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X-ray emission from radio-quiet quasars in the SDSS Early Data Release. The alpha_ox dependence upon UV luminosity

机译:sDss早期数据发布中来自无线电静音类星体的X射线发射。   alpha_ox依赖于UV光度

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摘要

We investigate the X-ray properties of the color-selected radio-quiet quasars(RQQs) in the Sloan Digital Sky Survey (SDSS) Early Data Release using ROSAT,Chandra, and XMM-Newton data. In the 0.16-6.28 redshift range, 136 RQQs haveX-ray detections (69 from the ROSAT All-Sky Survey, RASS), while for 70 RQQsX-ray upper limits are obtained. The well-defined selection method utilized bythe SDSS, coupled with the tight radio constraints from the FIRST/NVSS surveys,allow us to define a representative sample of optically selected RQQs whosebroad-band spectral energy distributions (characterized by means of theoptical-to-X-ray spectral index, alpha_ox) can be studied as a function ofrest-frame ultraviolet (UV) luminosity and redshift. A partial correlationanalysis applied to the SDSS sample (including the upper limits, but excludingthe biased subsample of RASS detections) shows that alpha_ox is a function ofrest-frame UV luminosity (i.e., alpha_ox steepens at high UV luminosities);this correlation is significant at the 3.7 sigma level. We do not detect ahighly significant redshift dependence of alpha_ox. We also find a significant(7.8 sigma level) correlation between UV and X-ray luminosity. Thiscorrelation, parameterized by Lx \propto Luv^{0.75+/-0.06}, extends previousresults to the highest redshifts.
机译:我们在使用ROSAT,Chandra和XMM-Newton数据的斯隆数字天空测量(SDSS)早期数据发布中,研究了选色的放射性静类星体(RQQs)的X射线特性。在0.16-6.28红移范围内,有136个RQQ进行了X射线检测(来自ROSAT All-Sky Survey,RASS的检测值为69),而获得了70个RQQ的X射线上限。 SDSS使用的定义明确的选择方法,加上FIRST / NVSS调查的严格无线电约束,使我们能够定义具有代表性的光学选择RQQ的样本,其宽带频谱能量分布(通过光学到X表征)射线光谱指数,α_ox)可以作为静止帧紫外线(UV)亮度和红移的函数进行研究。应用于SDSS样本的部分相关分析(包括上限,但不包括RASS检测的有偏子样本)显示alpha_ox是其余帧UV光度的函数(即,alpha_ox在高UV光度时变陡); 3.7西格玛水平我们没有检测到高度重要的alpha_ox红移依赖性。我们还发现紫外线和X射线光度之间存在显着的相关性(7.8西格玛水平)。由Lx \ propto Luv ^ {0.75 +/- 0.06}参数化的这种相关性将先前的结果扩展到最高的红移。

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