheimer, Rongmon Bordoloi and Sara L. Ellison

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Abstract

This paper investigates C iv absorption in the circumgalactic medium (CGM) of L⋆ galaxies and its relationship with galaxy star formation rates. We present new observations from the C iv in L⋆ galaxies survey (PID#17076) using the Hubble Space Telescope/Cosmic Origins Spectrograph. By combining these measurements with archival C iv data (46 observations total), we estimate detection fractions for star-forming (sSFR > 10−11 yr−1) and passive galaxies (sSFR ≤ 10−11 yr−1 ) to be 72 % [21/29] and 23 % [3/13], respectively. This indicates a significant dichotomy in C iv presence between L⋆ star-forming and passive galaxies, with over 99% confidence. This finding aligns with J. Tumlinson et al., which noted a similar dichotomy in O vi absorption. Our results imply a substantial carbon reservoir in the CGM of L⋆ galaxies, suggesting a minimum carbon mass of ≳3.03 × 106M⊙ out to 120 kpc. Together, these findings highlight a strong connection between star formation in galaxies and the state of their CGM, providing insight into the mechanisms governing galaxy evolution.

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CIViL*巡天：L*星系环星系介质中C iv二分法的发现

本文研究了L - n星系环星系介质（CGM）中的c4吸收及其与星系恒星形成速率的关系。我们展示了使用哈勃太空望远镜/宇宙起源光谱仪在L -百科星系调查（PID#17076）中的C iv的新观测结果。通过将这些测量结果与存档的C iv数据（共46次观测）相结合，我们估计恒星形成（sSFR≤10−11 yr−1）和被动星系（sSFR≤10−11 yr−1）的探测分数分别为72%[21/29]和23%[3/13]。这表明在C iv中，L -百科恒星形成星系和被动星系之间存在着明显的二分法，置信度超过99%。这一发现与J. Tumlinson等人的发现一致，他们注意到在O - vi吸收中存在类似的二分法。我们的结果表明，在L -百科星系的CGM中存在大量的碳储层，表明最小碳质量为≤3.03 × 106M⊙至120kpc。总之，这些发现强调了星系中恒星形成与其CGM状态之间的紧密联系，为星系演化的机制提供了见解。

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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The Astrophysical Journal Letters

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