论文标题
高度学分的Quasar HE 0413-4031的MGII宽线响应的时间延迟测量：对基于MGII的Radius-Luminity Relation的影响
Time-delay measurement of MgII broad line response for the highly-accreting quasar HE 0413-4031: Implications for the MgII-based radius-luminosity relation
论文作者
论文摘要
我们根据南非大型望远镜（SALT）的六年监控，对AGN连续体和MGII宽线排放（$ Z = 1.38 $）进行监测。我们设法使用七种不同的方法（Interpolated交叉相关功能（ICCF），离散相关功能（DCF），$ Z $ -Transformed DCF，两种估算剂，估算ne估算数据，估计量（ICCF），估算源的$ 302.6^{+28.7} _ {+28.7} _ { - 33.1} $ days $ days $ $χ^2 $方法。这个时间延迟低于标准半径 - 光度关系所期望的值。但是，基于源和SED建模的单色光度，我们将这一离开视为由于源较高的积聚速率而导致的时间延迟的缩短，而推断的Eddington比率为$ \ sim 0.4 $。 HE 0413-4031的MGII线光度响应连续变异性，为$ l _ {\ rm line} \ propto l _ {\ rm cont}^{0.43 \ pm 0.10} $，与Mgii Exmission At $ rm _的位置一致，这是一致的10^{18} \，{\ rm cm} $。使用其他10种类星体的数据，我们确认了宽MGII系的半径 - 亮度关系，该线路以前是针对低红移源的宽H $β$线确定的。此外，我们检测到与h $β$样本相比，与这种关系的一般性不同。在对轻轨距离进行积聚率校正后，基于MGII的半径 - 亮度关系的少量散布仅为$ 0.10 $ dex。
We present the monitoring of the AGN continuum and MgII broad line emission for the quasar HE 0413-4031 ($z=1.38$) based on the six-year monitoring by the South African Large Telescope (SALT). We managed to estimate a time-delay of $302.6^{+28.7}_{-33.1}$ days in the rest frame of the source using seven different methods: interpolated cross-correlation function (ICCF), discrete correlation function (DCF), $z$-transformed DCF, JAVELIN, two estimators of data regularity (Von Neumann, Bartels), and $χ^2$ method. This time-delay is below the value expected from the standard radius-luminosity relation. However, based on the monochromatic luminosity of the source and the SED modelling, we interpret this departure as the shortening of the time-delay due to the higher accretion rate of the source, with the inferred Eddington ratio of $\sim 0.4$. The MgII line luminosity of HE 0413-4031 responds to the continuum variability as $L_{\rm line}\propto L_{\rm cont}^{0.43\pm 0.10}$, which is consistent with the light-travel distance of the location of MgII emission at $R_{\rm out} \sim 10^{18}\,{\rm cm}$. Using the data of 10 other quasars, we confirm the radius-luminosity relation for broad MgII line, which was previously determined for broad H$β$ line for lower-redshift sources. In addition, we detect a general departure of higher-accreting quasars from this relation in analogy to H$β$ sample. After the accretion-rate correction of the light-travel distance, the MgII-based radius-luminosity relation has a small scatter of only $0.10$ dex.
