类星体3C273的近红外光变性质  

The Infrared Variability of 3C 273

作　　者：文盛乐[1] 彭智敏[2,3] 樊军辉[2] 谢光中[3] 

机构地区：[1]湖南师范大学物理系,长沙410081 [2]广州大学天体物理中心,广州510400 [3]云南大学物理系,昆明650000 [4]中国科学院云南天文台,昆明650011

出　　处：《天文学报》2002年第2期140-144,共5页Acta Astronomica Sinica

基　　金：国家自然科学基金(19973001);国家"973计划"(NKBRSFG 19990754)资助

摘　　要：收集了类星体3C273的近红外资料,许由此讨论了该天体的光变性质.我们发现3C273的最大红外光变分别为△J=1.0m,△H=0.90m,△K=0.82m。In this paper, the near-infrared data are compiled from the available literature for the quasar 3C 273 and are used to analyze the variability properties. The largest amplitudes of the near-IR variation are △J =1.0,△H=0.9, △K=0.86, and the color indexes are <J-H> =0.82, <J-K> = 1.96, <H-K> =1.13. The discrete correlation function (DCF) method indicates that the variability between any two infrared bands is correlated without time lag. The relation between the color index and the brightness is also investigated and the result indicates that the spectrum steeps when the source dims but the spectrum flattens when the source dims further suggesting that the emissions of 3C 273 in near-IR consist of at least two components. Some discussions are presented.

关 键 词：星系 类星体 3C273 基本参数 色指数 星等 近红外光谱性质 

分 类 号：P158[天文地球—天文学]