نتایج جستجو برای: ism structure
تعداد نتایج: 1573583 فیلتر نتایج به سال:
We present an analysis of far–infrared (FIR) [CII] and [OI] fine structure line and continuum observations obtained with Herschel/PACS, and 12CO(1–0) observations obtained with the IRAM Plateau de Bure Interferometer, of Lyman-break analogs (LBAs) at z ∼ 0.2. The principal aim of this work is to determine the typical interstellar medium (ISM) properties of z ∼ 1−2 main sequence (MS) galaxies, w...
We study three quasar radio sources (B1257-326, B1519-273, and J1819+385) that show large amplitude intraday and annual scintillation variability produced by the Earth’s motion relative to turbulent-scattering screens located within a few parsecs of the Sun. We find that the lines of sight to these sources pass through the edges of partially ionized warm interstellar clouds where two or more cl...
We present an empirical dynamical model of the local interstellar medium based on 270 radial-velocity measurements for 157 sight lines toward nearby stars. Physical-parameter measurements (i.e., temperature, turbulent velocity, depletions) are available for 90 components, or one-third of the sample, enabling initial characterizations of the physical properties of LISM clouds. The model includes...
The Southern Galactic Plane Survey (SGPS) is a project to image the H i line emission and 1.4 GHz continuum in the fourth quadrant of the Milky Way at high resolution using the Australia Telescope Compact Array (ATCA) and the Parkes Radio Telescope. In this paper we describe the survey details and goals, present λ21-cm continuum data, and discuss H i absorption and emission characteristics of t...
We mapped a 13×22 pc region in emission from 492 GHz [C I] and, for the first time, 551 GHz 13CO(5→4) in the giant molecular cloud M17SW. The morphologies of the [C I] and 13CO emission are strikingly similar. The extent and intensity of the [C I] and 13CO(5→4) emission is explained as arising from photodissociation regions on the surfaces of embedded molecular clumps. Modeling of the 13CO(5→4)...
سازمان های قانون گذار صنعت دریانوردی، سالهای زیادی سعی خویش را در جهت بهبود این صنعت، از طریق ارائه استانداردهای فنی، کاربرد تکنولوژی های جدید و تصویب قوانین بین المللی مرتبط با این استانداردها و تکنولوژی ها صرف نمودند. بررسی سوانح دریایی نشان داد که عامل انسانی سهم عمده ای از دلایل وقوع حوادث ناگوار دریایی می باشد. imo از سال 1998 در راستای پیشگیری از خطای انسانی در کشتی های کنوانسیونی، استقرا...
We present starburst models for far-infrared/sub-millimeter/millimeter (FIR/sub-mm/mm) line emission of molecular and atomic gas in an evolving starburst region, which is treated as an ensemble of non-interacting hot bubbles which drive spherical shells of swept-up gas into a surrounding uniform gas medium. These bubbles and shells are driven by stellar winds and supernovae within massive star ...
We present new high resolution (100) neutral hydrogen (H i) self-absorption images of the Riegel-Crutcher cloud obtained with the Australia Telescope Compact Array and the Parkes Radio Telescope. The Riegel-Crutcher cloud lies in the direction of the Galactic center at a distance of 125±25 pc. Our observations resolve the very large, nearby sheet of cold hydrogen into a spectacular network of d...
Item hierarchy and concept tree provide references for cognition diagnosis and remedial instruction. Therefore, integration of data analysis on item hierarchy and concept tree should be important. The purpose of this study is to provide an integrated methodology of item hierarchy and concept tree analysis. Besides, fuzzy clustering is adopted to classify sample so that homogeneity appear in the...
We present 50 individual measurements of the gas temperature and turbulent velocity in the local interstellar medium (LISM) within 100 pc. By comparing the absorption line widths of many ions with different atomic masses, we can satisfactorily discriminate between the two dominant broadening mechanisms, thermal broadening and macroscopic nonthermal, or turbulent, broadening. We find that the su...
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