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arXiv 1609.09489astro-ph.GA
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根据SDSS宽带测光和单历元光谱估算280,000活动星系核的维里黑洞质量

Virial Black Hole Mass Estimates for 280,000 AGNs from the SDSS Broad-Band Photometry and Single Epoch Spectra

Szymon Kozłowski

摘要:

我们使用斯隆数字巡天(SDSS)的类星体数据Release 12(DR 12 Q),包含近300,000个活动星系核,计算5100度、3000度和1350度的单色光度,这些光度是由宽波段消隐校正的SDSS星等得出的。在将它们与基于光谱的对应物进行匹配并发表在SDSS类星体数据发布7(DR 7 Q)中之后,我们发现在2.5 dex的光度范围内,它们与分钟平均偏移($\sim$ 0.01 dex)和0.11,0.10,0.12 dex的差异分散度之间存在完美的相关性。然后,我们估计活动星系核(AGN)的黑洞质量使用宽线区半径-光度关系和半高宽的MgII和CIV发射线,提供了一个目录的283,032维里黑洞质量估计(MgII为132,451,CIV为213,068,487)以及$0.1<z<5.5$和SDSS覆盖的大约四分之一天空的热光度和爱丁顿比估计。从Mg II得到的黑洞质量估计结果与DR 7 Q得到的结果非常匹配,在$\sim$ 2 dex BH质量范围内,差异的分散度为0.34 dex。我们发现,与DR 7 Q相比,从DR 12 Q推导出的CIV FWHM存在偏倚,我们根据经验进行了纠正。应该谨慎使用CIV BH质量估计,因为已知CIV线会在单历元光谱的BH质量估计中引起问题。最后,经过FWHM修正后,CIV估算的活动星系核黑洞质量与DR 7 Q估算的质量非常接近(色散为0.28 dex),更重要的是,MgII和CIV BH质量内部一致,平均偏移为0.07 dex,色散为0.39 dex。

英文摘要:

We use the Sloan Digital Sky Survey (SDSS) Quasar Data Release 12 (DR12Q), containing nearly 300,000 AGNs, to calculate the monochromatic luminosities at 5100Å, 3000Å, and 1350Å, derived from the broad-band extinction-corrected SDSS magnitudes. After matching them to their counterparts based on spectra and published in the SDSS Quasar Data Release 7 (DR7Q), we find perfect correlations with minute mean offsets ($\sim$0.01 dex) and dispersions of differences of 0.11, 0.10, 0.12 dex, respectively, across a 2.5 dex luminosity range. We then estimate the active galactic nuclei (AGNs) black hole masses using the broad line region radius--luminosity relations and the FWHM of the MgII and CIV emission lines, to provide a catalog of 283,032 virial black hole mass estimates (132,451 for MgII, 213,068 for CIV, and 62,487 for both) along with the bolometric luminosity and the Eddington ratio estimates for $0.1<z<5.5$ and for roughly a quarter of the sky covered by SDSS. The black hole mass estimates from MgII turned out to be closely matched to the ones from DR7Q with the dispersion of differences of 0.34 dex across a $\sim$2 dex BH mass range. We uncovered a bias in the derived CIV FWHMs from DR12Q as compared to DR7Q, that we correct empirically. The CIV BH mass estimates should be used with caution because the CIV line is known to cause problems in the BH mass estimation from single-epoch spectra. Finally, after the FWHM correction, the AGN black hole mass estimates from CIV closely match the DR7Q ones (with the dispersion of 0.28 dex), and more importantly the MgII and CIV BH masses agree internally with the mean offset of 0.07 dex and the dispersion of 0.39 dex.

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