宇宙紫外重子调查（CUBS）VII：论 0.4 $\lesssim$ z $\lesssim$ 0.7 处由 O VI 和 Ne VIII 探测的温热星系周介质
The Cosmic Ultraviolet Baryon Survey (CUBS) VII: on the warm-hot circumgalactic medium probed by O VI and Ne VIII at 0.4 $\lesssim$ z $\lesssim$ 0.7
Zhijie Qu, Hsiao-Wen Chen, Sean D. Johnson, Gwen C. Rudie, Fakhri S. Zahedy, David DePalma, Joop Schaye, Erin T. Boettcher, Sebastiano Cantalupo, Mandy C. Chen,… 展开作者
Zhijie Qu, Hsiao-Wen Chen, Sean D. Johnson, Gwen C. Rudie, Fakhri S. Zahedy, David DePalma, Joop Schaye, Erin T. Boettcher, Sebastiano Cantalupo, Mandy C. Chen, Claude-André Faucher-Giguère, Jennifer I-Hsiu Li, John S. Mulchaey, Patrick Petitjean, Marc Rafelski
备注：
Submitted to ApJ after addressing the referee's comments; 28 pages, 16 figures
本文提出了一个新建立的包含 103 个独立星系或星系群的样本，红移范围为 $0.4\lesssim z\lesssim 0.7$，来自宇宙紫外重子调查（CUBS），用于研究由 O VI 和 Ne VIII 吸收共同探测的温热星系周介质（CGM）。这些星系及其伴星是在距 15 个 $z_{\rm QSO}\gtrsim 0.8$ 的 CUBS 类星体视线方向 $< 1$ 物理 Mpc 处确定的。总共有 30 个星系或星系群在视向速度间隔 $\pm250$ km/s 内表现出相关的 O VI $λλ$ 1031, 1037 双线吸收，而其余的在 $\log N_{\rm OVI}/{\rm cm^{-2}}\approx13.7$ 的探测限下未显示 O VI 痕迹。同时，只有五个星系或星系群表现出 Ne VIII $λλ$ 770,780 双线吸收，其柱密度极限为 $\log N_{\rm NeVIII}/{\rm cm^{-2}}\approx14.0$。这些含有 O VI 和 Ne VIII 的晕存在于不同的星系环境中，恒星质量范围从 $\log M_{\rm star}/M_\odot \approx 8$ 到 $\approx11.5$。不同恒星质量和恒星形成率的星系周围的温热 CGM 表现出不同的空间分布和运动学特征。特别是，$\log M_{\rm star}/M_\odot\approx9-11$ 的恒星形成星系在位力半径内表现出显著集中的金属富集温热 CGM，而大质量宁静星系的柱密度和覆盖分数则表现出更平坦的径向分布。此外，对于位力半径内 $\log M_{\rm star}/M_\odot>9$ 的星系，O VI 吸收的速度弥散较宽，$σ_v > 40$ km/s，表明这些星系周围存在更具动态的温热晕。最后，基于 CGM 中的高电离分数，由 O VI 和 Ne VIII 探测的温热 CGM 被认为是 $\log M_{\rm star}/M_\odot\approx9-10$ 的亚 $L^*$ 星系中的主导相态。
英文摘要：
This paper presents a newly established sample of 103 unique galaxies or galaxy groups at $0.4\lesssim z\lesssim 0.7$ from the Cosmic Ultraviolet Baryon Survey (CUBS) for studying the warm-hot circumgalactic medium (CGM) probed by both O VI and Ne VIII absorption. The galaxies and associated neighbors are identified at $< 1$ physical Mpc from the sightlines toward 15 CUBS QSOs at $z_{\rm QSO}\gtrsim 0.8$. A total of 30 galaxies or galaxy groups exhibit associated O VI $λλ$ 1031, 1037 doublet absorption within a line-of-sight velocity interval of $\pm250$ km/s, while the rest show no trace of O VI to a detection limit of $\log N_{\rm OVI}/{\rm cm^{-2}}\approx13.7$. Meanwhile, only five galaxies or galaxy groups exhibit the Ne VIII $λλ$ 770,780 doublet absorption, down to a limiting column density of $\log N_{\rm NeVIII}/{\rm cm^{-2}}\approx14.0$. These O VI- and Ne VIII-bearing halos reside in different galaxy environments with stellar masses ranging from $\log M_{\rm star}/M_\odot \approx 8$ to $\approx11.5$. The warm-hot CGM around galaxies of different stellar masses and star formation rates exhibits different spatial profiles and kinematics. In particular, star-forming galaxies with $\log M_{\rm star}/M_\odot\approx9-11$ show a significant concentration of metal-enriched warm-hot CGM within the virial radius, while massive quiescent galaxies exhibit flatter radial profiles of both column densities and covering fractions. In addition, the velocity dispersion of O VI absorption is broad with $σ_v > 40$ km/s for galaxies of $\log M_{\rm star}/M_\odot>9$ within the virial radius, suggesting a more dynamic warm-hot halo around these galaxies. Finally, the warm-hot CGM probed by O VI and Ne VIII is suggested to be the dominant phase in sub-$L^*$ galaxies with $\log M_{\rm star}/M_\odot\approx9-10$ based on their high ionization fractions in the CGM.
Nonlinear Color-Metallicity Relations of Globular Clusters. VIII. Reproducing Color Distributions of Individual Globular Cluster Systems in the Virgo and Fornax Galaxy Clusters
ExoMol line lists VIII: A variationally computed line list for hot formaldehyde
本文给出了甲醛H $_2{}^{12}$ C $^{16}$ O适用于温度高达$T=1500$ ~K的计算线表。用经验势能和{ \it ab initio}偶极矩面作为核运动程序TROVE的输入。由此产生的线列表，称为\textit{AYTY}，包含1030万个旋转振动状态和大约100亿个跃迁频率。对于波数低于10~000 cm \(^{-1}\)和转动激发高达\(J=70\)的情况，每个跃迁包括相关的Einstein- $A$系数和绝对跃迁强度.室温光谱与实验室的测量和目前在HITRAN数据库中的数据进行了比较。这些光谱与实验光谱非常吻合，突出了HITRAN数据的差距和局限性。完整的行列表可从CDS数据库以及\url{www.exomol.com}获得。
