Probing the hot circumgalactic medium of external galaxies in X-ray absorption II: a luminous spiral galaxy at z ≈ 0.225

被引：7

作者：

Mathur, Smita ^{[1
,2
]}

Das, Sanskriti ^{[3
]}

Gupta, Anjali ^{[4
]}

Krongold, Yair ^{[5
]}

机构：

[1] Ohio State Univ, Astron Dept, Columbus, OH 43210 USA

[2] Ohio State Univ, Ctr Cosmol & Astro Particle Phys, Columbus, OH 43210 USA

[3] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, 452 Lomita Mall, Stanford, CA 94305 USA

[4] Columbus State Community Coll, Columbus, OH 43215 USA

[5] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, Mexico

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 525卷 / 01期

基金：

美国国家航空航天局;

关键词：

galaxies: evolution; galaxies: formation; galaxies: haloes; quasars: absorption lines; X-rays: galaxies; XMM-NEWTON OBSERVATIONS; O VI; INTERGALACTIC MEDIUM; LOW-REDSHIFT; CHEMICAL-COMPOSITION; SIGHT-LINES; WARM-HOT; MILKY; HALO; GAS;

D O I：

10.1093/mnrasl/slad085

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The circumgalactic medium (CGM) is the most massive baryonic component of a spiral galaxy, shock heated to about 10(6) K for an L-star galaxy. The CGM of the Milky Way has been well-characterized through X-ray absorption line spectroscopy. However, the paucity of bright background sources makes it challenging to probe the CGM of external galaxies. Previously, using broad O VI absorption as a signpost, we successfully detected the CGM of one galaxy in X-rays. Here we report on the detection of the O VII K alpha absorption line at the redshift of a spiral galaxy at z approximate to 0.225, using 1.2 Ms of Chandra observations. This is a robust detection, clearly showing the presence of the hot gas. The mass in the hot phase is at least an order of magnitude larger than that in the cooler phases detected in the UV. The presence of hot gas 116 h(-1) kpc from the centre of this galaxy provides credence to the existence of the extended CGM of the Milky Way. There has been a report of the detection of O VII absorption from the warm-hot intergalactic medium in this sightline, using stacking analysis on older data set. We argue that the absorption line is from the CGM of the z approximate to 0.225 galaxy instead.

引用

页码：L11 / L16

页数：6

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