| タイトル | On the X-ray spectrum of the volume emissivity arising from Abell clusters |
| 著者（英） | Boldt, E. A.; Stottlemyer, A. R. |
| 著者所属（英） | NASA Goddard Space Flight Center|Computer Sciences Corp. |
| 発行日 | 1984-04-15 |
| 言語 | eng |
| 内容記述 | HEAO 1 A-2 X-ray spectra (2-15 keV) for an optically selected sample of Abell clusters of galaxies with z less than 0.1 have been analyzed to determine the energy dependence of the cosmological X-ray volume emissivity arising from such clusters. This spectrum is well fitted by an isothermal-bremsstrahlung model with kT = 7.4 + or - 1.5 KeV. This result is a test of the isothermal-volume-emissivity spectrum to be inferred from the conjecture that all contributing clusters may be characterized by kT = 7 keV, as assumed by McKee et al. (1980) in estimating the underlying luminosity function for the same sample. Although satisfied at the statistical level indicated, the analysis of a low-luminosity subsample suggests that this assumption of identical isothermal spectra would lead to a systematic error for a more statistically precise determination of the luminosity function's form. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 84A33554 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/398188 |
