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961.
Li Ma Luo-En Chen Guang-Zhong Xie Ji-Yang Ren Zhao-Hua Xie Shu-Bai Zhou Hui Wu Dong-Cheng Mei 《中国天文和天体物理学报》2007,7(3):345-352
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. 相似文献
962.
Yan-Chuan Cai Jun Pan Purple Mountain Observatory Chinese Academy of Sciences Nanjing National Astronomical Observatories Chinese Academy of Sciences Beijing 《中国天文和天体物理学报》2007,7(1):51-62
1 INTRODUCTION Large redshift surveys of galaxies provide us with distances estimated from measured redshifts to complete our three-dimensional topography of the visible universe. However, due to the peculiar velocities of galax- ies, the inferred redshif… 相似文献
963.
Min Wang Rui-Xiang Xie Yi-Hua Yan Yu-Ying Liu 《中国天文和天体物理学报》2007,7(4):477-486
Three particularly complex radio bursts (2001 October 19, 2001 April 10 and 2003 October 26) obtained with the spectrometers (0.65-7.6GHz) at the National Astronomical Observatories, Chinese Academy of Sciences (NAOC, Beijing and Yunnan) and other in- struments (NoRH, TRACE and SXT) are presented. They each have two groups of peaks occurring in different frequency ranges (broad-band microwave and narrow-band decimeter wavelengths). We stress that the second group of burst peaks that occurred in the late phase of the flares and associated with post-flare loops may be homologous radio bursts. We think that they are driven by the post-flare loops. In contrast to the time profiles of the radio bursts and the images of coronal magnetic polarities, we are able to find that the three events are caused by the active regions including main single-bipole magnetic structures, which are associated with multipole magnetic structures during the flare evolutions. In particular, we point out that the later decimetric radio bursts are possibly the radio counterparts of the homologous flares (called "homologous radio bursts" by us), which are also driven by the single-bipole mag- netic structures. By examining the evolutions of the magnetic polarities of sources (17GHz), we could presume that the drivers of the homologous radio bursts are new and/or recurring appearances/disappearances of the magnetic polarities of radio sources, and that the triggers are the magnetic reconnections of single-bipole configurations. 相似文献
964.
Yong-Feng Huang Ye Lu Anna Yuen Lam Wong Kwong Sang Cheng 《中国天文和天体物理学报》2007,7(3):397-404
Due to the relativistic motion of gamma-ray burst remnant and its deceleration in the circumburst medium, the equal arrival time surfaces at any moment are not spherical, rather, they are distorted ellipsoids. This will leave some imprints in the afterglows. We study the effect of equal arrival time surfaces numerically for various circumstances, i.e., isotropic fireballs, collimated jets, density jumps and energy injection events. For each case, a direct comparison is made between including and not including the effect. For isotropic fireballs and jets viewed on axis, the effect slightly hardens the spectra and postpones the peak time of the afterglows, but does not change the shapes of the spectra and light curves significantly. In the cases of a density jump or an energy injection, the effect smears out the variations in the afterglows markedly. 相似文献
965.
运用法国巴黎默东天文台记录的暗条目录资料构造了一个时间精度为每天的暗条数目序列,选用Scargle周期图和Morlet小波变换两种周期方法研究了这个序列的周期性,发现其存在4个显著的周期,它们分别是1557天、1141天、795天和367天,详细分析了这些周期的时变特征,并简单讨论了其中个别典型周期的相位、物理机制和相互关系. 相似文献
966.
967.
This is the third paper in a series connected with our Multiwavelength Quasar Survey. The survey is aimed to provide a quasar sample more complete than any previous survey by using a combined selection technique to reduce selection effects. We present the observational results for the X-ray candidates in field f836. We found 15 X-ray AGNs in this field of which eight are new discoveries. The X-ray data and optical spectra of these AGNs are given. We give the X-ray candidate selection criteria, which proved to be highly efficient in isolating X-ray AGNs. 相似文献
968.
969.
Zhi-Qiang Yin Yan-Ben Han Li-Hua Ma Gui-Ming Le Yong-Gang Han National Astronomical Observatories Chinese Academy of Sciences Beijing Key Laboratory of Radiometric Calibration Validation for Environmental Satellites China Meteorological Administration Beijing Graduate School of Chinese Academy of Sciences Beijing 《中国天文和天体物理学报》2007,7(6):823-830
We use wavelet transform to analyze the daily relative sunspot number series over solar cycles 10-23. The characteristics of some of the periods shorter than ~ 600-day are discussed. The results exhibit not only the variation of some short periods in the 14 solar cy-cles but also the characteristics and differences around solar peaks and valley years. The short periodic components with larger amplitude such as ~27,~150 and ~360-day are obvious in some solar cycles,all of them are time-variable,also their lengths and amplitudes are vari-able and intermittent in time. The variable characteristics of the periods are rather different in different solar cycles. 相似文献
970.
统计分析了国家天文台2.6-3.8 GHz高时间分辨率射电动态频谱仪在23周峰年期间(1998.4—2003.1)观测到的266个III型爆发.对这些事件的频率漂移、持续时间、偏振、带宽、开始和结束频率做了详细分析.开始和结束频率的统计分析表明,开始频率在一个非常大的范围,从小于2.6 GHz到大于3.8 GHz,而结束频率的截止区相对集中,从2.82-3.76 G.Hz.这些现象说明,电子加速的高度相当分散,在观测频率范围内具有正、负漂移率的III型爆发数基本相等,这可能意味着被加速的向上和向下传播的电子束在2.6—3.8 GHz范围有相同的比例.统计结果表明,微波III型爆发的辐射机制主要是等离子体辐射和电子回旋脉泽辐射过程. 相似文献