Metallicity Mapping of the Ionized Diffuse Gas at the Milky Way Disk-Halo Interface

被引:0
|
作者
Choi, Bo-Eun [1 ]
Werk, Jessica K. [1 ]
Tchernyshyov, Kirill [1 ]
Prochaska, J. Xavier [2 ,3 ,4 ]
Zheng, Yong [5 ]
Putman, Mary E. [6 ]
Fielding, Drummond B. [7 ,8 ]
Strader, Jay [9 ]
机构
[1] UNIV WASHINGTON, Dept Astron, Seattle, WA 98195 USA
[2] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
[3] Kavli Inst Phys & Math Universe Kavli IPMU, 5-1-5 Kashiwanoha, Kashiwa 2778583, Japan
[4] Natl Astron Observ Japan, Div Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[5] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA
[6] Columbia Univ, Dept Astron, New York, NY 10027 USA
[7] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
[8] Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA
[9] Michigan State Univ, Ctr Data Intens & Time Domain Astron, Dept Phys & Astron, E Lansing, MI 48824 USA
来源
ASTROPHYSICAL JOURNAL | 2024年 / 976卷 / 02期
基金
美国国家科学基金会;
关键词
HIGH-VELOCITY CLOUDS; GLOBULAR-CLUSTER M13; MILLISECOND PULSAR; GALACTIC HALO; RAY BUBBLES; COMPLEX-C; STAR; MODEL; WARM; MASS;
D O I
10.3847/1538-4357/ad84f8
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Metals in the diffuse, ionized gas at the boundary between the Milky Way's interstellar medium (ISM) and circumgalactic medium, known as the disk-halo interface (DHI), are valuable tracers of the feedback processes that drive the Galactic fountain. However, metallicity measurements in this region are challenging due to obscuration by the Milky Way ISM and uncertain ionization corrections that affect the total hydrogen column density. In this work, we constrain ionization corrections to neutral hydrogen column densities using precisely measured electron column densities from the dispersion measures of pulsars that lie in the same globular clusters as UV-bright targets with high-resolution absorption spectroscopy. We address the blending of absorption lines with the ISM by jointly fitting Voigt profiles to all absorption components. We present our metallicity estimates for the DHI of the Milky Way based on detailed photoionization modeling of the absorption from ionized metal lines and ionization-corrected total hydrogen columns. Generally, the gas clouds show a large scatter in metallicity, ranging between 0.04 and 3.2 Z(circle dot), implying that the DHI consists of a mixture of gaseous structures having multiple origins. We estimate the inflow and outflow timescales of the DHI ionized clouds to be 6-35 Myr. We report the detection of an infalling cloud with supersolar metallicity that suggests a Galactic fountain mechanism, whereas at least one low-metallicity outflowing cloud (Z < 0.1 Z(circle dot)) poses a challenge for Galactic fountain and feedback models.
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页数:22
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