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首页> 外文期刊>The Astrophysical journal >Young Stars and Nonstellar Emission in the Aligned Radio Galaxy 3C 256*
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Young Stars and Nonstellar Emission in the Aligned Radio Galaxy 3C 256*

机译:对准的收音机Galaxy 3C 256中的年轻恒星和非恒星发射*

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We present ground-based images of the z = 1.824 radio galaxy 3C 256 in the standard BVRIJHK filters and an interference filter centered at 8800 ?, a Hubble Space Telescope image in a filter dominated by Lyα emission (F336W), and spectra covering rest-frame wavelengths from Lyα to [O III] λ5007. Together with published polarimetry observations, we use these to decompose the overall spectral energy distribution into nebular continuum emission, scattered quasar light, and stellar emission. The nebular continuum and scattered light together comprise half (one-third) of the V-band (K-band) light within a 4'' aperture and are responsible for the strong alignment between the opticalear-infrared light and the radio emission. The stellar emission is dominated by a population estimated to be 100-200 Myr old (assuming a Salpeter IMF) and formed in a short burst with a peak star formation rate of 1-4 × 103 M☉ yr-1. The total stellar mass is estimated to be no more than 2 × 1011 M☉, which is far less than other luminous radio galaxies at similar redshifts, and suggests that 3C?256 will undergo further star formation or mergers.
机译:我们在标准BVRIJHK滤镜中展示了z = 1.824射电星系3C 256的地面图像,并在8800?中心给出了干涉滤镜,在Lyly发射(F336W)为主的滤镜中展示了哈勃太空望远镜的图像,并且光谱覆盖了其余的框架波长从Lyα到[O III]λ5007。连同已发表的极化观测,我们使用它们将整体光谱能量分布分解为星云连续体发射,散射类星体光和恒星发射。星云连续光和散射光共同构成4英寸孔径内V波段(K波段)光的一半(三分之一),并导致光学/近红外光与无线电发射之间的强烈对准。恒星发射主要由估计为100-200 Myr的种群(假定为Salpeter IMF)主导,并以短时爆发形成,峰值恒星形成率为1-4×103M☉yr-1。总的恒星质量估计不超过2×1011M☉,这远小于处于类似红移状态的其他发光射电星系,并暗示3C?256将经历进一步的恒星形成或合并。

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