PMO OpenIR  > 星系中的恒星形成研究团组
H I POWER SPECTRA AND THE TURBULENT INTERSTELLAR MEDIUM OF DWARF IRREGULAR GALAXIES
Zhang, Hong-Xin1,2,3; Hunter, Deidre A.2; Elmegreen, Bruce G.4
2012-07-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume754Issue:1Pages:29(14pp)
AbstractH I spatial power spectra were determined for a sample of 24 nearby dwarf irregular galaxies selected from the Local Irregulars That Trace Luminosity Extremes-The H I Nearby Galaxy Survey sample. The two-dimensional power spectral indices asymptotically become a constant for each galaxy when a significant part of the line profile is integrated. For narrow channel maps, the power spectra become shallower as the channel width decreases, and this shallowing trend continues to our single channel maps. This implies that even the highest velocity resolution of 1.8 kms(-1) is not smaller than the thermal dispersion of the coolest, widespread H I component. The one-dimensional power spectra of azimuthal profiles at different radii suggest that the shallower power spectra for narrower channel width is mainly contributed by the inner disks, which indicates that the inner disks have proportionally more cooler H I than the outer disks. Galaxies with lower luminosity (M-B > -14.5 mag) and star formation rate (SFR, log(SFR (M-circle dot yr(-1))) < -2.1) tend to have steeper power spectra, which implies that the H I line-of-sight depths can be comparable with the radial length scales in low-mass galaxies. A lack of a correlation between the inertial-range spectral indices and SFR surface density implies that either non-stellar power sources are playing a fundamental role in driving the interstellar medium turbulent structure or the nonlinear development of turbulent structures has little to do with the driving sources.
KeywordGalaxies: Dwarf Galaxies: Irregular Galaxies: Ism Ism: Lines And bAnds Ism: Structure Turbulence
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/754/1/29
WOS KeywordLARGE-MAGELLANIC-CLOUD ; SUPERSONIC ISOTHERMAL TURBULENCE ; GALACTIC NEUTRAL HYDROGEN ; YOUNG STAR-CLUSTERS ; MAGNETOHYDRODYNAMIC TURBULENCE ; VELOCITY DISPERSION ; THERMAL INSTABILITY ; ATOMIC-HYDROGEN ; SPIRAL GALAXIES ; LARGE-SAMPLE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000306111800029
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8068
Collection星系中的恒星形成研究团组
Affiliation1.Chinese Acad Sci, Key Lab Radio Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Lowell Observ, Flagstaff, AZ 86001 USA
3.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China
4.IBM TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA
Recommended Citation
GB/T 7714
Zhang, Hong-Xin,Hunter, Deidre A.,Elmegreen, Bruce G.. H I POWER SPECTRA AND THE TURBULENT INTERSTELLAR MEDIUM OF DWARF IRREGULAR GALAXIES[J]. ASTROPHYSICAL JOURNAL,2012,754(1):29(14pp).
APA Zhang, Hong-Xin,Hunter, Deidre A.,&Elmegreen, Bruce G..(2012).H I POWER SPECTRA AND THE TURBULENT INTERSTELLAR MEDIUM OF DWARF IRREGULAR GALAXIES.ASTROPHYSICAL JOURNAL,754(1),29(14pp).
MLA Zhang, Hong-Xin,et al."H I POWER SPECTRA AND THE TURBULENT INTERSTELLAR MEDIUM OF DWARF IRREGULAR GALAXIES".ASTROPHYSICAL JOURNAL 754.1(2012):29(14pp).
Files in This Item:
File Name/Size DocType Version Access License
2012029H I POWER SPE(1847KB) 开放获取LicenseView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhang, Hong-Xin]'s Articles
[Hunter, Deidre A.]'s Articles
[Elmegreen, Bruce G.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhang, Hong-Xin]'s Articles
[Hunter, Deidre A.]'s Articles
[Elmegreen, Bruce G.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhang, Hong-Xin]'s Articles
[Hunter, Deidre A.]'s Articles
[Elmegreen, Bruce G.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2012029H I POWER SPECTRA AND THE TURBULENT INTERSTELLAR MEDIUM OF DWARF IRREGULAR GALAXIES.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.