DENSITY PDFS OF DIFFUSE GAS IN THE MILKY WAY

被引:3
作者
Berkhuijsen, E. M. [1 ]
Fletcher, A. [2 ]
机构
[1] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[2] Newcastle Univ, Sch Math & Stat, Newcastle, NSW NE1 7RU, Australia
来源
ROLE OF THE DISK-HALO INTERACTION IN GALAXY EVOLUTION: OUTFLOWS VS INFALL? | 2012年 / 56卷
关键词
WARM IONIZED MEDIUM; INTERSTELLAR-MEDIUM; IUE SURVEY; SIMULATIONS; ABSORPTION;
D O I
10.1051/eas/1256039
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The probability distribution functions (PDFs) of the average densities of the diffuse ionized gas (DIG) and the diffuse atomic gas are close to lognormal, especially when lines of sight at vertical bar b vertical bar < 5 degrees and vertical bar b vertical bar >= 5 degrees are considered separately. Our results provide strong support for the existence of a lognormal density PDF in the diffuse ISM, consistent with a turbulent origin of density structure in the diffuse gas.
引用
收藏
页码:243 / +
页数:2
相关论文
共 10 条
[1]   Global dynamical evolution of the ISM in star forming galaxies - I. High resolution 3D simulations: Effect of the magnetic field [J].
de Avillez, MA ;
Breitschwerdt, D .
ASTRONOMY & ASTROPHYSICS, 2005, 436 (02) :585-600
[2]   AN IUE SURVEY OF INTERSTELLAR H-I LY-ALPHA ABSORPTION .2. INTERPRETATIONS [J].
DIPLAS, A ;
SAVAGE, BD .
ASTROPHYSICAL JOURNAL, 1994, 427 (01) :274-287
[3]   AN IUE SURVEY OF INTERSTELLAR H-I LY(ALPHA) ABSORPTION .1. COLUMN DENSITIES [J].
DIPLAS, A ;
SAVAGE, BD .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1994, 93 (01) :211-228
[4]   Interstellar turbulence I: Observations and processes [J].
Elmegreen, BG ;
Scalo, J .
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 2004, 42 :211-273
[5]   THE DISTRIBUTION OF INTERSTELLAR DUST IN THE SOLAR NEIGHBORHOOD [J].
GAUSTAD, JE ;
VANBUREN, D .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1993, 105 (692) :1127-1140
[6]   The turbulent warm ionized medium: Emission measure distribution and MHD simulations [J].
Hill, Alex S. ;
Benjamin, Robert A. ;
Kowal, Grzegorz ;
Reynolds, Ronald J. ;
Haffner, L. Matthew ;
Lazarian, Alex .
ASTROPHYSICAL JOURNAL, 2008, 686 (01) :363-378
[7]  
Hill AS, 2007, ASTR SOC P, V365, P250
[8]   The probability distribution function of column density in molecular clouds [J].
Vázquez-Semadeni, E ;
García, N .
ASTROPHYSICAL JOURNAL, 2001, 557 (02) :727-735
[9]   Formation of cavities, filaments, and clumps by the nonlinear development of thermal and gravitational instabilities in the interstellar medium under stellar feedback [J].
Wada, K ;
Spaans, M ;
Kim, S .
ASTROPHYSICAL JOURNAL, 2000, 540 (02) :797-807
[10]   Density structure of the interstellar medium and the star formation rate in galactic disks [J].
Wada, Keiichi ;
Norman, Colin A. .
ASTROPHYSICAL JOURNAL, 2007, 660 (01) :276-287