| Are Type Ia Supernovae Reliable Distance Indicators？ |
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| 引用本文： | Lian-Zhong Lü.Are Type Ia Supernovae Reliable Distance Indicators？[J].中国天文和天体物理学报,2007,7(5):649-656. |
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| 作者姓名： | Lian-Zhong Lü |
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| 作者单位： | [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 |
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| 摘 要： | 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.
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| 关 键 词： | cosmology observations—distance scale—galaxies distances and redshifts—methods statistical—supernovae general |
| 修稿时间： | 2006-12-01 |
Are Type la Supernovae Reliable Distance Indicators? |
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| Yi-Ping Qin,Fu-Wen Zhang.Are Type la Supernovae Reliable Distance Indicators?[J].Chinese Journal of Astronomy and Astrophysics,2007,7(5):649-656. |
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| Authors: | Yi-Ping Qin Fu-Wen Zhang |
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| 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. |
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| Keywords: | cosmology observations - distance scale - galaxies distances and redshifts - methods statistical - supernovae general |
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