标题： 年轻射电星系中的黑洞质量、爱丁顿比率以及M_bh-σ_[O III]关系 显示英文标题

标题： The black hole mass, Eddington ratio, and M_bh-σ_[O III] relation in young radio galaxies

摘要： 这些年轻射电星系的黑洞质量及爱丁顿比率是通过多种方法估算的。样本包括27个GPS和38个CSS源。我们发现这些年轻射电星系的平均黑洞质量为<log M_bh>=8.3，小于射电明亮类星体和低红移射电星系的平均黑洞质量(<log M_bh>=9.0)。CSS/GPS源具有相对较高的爱丁顿比率，平均比值为<log L_bol/L_Edd>=-0.56，这与窄线 Seyfert 1 星系（NLS1s）的比率相似。这表明CSS/GPS源可能不仅处于射电活动的早期阶段，也处于吸积活动的早期阶段。我们发现，当使用\sigma _[O III]作为恒星速度弥散\sigma _*的替代指标时，这些年轻射电星系作为一个类别明显偏离由附近非活动星系定义的M_bh-\sigma _*关系。[O III]发射线宽度的偏差$\Delta\sigma$=\sigma _[O III]-\sigma _[pred]与喷流/吸积功率之间没有显著相关性，其中\sigma _[pred]是根据Tremaine等人的关系利用估算的黑洞质量计算得到的。 然而，我们发现年轻射电星系中的偏差$\Delta\sigma$与爱丁顿比率有很好的相关性，这种相关性被发现与无射电喷流或射电喷流较弱的射电宁静活动星系核（QSOs/NLS1s）的相关性类似。我们认为吸积活动可能在这些年轻射电星系的[O III]窄线动力学结构中仍然起着重要作用。 显示英文摘要

摘要： The BH masses and the Eddington ratios for a sample of 65 young radio galaxies [27 GPS and 38 CSS sources] are estimated by various methods. We find that the average BH mass of these young radio galaxies is <log M_bh>=8.3, which is less than that of radio loud QSOs and low redshift radio galaxies(<log M_bh>=9.0). The CSS/GPS sources have relatively high Eddington ratios with average ratio <log L_bol/L_Edd>=-0.56, which are similar to those of narrow line Seyfert 1 galaxies (NLS1s). It suggests that the CSS/GPS sources may not only be in the early stage of radio activities, but also in the early stage of their accretion activities. We find that the young radio galaxies as a class deviate systematically from the M_bh-\sigma_* relation defined by nearby inactive galaxies, when using \sigma_[O III] as a surrogate for the stellar velocity dispersion \sigma_*. There is no significant correlation between the deviation of the [O III] emission line width, $\Delta\sigma$=\sigma_[O III]-\sigma_[pred], and the jet/accretion power, where \sigma_[pred] are calculated from the Tremaine et al. relation using the estimated BH masses. However, we find that the deviation $\Delta\sigma$ in young radio galaxies is well correlated with the Eddington ratio, and this correlation is found to be similar to that of radio quiet AGN (QSOs/NLS1s) where the radio jet is absent or weak. We suggest that the accretion activities may still play an important role in shaping the kinematics of [O III] narrow line in these young radio galaxies.