z > 0.8 窄线与宽线 Seyfert 1 星系长期光学光变特性比较分析
A comparative analysis of the long-term optical variability characteristics of narrow and broad-line Seyfert 1 galaxies at z > 0.8
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中文总结 AI 辅助
本研究比较了高红移窄线与宽线 Seyfert 1 星系的光变特性,发现窄线星系光变幅度更低,光变与波长相关且与爱丁顿比率反相关,趋势可能由吸积盘变化驱动。
中文摘要 AI 辅助
我们展示了高红移窄线 Seyfert 1(NLSy1)星系和宽线 Seyfert 1(BLSy1)星系长期光学光变特性比较分析的结果。我们的样本覆盖红移范围 $0.8 < z < 2.6$,包含在光学亮度$-$红移平面上匹配的 2490 个 NLSy1 星系和 2490 个 BLSy1 星系。我们使用了 Catalina 实时瞬变巡天覆盖 5$-$9 年基线的 V 波段数据,以及 Zwicky 瞬变设施覆盖 5 至 6 年的 g、r 和 i 波段数据。为了表征光变,我们估计了光变幅度($\sigma_m$)。我们发现 NLSy1 星系通常表现出比 BLSy1 星系更低的 $\sigma_m$。在 NLSy1 和 BLSy1 星系样本中,我们利用 Zwicky 瞬变设施的数据观测到波长依赖的光变,$\sigma_m$ 随波长变短逐渐增大。我们发现在 g、r 和 i 波段中,BLSy1 星系的 $\sigma_m$ 与爱丁顿比率之间存在反相关,而对于 NLSy1 星系,这种反相关仅在 r 和 i 波段中观测到。对于 NLSy1 和 BLSy1 星系,我们均未发现 g、r 和 i 波段的 $\sigma_m$ 与黑洞质量之间存在相关性。在两个样本中,我们发现约 90\\% 的源表现出越亮越蓝的趋势。在 BLSy1 和 NLSy1 星系中,我们均未发现 g 和 r 波段光变之间存在显著的时间延迟。我们高红移 BLSy1 和 NLSy1 星系样本中观测到的光学光变曲线长期趋势可能由吸积盘的变化驱动。
英文摘要
We present the results on a comparative analysis of the long-term optical variability characteristics of high-redshift narrow-line Seyfert 1 (NLSy1) galaxies and broad-line Seyfert 1 (BLSy1) galaxies. Our sample spanning the redshift range of $0.8 < z < 2.6$, comprises 2490 NLSy1 and 2490 BLSy1 galaxies matched in the optical brightness$-$redshift plane. We used V-band data from the Catalina Real-Time Transient Survey covering a baseline of 5$-$9 years, and g, r, and i-band data from the Zwicky Transient Facility spanning 5 to 6 years. To characterise variability we estimated the amplitude of variability ($σ_m$). We found that NLSy1 galaxies generally exhibit lower $σ_m$ compared to BLSy1 galaxies. In both the NLSy1 and BLSy1 galaxy samples, we observed a wavelength dependent variability using data from Zwicky Transient Facility, with $σ_m$ gradually increasing towards shorter wavelengths. We found an anti-correlation between $σ_m$ and Eddington ratio in the g, r, and i bands for BLSy1 galaxies, whereas this anti-correlation is observed only in the r and i bands for NLSy1 galaxies. For both NLSy1 and BLSy1 galaxies, we found no correlation between $σ_m$ in g, r, and i bands and black hole mass. In both the samples, we found that $\sim$90\% of the sources showed a bluer when brighter trend. We found no significant time lag between variations in g and r bands in both BLSy1 and NLSy1 galaxies. The observed long-term trends in the optical light curves of our high redshift sample of BLSy1 and NLSy1 galaxies could be driven by variations in the accretion disk.
发表机构
- Indian Institute of Astrophysics(印度天体物理研究所)
- Pondicherry University(本地治里大学)
- St. Joseph’s University(圣约瑟夫大学)
- Azim Premji University(阿齐姆·普雷姆吉大学)
- Aryabhatta Research Institute of Observational Sciences(阿里亚巴塔观测科学研究所)
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