Turbulent power spectrum in warm and cold neutral medium using the Galactic H i21 cm emission
نویسندگان
چکیده
منابع مشابه
Power spectrum of the polarized diffuse Galactic radio emission
We have analyzed the available polarization surveys of the Galactic emission to estimate to what extent it may be a serious hindrance to forthcoming experiments aimed at detecting the polarized component of Cosmic Microwave Background (CMB) anisotropies. Regions were identified for which independent data consistently indicate that depolarization must be small. The power spectrum of the polarize...
متن کاملThe Turbulent Warm Ionized Medium: Emission Measure Distribution and Mhd Simulations
We present an analysis of the distribution of Hα emission measures for the warm ionized medium (WIM) of the Galaxy using data from the Wisconsin H-Alpha Mapper (WHAM) Northern Sky Survey. Our sample is restricted to Galactic latitudes |b| > 10. We removed sightlines intersecting nineteen high-latititude classical H II regions, leaving only sightlines that sample the diffuse WIM. The distributio...
متن کاملDetection of HI 21 cm - line absorption in the Warm Neutral Medium and in the Outer Arm of the Galaxy
Using the Westerbork Synthesis Radio Telescope, we have detected HI 21 cm-line absorption in the Warm Neutral Medium of the Galaxy toward the ex-tragalactic source 3C147. This absorption, at an LSR velocity of –29±4 km s −1 with a full width at half maximum of 53±6 km s −1 , is associated with the Perseus Arm of the Galaxy. The observed optical depth is (1.9±0.2)×10 −3. The estimated spin tempe...
متن کاملThe Millennium Arecibo 21-cm Absorption Line Survey. Ii. Properties of the Warm and Cold Neutral Media
We use the Gaussian-fit results of Paper I to investigate the properties of interstellar HI in the Solar neighborhood. The Warm and Cold Neutral Media (WNM and CNM) are physically distinct components. The CNM spin temperature histogram peaks at about 40 K; its median, weighted by column density, is 70 K. About 60% of all HI is WNM; there is no discernable change in this fraction at z = 0. At z ...
متن کاملSupersonic Turbulent Flows and the Fragmentation of a Cold Medium
The role played by velocity elds in the fragmentation of a cold medium and in the formation of protostars is studied. The velocity eld is modeled with a compressible turbulent ow. A supersonic turbulent velocity eld can fragment the medium into clumps of mass smaller than a local Jeans' mass, and therefore stabilize the medium against the formation of protostars. Based on this idea, the protost...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2018
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/sty3342