| Effects of Redshift on the Classifying Criteria of BL Lacertae Objects |
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| 作者姓名： | Li Ma Luo-En Chen Guang-Zhong Xie Ji-Yang Ren Zhao-Hua Xie Shu-Bai Zhou Hui Wu Dong-Cheng Mei |
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| 作者单位： | Li Ma1，3，Luo-En Chen2，3，Guang-Zhong Xie3，4，Ji-Yang Ren2，Zhao-Hua Xie1，Shu-Bai Zhou3，4，Hui Wu1 and Dong-Cheng Mei4 1 Department of Physics，Yunnan Normal University，Kunming 650092;2 Department of Physics，Yuxi Normal College，Yuxi 653100 3 National Astronomical Observatories/ Yunnan Observatory，Chinese Academy of Sciences，Kunming 650011 4 Department of Physics，Yunnan University，Kunming 650091 |
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| 基金项目： | 国家自然科学基金;中国科学院"西部之光"人才培养计划 |
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| 摘 要： | We have collected a sample of 70 BL Lacs (33 radio-selected BL Lacs and 37 X-ray selected BL Lacs) with multi-waveband data for investigating the classifying criteria of BL Lacertae Objects. For each source, we estimate its luminosities in radio, optical and X-ray, the broad-band spectral index from radio to X-ray and the peak frequency of the syn- chrotron emission, and make a statistical analysis of the data obtained. Our main results are as follows: (1) The broad-band spectral index and the peak frequency have no correlation with the redshift, while they are inversely correlated with each other and they could be regarded as equivalent classifying criteria of BL Lac objects. (2) There are significant effects of the luminosity/redshift relation on the observed luminosity distribution in our sample, hence, if the radio luminosity is to be used as a classifying criterion of BL Lac objects, it should not be regarded as equivalent to the broad-band spectral index or the peak frequency. (3) Our re- sults supply a specific piece of evidence for the suggestion that the use of luminosities always introduces a redshift bias to the data and show that the location of the peak frequency is not always linked to the luminosity of any wave band.
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| 关 键 词： | galaxies: BL Lacertae objects: general—galaxies: fundamental parameters— galaxies: high-redshift |
| 修稿时间： | 2006-07-19 |
Effects of Redshift on the Classifying Criteria of BL Lacertae Objects |
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| Li Ma Luo-En Chen Guang-Zhong Xie Ji-Yang Ren Zhao-Hua Xie Shu-Bai Zhou Hui Wu Dong-Cheng Mei.Effects of Redshift on the Classifying Criteria of BL Lacertae Objects[J].Chinese Journal of Astronomy and Astrophysics,2007,7(3):345-352. |
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| Authors: | Li Ma Luo-En Chen Guang-Zhong Xie Ji-Yang Ren Zhao-Hua Xie Shu-Bai Zhou Hui Wu Dong-Cheng Mei |
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| Abstract: | We have collected a sample of 70 BL Lacs (33 radio-selected BL Lacs and 37 X-ray selected BL Lacs) with multi-waveband data for investigating the classifying criteria of BL Lacertae Objects. For each source, we estimate its luminosities in radio, optical and X-ray, the broad-band spectral index from radio to X-ray and the peak frequency of the syn- chrotron emission, and make a statistical analysis of the data obtained. Our main results are as follows: (1) The broad-band spectral index and the peak frequency have no correlation with the redshift, while they are inversely correlated with each other and they could be regarded as equivalent classifying criteria of BL Lac objects. (2) There are significant effects of the luminosity/redshift relation on the observed luminosity distribution in our sample, hence, if the radio luminosity is to be used as a classifying criterion of BL Lac objects, it should not be regarded as equivalent to the broad-band spectral index or the peak frequency. (3) Our re- sults supply a specific piece of evidence for the suggestion that the use of luminosities always introduces a redshift bias to the data and show that the location of the peak frequency is not always linked to the luminosity of any wave band. |
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| Keywords: | galaxies:BL Lacertae objects:general-galaxies:fundamental parameters-galaxies:high-redshift |
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