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arXiv 1209.3501astro-ph.CO
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用SDSS观测的FIRST亮类星体的光谱变率

Spectral variability of FIRST bright QSOs with SDSS observations

Wei-Hao Bian, Li Zhang, Richard Green, Chen Hu

摘要:

对于某些样品,它已经表明,光谱的红移低的类星体是蓝色的,在其较亮的阶段。对于第一个明亮的类星体样本,我们从SDSS DR 7中收集了它们的光谱,以研究White等人(2000)和SDSS在长达10年的长休息帧时滞下光谱之间的变化。在这个样本中有312个射电强类星体和232个射电静类星体,最多可达$z \sim 3.5$。随着两历元的变化,发现有一半的类星体的光谱出现在其明亮的阶段红。射电静和射电响类星体子样的斜率变化没有明显的差异。这一结果意味着无线电喷流的存在并不影响10年时间尺度上的斜率变化。变质量类星体的算术合成差谱在$\sim$ 2500 nm处是陡峭的。2500 ° C的蓝向区域和2500 ° C的红向区域的变率不同。

英文摘要:

For some samples, it has been shown that spectra of QSOs with low redshift are bluer during their brighter phases. For the FIRST bright QSO sample, we assemble their spectra from SDSS DR7 to investigate variability between the spectra from White et al. (2000) and from the SDSS for a long rest-frame time-lag, up to 10 years. There are 312 radio loud QSOs and 232 radio quiet QSOs in this sample, up to $z \sim 3.5$. With two-epoch variation, it is found that spectra of half of the QSOs appear redder during their brighter phases. There is no obvious difference in slope variability between sub-samples of radio quiet and radio loud QSOs. This result implies that the presence of a radio jet does not affect the slope variability on 10-year timescales. The arithmetic composite difference spectrum for variable QSOs is steep at blueward of $\sim$ 2500Å. The variability for the region blueward of 2500 Å is different to that for the region redward of 2500 Å.

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