FEASTS Combined with Interferometry. I. Overall Properties of Diffuse H I and Implications for Gas Accretion in Nearby Galaxies

被引：11

作者：

Wang, Jing ^{[1
]}

Lin, Xuchen ^{[1
]}

Yang, Dong ^{[1
]}

Staveley-Smith, Lister ^{[2
,3
]}

Walter, Fabian ^{[4
]}

Wang, Q. Daniel ^{[5
]}

Wang, Ran ^{[1
]}

Battisti, A. J. ^{[3
,6
]}

Catinella, Barbara ^{[2
,3
]}

Chen, Hsiao-Wen ^{[7
]}

Cortese, Luca ^{[2
,3
]}

Fisher, D. B. ^{[3
,8
]}

Ho, Luis C. ^{[1
]}

Ji, Suoqing ^{[9
]}

Jiang, Peng ^{[10
,11
]}

Kauffmann, Guinevere ^{[12
]}

Kong, Xu ^{[12
,13
,14
]}

Liu, Ziming ^{[10
,11
]}

Shao, Li ^{[10
,11
]}

Wang, Jie ^{[10
,11
]}

Wang, Lile ^{[1
]}

Wang, Shun ^{[1
]}

机构：

[1] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[2] Univ Western Australia, Int Ctr Radio Astron Res, 35 Stirling Highway, Crawley, WA 6009, Australia

[3] ARC Ctr Excellence All Sky Astrophys Dimens ASTRO, Canberra, ACT, Australia

[4] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[5] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[6] Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Weston, ACT 2611, Australia

[7] Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 USA

[8] Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia

[9] Chinese Acad Sci, Astrophys Div, Shanghai 200030, Peoples R China

[10] Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China

[11] Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing, Peoples R China

[12] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany

[13] Univ Sci & Technol China, Dept Astron, Deep Space Explorat Lab, Hefei 230026, Peoples R China

[14] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 968卷 / 01期

基金：

澳大利亚研究理事会; 美国国家科学基金会; 国家重点研发计划;

关键词：

STAR-FORMATION; NEUTRAL HYDROGEN; COLD GAS; NGC; 4631; CIRCUMGALACTIC MEDIUM; INTERSTELLAR-MEDIUM; TIDAL INTERACTIONS; GALACTIC FOUNTAIN; SINGLE-DISH; SIMULATIONS;

D O I：

10.3847/1538-4357/ad3e61

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a statistical study of the properties of diffuse H I in 10 nearby galaxies, comparing the H I detected by the single-dish telescope FAST (FEASTS program) and the interferometer Very Large Array (THINGS program), respectively. The THINGS observation missed H I with a median of 23% due to the short-spacing problem of interferometry and limited sensitivity. We extract the diffuse H I by subtracting the dense H I, which is obtained from the THINGS data with a uniform flux-density threshold, from the total H I detected by FAST. Among the sample, the median diffuse-H I fraction is 34%, and more diffuse H I is found in galaxies exhibiting more prominent tidal-interaction signatures. The diffuse H I we detected seems to be distributed in disk-like layers within a typical thickness of 1 kpc, different from the more halo-like diffuse H I detected around NGC 4631 in a previous study. Most of the diffuse H I is cospatial with the dense H I and has a typical column density of 1017.7-1020.1 cm-2. The diffuse and dense H I exhibit a similar rotational motion, but the former lags by a median of 25% in at least the inner disks, and its velocity dispersions are typically twice as high. Based on a simplified estimation of circumgalactic medium properties and assuming pressure equilibrium, the volume density of diffuse H I appears to be constant within each individual galaxy, implying its role as a cooling interface. Comparing with existing models, these results are consistent with a possible link between tidal interactions, the formation of diffuse H I, and gas accretion.

引用

页数：39

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