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A POPULATION OF DUST-RICH QUASARS AT z ~ 1.5

机译:z〜1.5处尘埃丰富的类星群

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摘要

We report Herschel SPIRE (250, 350, and 500 μm) detections of 32 quasars with redshifts 0.5 ≤z 3.6 from the Herschel Multi-tiered Extragalactic Survey (HerMES). These sources are from a MIPS 24 μm flux-limited sample of 326 quasars in the Lockman Hole Field. The extensive multi-wavelength data available in the field permit construction of the rest-frame spectral energy distributions (SEDs) from ultraviolet to the mid-infrared for all sources, and to the far-infrared (FIR) for the 32 objects. Most quasars with Herschel FIR detections show dust temperatures in the range of 25-60?K, with a mean of 34?K. The FIR luminosities range from 1011.3 to 1013.5? L ☉, qualifying most of their hosts as ultra- or hyper-luminous infrared galaxies. These FIR-detected quasars may represent a dust-rich population, but with lower redshifts and fainter luminosities than quasars observed at ~1?mm. However, their FIR properties cannot be predicted from shorter wavelengths (0.3-20 μm, rest frame), and the bolometric luminosities derived using the 5100?? index may be underestimated for these FIR-detected quasars. Regardless of redshift, we observed a decline in the relative strength of FIR luminosities for quasars with higher near-infrared luminosities.
机译:我们从Herschel多层河外调查(HerMES)报告了32个类星体的Herschel SPIRE(250、350和500μm)检测结果,其红移为0.5≤z<3.6。这些来源来自洛克曼霍尔场中326个类星体的MIPS 24μm磁通受限样品。现场可获得的广泛的多波长数据允许构建从所有光源的紫外线到中红外,再到32个物体的远红外(FIR)的其余帧光谱能量分布(SED)。大多数采用Herschel FIR检测的类星体的粉尘温度范围为25-60?K,平均为34?K。 FIR的亮度范围从1011.3到1013.5? L☉,使它们的大部分宿主成为超发光或超发光红外星系。这些FIR检测到的类星体可能代表着尘埃丰富的种群,但与〜1?mm处观察到的类星体相比,其红移和发光度较低。但是,它们的FIR特性不能从较短的波长(0.3-20μm,静止帧)中预测,并且使用5100λλ得出的辐射热亮度。这些FIR检测到的类星体的指数可能被低估了。无论是否发生红移,我们观察到具有较高近红外光度的类星体的FIR光度的相对强度都在下降。
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