arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0708.0256astro-ph
收藏

窄线Seyfert 1 Galerkin和M_BH - sigma关系

Narrow-line Seyfert 1 Galaxies and the M_BH - sigma Relation

S. Komossa, D. Xu

摘要:

本文研究了窄线Seyfert 1(NLS 1)星系和宽线Seyfert 1(BLS 1)星系在非活动星系M_BH -σ关系上的位置。我们发现NLS 1星系作为一个类-以及我们的比较样本的BLS 1星系-不遵循非活动星系的M_BH-sigma关系,如果我们使用[SII] 6716,6731发射线的宽度作为恒星速度色散,sigma_* 的替代。我们还发现,[OIII]5007的宽度是sigma_* 的良好替代,但仅在(a)去除不对称蓝翼之后,并且更重要的是,在(b)排除具有强蓝移的核心[OIII]线之后(即,不包括星系的[OIII]速度场由径向运动主导,可能是流出)。在[OIII]中是极端异常值的同一星系在[SII]中仍然遵循M_BH - sigma关系.我们证实了以前的发现,NLS 1星系是系统地偏离M_BH -西格玛关系,如果完整的[OIII]配置文件被用来测量西格玛。本文系统地研究了[OIII]_core蓝移、L/L_Edd、强度比Fe_II/H_beta、NLR密度和绝对星等参数对NSL 1星系在M_BH - sigma平面上位置的影响。讨论了NLS 1模型及其沿M_BH - sigma关系演化的意义。

英文摘要:

We have studied the location of narrow-line Seyfert 1 (NLS1) galaxies and broad-line Seyfert 1 (BLS1) galaxies on the M_BH - sigma relation of non-active galaxies. We find that NLS1 galaxies as a class - as well as the BLS1 galaxies of our comparison sample - do follow the M_BH-sigma relation of non-active galaxies if we use the width of the [SII]6716,6731 emission lines as surrogate for stellar velocity dispersion, sigma_*. We also find that the width of [OIII]5007 is a good surrogate for sigma_*, but only after (a) removal of asymmetric blue wings, and, more important, after (b) excluding core [OIII] lines with strong blueshifts (i.e., excluding galaxies which have their [OIII] velocity fields dominated by radial motions, presumably outflows). The same galaxies which are extreme outliers in [OIII] still follow the M_BH - sigma relation in [SII]. We confirm previous findings that NLS1 galaxies are systematically off-set from the M_BH - sigma relation if the full [OIII] profile is used to measure sigma. We systematically investigate the influence of several parameters on the NSL1 galaxies' location on the M_BH - sigma plane: [OIII]_core blueshift, L/L_Edd, intensity ratio FeII/H_beta, NLR density, and absolute magnitude. Implications for NLS1 models and for their evolution along the M_BH - sigma relation are discussed.

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。

↑