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arXiv 2011.08212astro-ph.HEastro-ph.GA
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PG 1448+273超快外流的位置和能量

Location and energetics of the ultra-fast outflow in PG 1448+273

M. Laurenti, A. Luminari, F. Tombesi, F. Vagnetti, R. Middei, E. Piconcelli

摘要:

超快外流(UFOs)在活动星系核反馈机制中起着关键作用。因此,必须充分描述其位置和能量。我们研究的UFO在最新的XMM-牛顿档案观测的NLSy 1星系PG 1448+273通过一种新的建模工具,即风在电离核环境模型(WINE)。我们对PG 1448+273中UFO的探测是非常可靠的。流出的材料是高度电离的,$\logξ= 5.53_{-0.05}^{+0.04}$ erg s $^{-1}$ cm,具有大的柱密度,$N_\mathrm{H} = 4.5_{-1.1}^{+0.8} \times 10^{23}$ cm $^{-2}$,以最大速度$v_0 = 0.24^{+0.08}_{-0.06}\,c$(90% c.l.误差),并获得平均速度$v_\mathrm{avg} = 0.152\,c$。WINE非常成功地限制了$r_0=77_{-19}^{+31} \, r_\mathrm{S}$从黑洞的发射半径。我们还推导出风的开度角($θ> 72^{\circ}$)和覆盖因子($C_\mathrm{f} > 0.69$)的下限。我们发现质量流出率$\dot{M}_\mathrm{out}=0.65^{+0.44}_{-0.33}\,M_\odot \mathrm{yr}^{-1} = 2.0^{+1.3}_{-1.0}\, \dot{M}_\mathrm{acc}$和大的瞬时流出动能$\dot{E}_\mathrm{out}=4.4^{+4.4}_{-3.6} \times 10^{44}$ erg s $^{-1}$ = 24%$L_\mathrm{bol}$ = 18%$L_\mathrm{Edd}$($1 σ$误差)。我们发现,一个主要的误差贡献的能量是由于$r_0$,强调通过适当的光谱建模,如葡萄酒的准确测定的重要性。使用20雨燕(UVOT和XRT)观测和同步OM数据从XMM-牛顿,我们还发现,$α_\mathrm{ox}$经历了很大的变化,最大偏移$Δα_\mathrm{ox} =-0.7$,UFO被发现后,导致显着的X射线弱。这可能指向一个饥饿的内部吸积盘由于通过风的物质去除。

英文摘要:

Ultra-fast outflows (UFOs) play a key role in the AGN feedback mechanism. It is therefore important to fully characterize their location and energetics. We study the UFO in the latest XMM-Newton archival observation of the NLSy1 galaxy PG 1448+273 by means of a novel modeling tool, that is, the Wind in the Ionized Nuclear Environment model (WINE). Our detection of the UFO in PG 1448+273 is very robust. The outflowing material is highly ionized, $\logξ= 5.53_{-0.05}^{+0.04}$ erg s$^{-1}$ cm, has a large column density, $N_\mathrm{H} = 4.5_{-1.1}^{+0.8} \times 10^{23}$ cm$^{-2}$, is ejected with a maximum velocity $v_0 = 0.24^{+0.08}_{-0.06}\,c$ (90% c.l. errors), and attains an average velocity $v_\mathrm{avg} = 0.152\,c$. WINE succeeds remarkably well to constrain a launching radius of $r_0=77_{-19}^{+31} \, r_\mathrm{S}$ from the black hole. We also derive a lower limit on both the opening angle of the wind ($θ> 72^{\circ}$) and the covering factor ($C_\mathrm{f} > 0.69$). We find a mass outflow rate $\dot{M}_\mathrm{out}=0.65^{+0.44}_{-0.33}\,M_\odot \mathrm{yr}^{-1} = 2.0^{+1.3}_{-1.0}\, \dot{M}_\mathrm{acc}$ and a large instantaneous outflow kinetic power $\dot{E}_\mathrm{out}=4.4^{+4.4}_{-3.6} \times 10^{44}$ erg s$^{-1}$ = 24% $L_\mathrm{bol}$ = 18% $L_\mathrm{Edd}$ ($1 σ$ errors). We find that a major error contribution on the energetics is due to $r_0$, stressing the importance of an accurate determination through a proper spectral modeling, as done with WINE. Using 20 Swift (UVOT and XRT) observations and the simultaneous OM data from XMM-Newton, we also find that $α_\mathrm{ox}$ undergoes large variations, with a maximum excursion of $Δα_\mathrm{ox} =-0.7$, after the UFO is detected, leading to a remarkable X-ray weakness. This may point towards a starving of the inner accretion disk due to the removal of matter through the wind.

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