2013年NGC 5548的Swift/UVOT棱栅监测：MgII混响映射的尝试
Swift/UVOT grism monitoring of NGC 5548 in 2013: an attempt at MgII reverberation mapping
摘要：
基于混响映射的标度关系常被用来从活动星系核的单历元谱估计黑洞的质量。虽然半径-光度关系是这些标度关系的基础，是使用附近活动星系核中H $β$线的混响映射来确定的，但标度关系通常被扩展到使用其他宽发射线，如MgII，以便在H $β$红移到光学波段之外时获得更高红移的黑洞质量。然而，没有直接从MgII确定的半径-光度关系。在这里，我们提出了一个尝试，以执行混响映射使用MgII在附近的Seyfert 1，NGC 5548研究。我们使用Swift从2013年4月到9月每两天获得一次NGC 5548的UV棱镜光谱。与Swift同时进行的光度紫外监测提供了一个确定的连续光曲线，显示出很强的可变性。然而，MgII发射线与连续可变性没有很强的相关性，并且两者之间没有显著的滞后。我们讨论这些结果的背景下，使用镁II标度关系估计高红移黑洞质量。
英文摘要：
Reverberation-mapping-based scaling relations are often used to estimate the masses of black holes from single-epoch spectra of AGN. While the radius-luminosity relation that is the basis of these scaling relations is determined using reverberation mapping of the H$β$ line in nearby AGN, the scaling relations are often extended to use other broad emission lines, such as MgII, in order to get black hole masses at higher redshifts when H$β$ is redshifted out of the optical waveband. However, there is no radius-luminosity relation determined directly from MgII. Here, we present an attempt to perform reverberation mapping using MgII in the well-studied nearby Seyfert 1, NGC 5548. We used Swift to obtain UV grism spectra of NGC 5548 once every two days from April to September 2013. Concurrent photometric UV monitoring with Swift provides a well determined continuum lightcurve that shows strong variability. The MgII emission line, however, is not strongly correlated with the continuum variability, and there is no significant lag between the two. We discuss these results in the context of using MgII scaling relations to estimate high-redshift black hole masses.
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