arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1305.0263astro-ph.CO
收藏

24,264个光学选择的AGN的窄线区域气体运动学:无线电连接

Narrow-line region gas kinematics of 24,264 optically-selected AGN: the radio connection

J. R. Mullaney, D. M. Alexander, S. Fine, A. D. Goulding, C. M. Harrison, R. C. Hickox

摘要:

使用24264个从SDSS DR 7数据库中光学选择的活动星系核的样本,我们研究了[OIII]发射线的轮廓与热光度(L_Bol),爱丁顿比,射电响度,射电光度(L_Rad)和光学类(Sy 1/2)的关系,以确定是什么驱动了这kpc尺度线发射气体的运动学。光谱叠加是用来说明如何平均[OIII]配置文件的变化作为这些变量的函数。在考虑了L_Bol和L_Rad之间的相关性之后,我们报告L_Rad对[OIII]轮廓的影响最大,中等射电光度AGN(log(L_Rad)=23-25 W/Hz)具有最宽的[OIII]轮廓。当根据爱丁顿比进行分组时,只有在我们最高的分组中的活动星系核(即,R_Edd>0.3)显示出任何扩大[OIII]轮廓的迹象,尽管这种极端AGN的数量很少意味着我们不能排除其他过程(例如,射电喷流)负责这种加宽。我们发现[OIII]配置文件的宽和窄线塞弗特1之间没有显着差异。Sy 1和2活动星系核的[OIII]剖面在线宽方面表现出相同的趋势,但Sy 1活动星系核显示出更强的蓝翼,我们将其解释为外流电离气体的证据。利用多分量线拟合方法计算了具有宽[OIII]谱线的活动星系核的比例,发现中等射电光度活动星系核具有极宽[OIII]谱线(FWHM> 1000 km/s)的可能性大约是低射电光度活动星系核的5倍。我们的结果与致密射电核心(而不是强大的射电喷流)引起的最受干扰的气体运动学是一致的,尽管在低L_Rad系统(<10^23 W/Hz)中也存在加宽的[OIII]线,但更为罕见。我们的多组份配合目录可作为在线资源免费提供。

英文摘要:

Using a sample of 24264 optically selected AGNs from the SDSS DR7 database, we characterise how the profile of the [OIII] emission line relates to bolometric luminosity (L_Bol), Eddington ratio, radio loudness, radio luminosity (L_Rad) and optical class (Sy 1/2) to determine what drives the kinematics of this kpc-scale line emitting gas. Spectral stacking is used to characterise how the average [OIII] profile changes as a function of these variables. After accounting for the correlation between L_Bol and L_Rad, we report that L_Rad has the strongest influence on the [OIII] profile, with moderate radio luminosity AGNs (log(L_Rad)=23-25 W/Hz) having the broadest [OIII] profiles. When binned according to Eddington ratio, only AGNs in our highest bin (i.e., R_Edd>0.3) show any signs of having broadened [OIII] profiles, although the small numbers of such extreme AGNs mean we cannot rule out that other processes (e.g., radio jets) are responsible for this broadening. We find no significant difference between the [OIII] profiles of broad and narrow-line Seyfert 1s. The [OIII] profiles of Sy 1 and 2 AGNs show the same trends in terms of line width, but Sy 1 AGNs display a much stronger blue wing, which we interpret as evidence of outflowing ionised gas. Using multi-component line fitting we calculate the proportions of AGNs with broad [OIII] profiles, finding that moderate radio luminosity AGNs are roughly 5 times more likely to have extremely broad [OIII] lines (FWHM>1000km/s) compared to lower L_Rad AGNs. Our results are consistent with the most disturbed gas kinematics being induced by compact radio cores (rather than powerful radio jets), although broadened [OIII] lines are also present, but much rarer, in low L_Rad systems (<10^23 W/Hz). Our catalogue of multi-component fits is freely available as an online resource.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑