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首页> 外文期刊>The Astrophysical journal >PEERING THROUGH THE DUST: NuSTAR OBSERVATIONS OF TWO FIRST-2MASS RED QUASARS
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PEERING THROUGH THE DUST: NuSTAR OBSERVATIONS OF TWO FIRST-2MASS RED QUASARS

机译:穿越尘埃:两个前两个质量红色夸张的NuSTAR观测

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摘要

Some reddened quasars appear to be transitional objects in the paradigm of merger-induced black hole growth/galaxy evolution, where a heavily obscured nucleus starts to be unveiled by powerful quasar winds evacuating the surrounding cocoon of dust and gas. Hard X-ray observations are able to peer through this gas and dust, revealing the properties of circumnuclear obscuration. Here, we present NuSTAR and XMM-Newton/Chandra observations of FIRST-2MASS-selected red quasars F2M 0830+3759 and F2M 1227+3214. We find that though F2M 0830+3759 is moderately obscured (NH,Z?= (2.1?±?0.2) ×?1022 cm?2) and F2M 1227+3214 is mildly absorbed ( cm?2) along the line of sight, heavier global obscuration may be present in both sources, with cm?2 and 5.5?×?1023 cm?2 for F2M 0830+3759 and F2M 1227+3214, respectively. F2M 0830+3759 also has an excess of soft X-ray emission below 1 keV, which is well accommodated by a model where 7% of the intrinsic X-ray emission from the active galactic nucleus (AGN) is scattered into the line of sight. While F2M 1227+3214 has a dust-to-gas ratio (E(B – V)/NH) consistent with the Galactic value, the value of E(B – V)/NH for F2M 0830+3759 is lower than the Galactic standard, consistent with the paradigm that the dust resides on galactic scales while the X-ray reprocessing gas originates within the dust sublimation zone of the broad-line region. The X-ray and 6.1 μm luminosities of these red quasars are consistent with the empirical relations derived for high-luminosity, unobscured quasars, extending the parameter space of obscured AGNs previously observed by NuSTAR to higher luminosities.
机译:在合并引起的黑洞生长/星系演化的范式中,一些变红的类星体似乎是过渡物体,在那里,强烈的类星体风散发出周围的尘埃和气体,开始揭开一个严重遮盖的核。硬X射线观察能够穿透这种气体和尘埃,揭示出环核遮盖物的特性。在这里,我们介绍FIRST-2MASS选择的红色类星体F2M 0830 + 3759和F2M 1227 + 3214的NuSTAR和XMM-Newton / Chandra观测。我们发现,尽管F2M 0830 + 3759被中度遮盖了(NH,Z =(2.1?±?0.2)×?1022 cm?2),F2M 1227 + 3214沿视线被了中等吸收(cm?2),两种来源都可能存在较大的整体遮盖力,对于F2M 0830 + 3759和F2M 1227 + 3214分别为cm?2和<5.5?×?1023 cm?2。 F2M 0830 + 3759还具有低于1 keV的过量软X射线发射,该模型很好地适应了该模型,其中有源银河原子核(AGN)的固有X射线发射的7%被散射到视线中。 F2M 1227 + 3214的粉尘气比(E(B – V)/ NH)与银河系值一致,而F2M 0830 + 3759的E(B – V)/ NH值低于银河系符合尘埃停留在银河尺度上而X射线处理气体起源于宽线区域的尘埃升华区内的范式。这些红色类星体的X射线和6.1μm的发光度与从高亮度,无遮盖类星体得出的经验关系一致,从而将NuSTAR先前观察到的遮盖AGN的参数空间扩展到了更高的发光度。
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