首页> 外文OA文献 >Gravitational Magnification of Pop III Supernovae in Hierarchical Cosmological Models: NGST Perspectives
【2h】

Gravitational Magnification of Pop III Supernovae in Hierarchical Cosmological Models: NGST Perspectives

机译:层次分析中pop III超新星的引力放大  宇宙学模型:NGsT观点

摘要

We study the gravitational lensing magnification produced by the interveningcosmological matter distribution, as deduced from three different hierarchicalmodels (SCDM, LCDM, CHDM) on very high redshift sources, particularlysupernovae in protogalactic (Pop III) objects. By means of ray-shootingnumerical simulations we find that caustics are more intense and concentratedin SCDM models. The magnification probability function presents a moderatedegree of evolution up to $zpprox 5$ (CHDM) and $zpprox 7$ (SCDM/LCDM). Allmodels predict that statistically large magnifications, $mu simgt 20$ areachievable, with a probability of the order of a fraction of percent, the SCDMmodel being the most efficient magnifier. All cosmologies predict that above$zpprox 4$ there is a 10% chance to get magnifications larger than 3. We haveexplored the observational perspectives for Pop III SNe detection with NGSTwhen gravitational magnification is taken into account. We find that NGSTshould be able to detect and confirm spectroscopically Type II SNe up to aredshift of $z pprox 4$ in the J band (for $T_{SN}=25000$ K); this limitcould be increased up to $zpprox 9$ in the K band, allowing for a relativelymoderate magnification. Possibly promising strategies to discriminate amongcosmological models using their GL magnification predictions and very high-$z$SNe are sketched. Finally, we outline and discuss the limitations of our study.
机译:我们研究了由干涉宇宙学物质分布产生的引力透镜放大倍率,这是根据在非常高的红移源(尤其是原银河系中的超新星)(Pop III)上的三种不同的层次模型(SCDM,LCDM,CHDM)推导出来的。通过射线射击数值模拟,我们发现苛性碱在SCDM模型中更为强烈和集中。放大率函数呈现中等程度的演化,最高可达$ z 大约5 $(CHDM)和$ z 大约7 $(SCDM / LCDM)。所有模型都预测可以达到统计上的大放大倍率,即 mu simgt 20 $,其概率为百分之几的数量级,SCDM模型是最有效的放大镜。所有宇宙学都预测,z大于4美元时,有10%的机会获得大于3的放大倍率。在考虑了引力放大倍数的情况下,我们已经探索了用NGST探测Pop III SNe的观察角度。我们发现,NGST应该能够在光谱上检测和确认II型SNe直到J波段$ z 约4 $的位移(对于$ T_ {SN} = 25000 $ K);这个限制可以在K波段增加到$ z 约9 $,允许相对中等的放大倍率。勾勒出了可能很有希望的策略,即使用其GL放大率预测和非常高的$ z $ SNe来区分宇宙学模型。最后,我们概述并讨论了研究的局限性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号