摘要
对Ia超新星在宇宙学中的应用作了述评．蓝Ia超新星具有相对均匀的光谱、光变曲线及峰值光度，是较好的相对距离指示器．利用峰值光度同光变曲线形状或其它与距离无关的可观测量的关系可进一步将Ia超新星校准成精确的距离指示器。一旦它们的绝对光度得到标定，就可以定出哈勃常数H0。基于对邻近星系Ia超新星的理解，高红移Ia超新星的数据可对宇宙密度参数ΩM、ΩA及减速因子q0作出限制，并对膨胀宇宙的最终命运作出判定。
The application of Type Ia supernovae to cosmology has been briefiy reviewed. Blue SNe Ia are better distance indicators, with relatively uniform spectra, light curves, and peak luminosity.The dispersion of SN Ia's peak luminosity could be further reduced via an empirical correlation of the peak luminosity with the light curve shapes. Once the absolute luminosity of SNe Ia is determined, we can get the value of the Hubble parameter. The data of high-redshift SNe Ia could make constraints on the cosmic density parameters ΩM, ΩA as well as the deceleration factor qo, and hence determining the ultimate fate of our universe.
出处
《天文学进展》
CSCD
北大核心
2000年第2期159-171,共13页
Progress In Astronomy
基金
国家自然科学基金!19733002
