学术
Are Type Ia Supernovae Reliable Distance Indicators？
Lian-Zhong Lü[1,2,4] Yi-Ping Qin[2,3] Fu-Wen Zhang[1,4]
[1]National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 [2]Physics Department, Guangxi University, Nanning 530004 [3]Center for Astrophysics of Guangzhou University, Guangzhou 510006 [4]Graduate School of Chinese Academy of Sciences, Beijing 100049
文章出处:
《中国天文和天体物理学报：英文版》-2007年7卷5期 -649-656页
分 类 号:
Are Type Ia Supernovae Reliable Distance Indicators？
Abstract:
Recent applications of type Ia supernovae （SNe Ia） in cosmology have successfully revealed the accelerating expansion of the universe. However, as distance indicators used in measuring the expansion history of the universe and probing the nature of dark energy, these objects must pass more strict tests. We propose a K-S test to investigate if there exists any systematic bias when deriving the luminosity distances under the standard candle assumption. Two samples, one comprising 71 high-redshift SNe Ia and the other, 44 nearby ones, are used in our investigation. We find that it is likely there exists a bias in the adopted samples, which is probably caused by a systematic error, e.g. in the color parameter used in the luminosity calibration and a bias may be caused by the SN evolution or by varying properties of the dust surrounding the SNe Ia.[著者文摘]
Key words:
cosmology; observations -- distance scale -- galaxies; distances and redshifts -- methods; statistical -- supernovae; general
基金资助:
Supported by the National Natural Science Foundation of China. Acknowledgements We thank the referee for a number of critical comments and suggestions that helped us to improve the paper. We would like to thank A. C. Gupta for carefully reading the manuscript. This work was supported by the Special Funds for Major State Basic Research Projects （＂973＂）, the National Natural Science Foundation of China （NSFC, Nos. 10273019, 10463002 and 10463001）, ＂Hundred Talents Program of CAS＂, Grant for Distinguished Young Scientists from the NSFC （No. 10425314）, and from Yunnan Province （Grant 2004PY01）.
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