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耀变体变亮变蓝现象获双重验证
2020-03-01 15:22   来源:  www.oceanofgameso.com   评论:0 点击:

耀变体变亮变蓝现象获双重验证???????记者9日从云南天文台获悉,该台研究人员依托我国最大的通用光学望远镜

???????记者9日从云南天文台获悉,该台研究人员依托我国最大的通用光学望远镜——丽江天文观测站米望远镜,通过观测耀变体准同时性光谱变化及测光光变,开展了耀变体光变与颜色变化的相关性研究。光谱和测光观测都发现了变亮变蓝现象,并且颜色与亮度、颜色变化率与亮度变化率之间强相关,颜色变化比亮度变化超前。美国天文学会会刊《天体物理学杂志》在线发表了这一最新研究成果。

? ?? ?? ?? On the 9th, the reporter learned from the yunnan observatory that the researchers rely on the largest general optical telescope in china, the lijiang astronomical observatory, to carry out a study on the correlation between the light change and the color change of the flare by observing the quasi-simultaneous spectral change and the light change of the flare. Both spectral and photometric observations have found the phenomenon of bright blue, and the color is strongly correlated with the brightness, the change rate of color and the change rate of brightness, and the change of color is ahead of the change of brightness. The latest research is published online in the journal Astrophysical Journal of the American Astronomical Society.

???????耀变体是一类特殊的活动星系核,其相对论喷流与视线夹角比较小。变亮变蓝是耀变体中一种特殊的光变现象,在颜色星等图上表现为一种相关性,被视为喷流激波模型的观测证据,但此前的诸多研究观测,并未发现耀变体有这种相关性或者只发现弱的相关性。

? ?? ?? ?? Yao variant is a special type of active galactic nucleus, its relativistic jet and line of sight angle is relatively small. Bright blue is a special phenomenon of light change in yao variant, which is regarded as the observational evidence of jet shock model, but many previous studies have not found this correlation or only found weak correlation.

???????在2018年11月至2019年3月期间,云南天文台博士研究生封海成、刘洪涛研究员、白金明研究员等人利用丽江米望远镜,成功地对TeV伽马射线耀变体S50716 714进行了45次分光观测和44次多波段测光观测。

? ?? ?? ?? between november 2018 and march 2019, yunnan observatory ph.d. graduate student feng haicheng, liu tao researcher, platinum researcher and others successfully performed 45 spectroscopy observations and 44 multi-band optical observations on tev gamma ray flare variant s50716714 using lijiang miwangyuan mirror.

???????他们研究发现这一耀变体的准同时性光谱和测光光变都有变亮变蓝趋势。在亮度变化率—颜色变化率图上,变亮变蓝的趋势更为明显。他们还进一步发现,光谱指数变化超前于流量密度变化,色指数变化超前于星等变化。变亮变蓝的出现可能依赖于观测频率范围相对于同步辐射峰值频率的位置,例如观测频率范围在同步峰值频率的左侧。

? ?? ?? ?? They found that the quasi-synchrony spectra and photoluminescence of the flare variant showed a tendency to brighten and turn blue. On the brightness change rate-color change rate map, the trend of brightening and turning blue is more obvious. They further found that the spectral index changes ahead of the flow density, and the color index changes ahead of the star. the emergence of brightening blue may depend on the location of the observed frequency range relative to the peak frequency of synchronous radiation, e.g. the observed frequency range is on the left of the synchronous peak frequency.

???????另外经过细致的数据分析,包括数据预处理、光谱和测光流量定标,以及光谱拟合,他们还测得了相应物理量的时间序列,结果发现光谱指数变化率、光谱流量密度变化率、流量密度相对变化率、色指数变化率及星等变化率这些量之间存在强相关性。这些新发现,可让人们更好地理解耀变体中的辐射机制及光变机制。(记者赵汉斌通讯员陈艳)

? ?? ?? ?? In addition, after careful data analysis, including data preprocessing, spectral and photometric flow calibration, and spectral fitting, they also measured the time series of corresponding physical quantities, and found that there was a strong correlation between spectral index change rate, spectral flow density change rate, flow density relative change rate, color index change rate and star change rate. These new findings provide a better understanding of the radiation and light-change mechanisms in the variants. (Reporter, Zhao Hanbin Correspondent, Chen Yan)


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