利用HI吸收与发射探测星际介质：针对W3 HII区
摘要
presented towards the W3 HII complex are used to probe the Galactic structure and interstellar medium conditions between us and this region. The overall shape of the spectra is consistent with the predictions of the Two-Arm Spiral Shock model wherein the gas found in the -40 km/s to -50 km/s range has been accelerated by some 20 km/s from its rotation curve velocity. Spin temperatures of ~100 K are derived for the Local Arm gas, lower than found in a previous, similar study towards DR 7. For the interarm region, values on the order of 300 K are found, implying a negligible filling factor for the Cold Neutral Medium (<< 1%). Some of the absorbing gas at velocities near -40 km/s is confirmed to be associated with the HII regions.
引用
@article{arxiv.astro-ph/9901421,
title = {Probing the Interstellar Medium using HI absorption and emission towards the W3 HII region},
author = {Magdalen Normandeau},
journal= {arXiv preprint arXiv:astro-ph/9901421},
year = {2009}
}
备注
23 pages, 6 figures, accepted for publication in the Astronomical Journal