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arXiv 1608.01967astro-ph.GA
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MaNGA巡天中的一个强透镜椭圆星系

A strong-lensing elliptical galaxy in the MaNGA survey

Russell J. Smith

摘要:

我报告发现了一个新的星系规模的引力透镜系统,确定使用公共数据从MANGA调查,作为一个系统的搜索透镜背景线发射器的一部分。透镜是SDSS J170124.01+372258.0,一个巨大的椭圆星系,速度色散为$σ=256$ km/s,红移为$z_l=0.122$。在模拟和减去目标星系光之后,积分场数据立方体显示了与$z_s=0.791$源相对应的[OII],[OIII]和H $β$发射线,在星系中心周围形成了一个可识别的环。爱因斯坦半径是$R_{Ein} \approx 2.3$ arcsec,在透镜的距离投影到~5 kpc。总投影透镜质量为$(3.6\pm0.6) \times 10^{11} M_\odot$,总J波段质光比为$3.0\pm0.7$太阳单位。对可能的暗物质含量的合理估计可以使其与类似于Milky Way的初始质量函数(预计M/L约为1.5)相一致,但目前的数据绝不能排除较重的IMF。另一种解释的系统,一个更复杂的源平面,也进行了讨论。这个系统的发现预示着未来的镜头搜索的基础上MaNGA和其他积分场光谱调查。

英文摘要:

I report discovery of a new galaxy-scale gravitational lens system, identified using public data from the MaNGA survey, as part of a systematic search for lensed background line-emitters. The lens is SDSS J170124.01+372258.0, a giant elliptical galaxy with velocity dispersion $σ=256$ km/s, at a redshift of $z_l=0.122$. After modelling and subtracting the target galaxy light, the integral-field data-cube reveals [OII], [OIII] and H$β$ emission lines corresponding to a source at $z_s=0.791$, forming an identifiable ring around the galaxy center. The Einstein radius is $R_{Ein} \approx 2.3$ arcsec, projecting to ~5 kpc at the distance of the lens. The total projected lensing mass is $(3.6\pm0.6) \times 10^{11} M_\odot$, and the total J-band mass-to-light ratio is $3.0\pm0.7$ solar units. Plausible estimates of the likely dark matter content could reconcile this with a Milky-Way-like initial mass function (for which M/L~1.5 is expected), but heavier IMFs are by no means excluded with the present data. An alternative interpretation of the system, with a more complex source plane, is also discussed. The discovery of this system bodes well for future lens searches based on MaNGA and other integral-field spectroscopic surveys.

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