Evidence for a Massive Warm?Hot Circumgalactic Medium around NGC 3221

被引：22

作者：

Das, Sanskriti ^{[1
]}

Mathur, Smita ^{[1
,2
]}

Gupta, Anjali ^{[1
,3
]}

Nicastro, Fabrizio ^{[4
,5
]}

Krongold, Yair ^{[6
]}

Null, Cody ^{[3
]}

机构：

[1] Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA

[2] Ctr Cosmol & Astroparticle Phys, 191 West Woodruff Ave, Columbus, OH 43210 USA

[3] Columbus State Community Coll, 550 E Spring St, Columbus, OH 43210 USA

[4] Observ Astron Roma INAF, Via Frascati 33, I-00040 Monte Porzio Catone, RM, Italy

[5] Harvard Smithsonian Ctr Astrophys, 60 Garden St,MS-04, Cambridge, MA 02138 USA

[6] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 885卷 / 02期

基金：

美国国家航空航天局;

关键词：

X-RAY; GASEOUS HALO; XMM-NEWTON; H-ALPHA; HOT GAS; GALAXIES; EMISSION; CLUSTERS; SPECTRA; CATALOG;

D O I：

10.3847/1538-4357/ab48df

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report a 3.4? detection of the warm?hot, massive, extended circumgalactic medium (CGM) around an L-? star-forming spiral galaxy NGC 3221, using deep Suzaku observations. The temperature of the gas is 10(6.1) K, comparable to that of the Milky Way CGM. The spatial extent of the gas is at least 150 kpc. For a ?-model of density profile with solar abundance, the central emission measure is EM;=;(3;;1);;10(?5) cm(?6) kpc and the central electron density is n(eo);=;(4;;1);;10(?4) cm(?3), with a slope of ?;=;0.56. We investigate a range of ? values and find that the details of the density profile do not change our results significantly. The mass of the warm?hot gas, assuming a metallicity of Z<sub, is (16;;3);;10(10) M, which is the most massive baryon component of NGC 3221. The baryon fraction is f(b);=;0.120;;0.036 (statistical) <i (systematic), consistent with the cosmological mean value, closing the baryon budget of this galaxy. We also investigated the missing metals problem in conjunction with the missing baryons problem and conclude that metals are likely to be preferentially expelled from the galaxy. Ours is the first detection of an extended warm?hot CGM around an external L-? star-forming spiral galaxy, where the CGM likely accounts for the missing galactic baryons.

引用

页数：13

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