H I POWER SPECTRA AND THE TURBULENT INTERSTELLAR MEDIUM OF DWARF IRREGULAR GALAXIES
文献类型：期刊论文
| 作者 | Zhang, Hong-Xin1,2,3; Hunter, Deidre A.2; Elmegreen, Bruce G.4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-07-20 |
| 卷号 | 754期号:1页码:29(14pp) |
| 关键词 | galaxies: dwarf galaxies: irregular galaxies: ISM ISM: lines and bands ISM: structure turbulence |
| ISSN号 | 0004-637X |
| 英文摘要 | H 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | LARGE-MAGELLANIC-CLOUD ; SUPERSONIC ISOTHERMAL TURBULENCE ; GALACTIC NEUTRAL HYDROGEN ; YOUNG STAR-CLUSTERS ; MAGNETOHYDRODYNAMIC TURBULENCE ; VELOCITY DISPERSION ; THERMAL INSTABILITY ; ATOMIC-HYDROGEN ; SPIRAL GALAXIES ; LARGE-SAMPLE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000306111800029 |
| 公开日期 | 2013-01-31 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/8068]  |
| 专题 | 紫金山天文台_星系中的恒星形成研究团组 |
| 作者单位 | 1.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 |
| 推荐引用方式 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). |
入库方式： OAI收割
来源：紫金山天文台
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