A gravitationally lensed quasar discovered in OGLE

A gravitationally lensed quasar discovered in OGLE
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OGLE 中发现的引力透镜类星体

DOI:
10.1093/mnras/sty259
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发表时间:
2018
影响因子:
4.8
通讯作者:
Kostrzewa-Rutkowska Z
Kostrzewa-Rutkowska Z
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kostrzewa-Rutkowska Z

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我们报告在光学引力透镜实验(OGLE)中发现了一个新的引力透镜类星体(双),该类星体在麦哲伦星云周围的~670deg2区域内被识别。该源被选为来自 WISE 的 ~60 个“redW1 −W2”中红外物体之一,并且对于两个(或更多)附近的源,在 OGLE 中具有显着的可变性。这是引力透镜的首次探测,这一发现是“相反”的,这意味着我们首先测量了 −132 <tAB< −76  d (90% CL) 的两个透镜类星体图像之间的时间延迟,中值 tAB ≈ −102  d(在观察者坐标系中),并且较暗的图像 B 滞后于图像 A。该系统由两个部分组成天空中相隔 1.5  角秒的类星体图像,分别为 I≈ 20.0  星等和 I≈ 19.6  星等,以及在减去两个透镜图像后,可检测到的透镜星系为 I≈ 21.5  星等源,距图像 A 1.0  角秒。两张类星体图像在新技术望远镜光谱中都显示出清晰的 AGN 宽发射线 atz= 2.16。与固定源红移拟合的光谱能量分布(SED)提供了透镜星系红移的估计值 z≈ 0.9 ± 0.2(90% CL),而其类型更有可能是椭圆形(SED 推断和透镜模型恒星质量更有可能出现在椭圆形中)而不是螺旋形(透镜模型首选红移)。
We report the discovery of a new gravitationally lensed quasar (double) from the Optical Gravitational Lensing Experiment (OGLE) identified inside the ∼670deg2area encompassing the Magellanic Clouds. The source was selected as one of ∼60 ‘redW1 −W2’ mid-infrared objects fromWISEand having a significant amount of variability in OGLE for both two (or more) nearby sources. This is the first detection of a gravitational lens, where the discovery is made ‘the other way around’, meaning we first measured the time delay between the two lensed quasar images of −132 <tAB< −76  d (90 per cent CL), with the mediantAB≈ −102  d (in the observer frame), and where the fainter image B lags image A. The system consists of the two quasar images separated by 1.5 arcsec on the sky, withI≈ 20.0 mag andI≈ 19.6 mag, respectively, and a lensing galaxy that becomes detectable asI≈ 21.5 mag source, 1.0 arcsec from image A, after subtracting the two lensed images. Both quasar images show clear AGN broad emission lines atz= 2.16 in the New Technology Telescope spectra. The spectral energy distribution (SED) fitting with the fixed source redshift provided the estimate of the lensing galaxy redshift ofz≈ 0.9 ± 0.2 (90 per cent CL), while its type is more likely to be elliptical (the SED-inferred and lens-model stellar mass is more likely present in ellipticals) than spiral (preferred redshift by the lens model).
OGLE-IV银河核球微透镜巡天数据中的光度不确定度分析
DOI: --
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