伽马噪窄线赛弗特1型星系的长期红外光变和颜色变化  

The Long-term Infrared Brightness and Color Variabilities ofγ-ray-loud Narrow-line Seyfert 1 Galaxies

作　　者：毛李胜[1] Mao Lisheng(School of Physics and Electronic Information,Yunnan Normal University,Kunming 650500,China)

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650500

出　　处：《天文研究与技术》2021年第2期162-172,共11页Astronomical Research & Technology

基　　金：国家自然科学基金(12063007,11863007);云南省教育厅科学研究基金(2020J0094)资助.

摘　　要：一些窄线赛弗特(Seyfert)1型星系因具有GeV伽马射线辐射(伽马噪)而受到持续关注,截至目前,共报道22个伽马噪窄线赛弗特1型星系,另有3个高置信度候选体。利用广域红外巡天探测器(Wide-field Infrared Survey Explorer,WISE)数据平台,获取了这些源W 1(3.4μm)和W 2(4.6μm)两个红外波段的2010年1月至2019年12月同时性测光数据。采用参数V和标准额外方差σ_(NXV)^(2)NXV方法,分析了它们的长期光变现象,结果表明,24个源表现出长期亮度(W 1星等)变化,17个源表现出长期颜色(W_(1)-W_(2))变化。通过研究颜色与星等的相关性,发现7个源表现出变亮变红现象(Redder-When-Brighter,RWB),4个源表现出变亮变蓝现象(Bluer-When-Brighter,BWB)。最后简要讨论了颜色变化的可能解释和暗示。The detection of GeVγ-rays from some narrow-line Seyfert 1 galaxies(γ-ray-loud NLS1s)has received increasing attention.Up to now,22γ-ray-loud NLS1s and other 3 high-confidence candidates has been reported.Using the data platform of Wide-field Infrared Survey Explorer(WISE),we derived the simultaneous photometric data in the W 1(3.4μm)and W 2(4.6μm)bands(from January 2010 to December 2019)for these sources.Then we analyzed their long-term variability via the parameter V and the normalized excess varianceσ_(NXV)^(2) methods.It was found that 24 sources showed long-term brightness(W 1 magnitude)variabilities,and 17 sources showed long-term color(W 1-W 2)variabilities.When studying the correlation between color and magnitude,we found that 7 sources showed a redder-when-brighter(RWB)trend,and 4 sources showed a trend of bluer-when-brighter(BWB).Finally,the possible causes of color changes and implication are briefly discussed.

关 键 词：赛弗特星系 伽马射线 红外光变 统计 

分 类 号：P157[天文地球—天文学]