SDSS J125438.25+114105.8的光学微光变观测  

Search for Opitcal Microvariability in SDSS J125438.25+114105.8

作　　者：时光[1,2] 单红光[1] 

机构地区：[1]中国科学院国家天文台/云南天文台,昆明650011 [2]中国科学院研究生院,北京100039

出　　处：《天文学进展》2011年第4期452-458,共7页Progress In Astronomy

基　　金：国家自然科学基金(11033007);973计划(2009CB824800;2007CB815405)

摘　　要：利用云南天文台丽江2.4m望远镜对一个新发现的射电噪窄线赛弗特1(RL-NLS1)活动星系核SDSSJ125438.25+114105.8进行了光学波段的短时标监测,观测结果表明,SDSSJ125438.25+114105.8存在光学微光变,典型的光变幅度为0.05～0.1 mag,光变时标仅为h的量级。这个天体是到目前为止极少数几个探测到光学微光变的RL-NLSl之一,推断出它的光学光度至少有一部分是来自相对论性喷流的贡献,支持了对RL-NLSl活动星系核的多波段研究结果^([1])以及最近Fermi卫星的高能γ射线辐射的探测结果。SDSS J125438.25＋114105.8 is a newly identified radio-loud narrow-line Seyfert 1 galaxy, a recently discovered new class of active galactic nuclei, which was suggested to have relativistic jets aligned to the line of sight based on recent observations. We searched for optical microvariability in SDSS J125438.25＋i 14105.8 in four nearly successive observing nights, with the LiJiang 2.4-m telescope of Yunnan Observatory. Rapid variations of the optical emission were detected on timescales as short as a few hours, with the maximum amplitude reaching nearly 0.1 mag. This is the second reported case of optical rrticrovariability detected in radio-loud NLS 1 galaxies. Our result indicates that its observed optical light is significantly contributed by non-thermal emission, most likely from relativistic jets, suggested by the study of multiwavelength properties as well as the most recent y-ray observations made with the Fermi satellite.

关 键 词：活动星系核 赛弗特星系 类星体 测光 喷流 SDSS J125438.25+114105.8 

分 类 号：P157.6[天文地球—天文学]