期刊論文
| 學年 | 86 |
|---|---|
| 學期 | 1 |
| 出版（發表）日期 | 1998-01-01 |
| 作品名稱 | Dense gas in nearby galaxies : XI. Interstellar 12C/13C ratios in the central regions of M 82 and IC 342 |
| 作品名稱（其他語言） | |
| 著者 | Chin, Y.N.; Henkel, C.; Mauersberger, R.; Whiteoak, J.B. |
| 單位 | 淡江大學物理學系 |
| 出版者 | Les Ulis: EDP Sciences |
| 著錄名稱、卷期、頁數 | Astronomy and Astrophysics 329, pp.443-450 |
| 摘要 | (12) C / (13) C line intensity ratios have been derived from several carbon-bearing molecules to confine the range of carbon and oxygen isotope abundance ratios toward the nuclear regions of two infrared bright galaxies. The most stringent limits are obtained from CN mm-wave emission lines. Supplementary measurements toward the Galactic center region indicate that overall I(twCN)/I(thCN) line intensity ratios are giving lower limits to the corresponding ISOC abundance ratio. Toward M82 and IC342, we find ISOC > 40 and > 30. Therefore the smaller ISOC ratio of our own Galactic center region (25) may not be typical for central regions of galaxies which are more luminous in the infrared. The ISOC limits and data from various isotopic species of CO also infer ISOA abundance ratios of > 90 and > 125 for M82 and IC342, respectively. From the I(HCfoN) / I(HCfiN) line intensity ratio, ISON > 100 is derived for M82. Based on observations with the IRAM 30-m telescope, Pico Veleta, Spain and the Swedish-ESO Submillimetre Telescope (SEST) at the European Southern Observatory (ESO), La Silla, Chile |
| 關鍵字 | : ISM: abundances – Galaxies: abundances – Radio lines: ISM – Radio lines: galaxies |
| 語言 | en |
| ISSN | 0004-6361 1432-0746 |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | |
| 國別 | FRA |
| 公開徵稿 | |
| 出版型式 | 紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/72734 ) |