| タイトル | Quasar ionization of Lyman-alpha clouds - The proximity effect, a probe of the ultraviolet background at high redshift |
| 著者（英） | Duncan, Robert C.; Ostriker, Jeremiah P.; Bajtlik, Stanislaw |
| 著者所属（英） | Princeton Univ. Observatory |
| 発行日 | 1988-04-15 |
| 言語 | eng |
| 内容記述 | The distribution of lines in the Ly-alpha forests in quasar spectra is examined using spectral data from 19 quasars with emission lines redshifts z sub Q ranging from 1.7 to 3.8. The number density of Ly-alpha lines generally increases with resdhift z, but there exists a countervailing trend of diminishing number density within individual quasar spectra as z tends to z sub Q. Evidence is presented that this countervailing trend is due to enhanced ionization of Ly-alpha clouds by the bright nearby quasars in whose spectra they are observed. It is suggested that this proximity effect should be used as a powerful tool to measure locally the ionizing flux emitted by high-redshift objects. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 88A31130 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/371730 |
