The black hole mass, Eddington ratio and MBH–σ[O iii] relation in young radio galaxies
The black hole mass, Eddington ratio and MBH–σ[O iii] relation in young radio galaxies
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DOI：
10.1111/j.1365-2966.2009.15127.x
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发表时间：
2009-05
影响因子：
4.8
通讯作者：
Qingwen Wu
中科院分区：
文献类型：
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作者：
Qingwen Wu
本文用各种方法估算了65个年轻射电星系样本[27个千兆赫峰谱源（GPS）和38个致密陡谱源（CSS）]的中心超大质量黑洞（BH）质量和爱丁顿比。我们发现这些年轻射电星系的平均BH质量为（log M BH）<$8.3，小于射电大声类星体（QSO）和低红移射电星系的平均BH质量（（log M BH ><$9.0）。CSS/GPS源具有相对较高的爱丁顿比，其平均比值（log L bol /L Edd > =-0.56）与窄线Seyfert 1星系（NLSls）相似。这表明CSS/GPS源不仅可能处于射电活动的早期阶段，而且可能处于吸积活动的早期阶段。我们发现，当用σ [O III]作为恒星速度色散σ * 的替代时，年轻射电星系作为一类系统地偏离了由附近不活跃星系定义的MBH-σ * 关系。[Om]发射线宽度的偏差Δσ <$σ [OIII]-σ [pred]与喷流/吸积功率之间没有显著的相关性，其中σ [pred]是由特里梅因等人利用估算的BH质量关系计算的。然而，我们发现年轻射电星系的偏差Δσ与爱丁顿比有很好的相关性，这种相关性与射电宁静活动星系核（AGN）（QSO/NLS）的相关性相似，在那里射电喷流是不存在或很弱的。我们认为，吸积活动对这些年轻射电星系[O III]窄线运动学的形成仍起着重要作用。
The masses of the central supermassive black holes (BHs) and the Eddington ratios for a sample of 65 young radio galaxies [27 gigahertz-peaked spectrum (GPS) and 38 compact steep-spectrum (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 quasi-stellar objects (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 (NLSls). 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 ―σ * relation defined by nearby inactive galaxies, when using σ [O III as a surrogate for the stellar velocity dispersion σ * . There is no significant correlation between the deviation of the [O m] emission line width, Δσ ≡ σ [OIII] ― σ [pred] and the jet/accretion power, where σ [pred] are calculated from the Tremaine et al. relation using the estimated BH masses. However, we find that the deviation Δσ in young radio galaxies is well correlated with the Eddington ratio, and this correlation is found to be similar to that of radio quiet active galactic nuclei (AGN) (QSOs/NLSls) 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.