| タイトル | First images of water vapor masers in the galaxy M33 |
| 著者（英） | Gwinn, C. R.; Greenhill, L. J.; Menten, K. M.; Reid, M. J.; Moran, J. M. |
| 著者所属（英） | Harvard-Smithsonian Center for Astrophysics |
| 発行日 | 1990-12-01 |
| 言語 | eng |
| 内容記述 | The first successful VLBI observations of 10 extragalactic H2O masers in the M33 galaxy are reported. A spectral-line VLBI synthesis map is constructed, the first of any extragalactic H2O maser sources. The map has the lowest noise of any K-band spectral line VLBI map yet produced. The maser emission extends over about 300 milliarcseconds and is divided into 14 distinct spatial components, the strongest of which has a correlated flux density of about 0.7 Jy. The relative positions of some of these components are determined accurately enough to provide first-epoch measurements for proper motion studies. The characteristics of the maser are similar to those of the most powerful maser in the Galaxy, W49N. A compact H II region is found close to the maser which is 1 pc in diameter and whose emission measure is about 6 x 10 to the 7th pc/cm exp 6. This region is the compact component of a more extended H II complex that extends over about 100 pc. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 91A16516 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/351550 |
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