Warped Accretion Disks and Quasars with Episodic Periodicity of Long-term Variations
It has been found from long-term monitoring campaigns that some quasars are undergoing quasiperiodic variations (most of them with damped amplitudes) in optical bands, but how to explain the origin of such light-curve variations still remains an open question. In this paper, we use the warped accret...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/ad9560 |
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| Summary: | It has been found from long-term monitoring campaigns that some quasars are undergoing quasiperiodic variations (most of them with damped amplitudes) in optical bands, but how to explain the origin of such light-curve variations still remains an open question. In this paper, we use the warped accretion disks model to explain the quasiperiodical variations. This model employs a free-bending wave traveling in an accretion disk, which causes the orientation of the central part of the disk to oscillate from the line of sight, resulting in a quasiperiodical variation. We numerically solve the governing equation of warp propagation and calculate the simulated R -band light curves, finding that the periodical light curves generated by this model have damped amplitudes. To compare with observations, we select SDSSJ134820.42+194831.5 as a preliminary example from a sample of periodic quasar candidates by combining CRTS with other public survey data and fitting its light curve with different observational angles. Our result gives a reduced χ ^2 ≃ 2.4, implying that the model might give insights into the future application of the warped disk model. |
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| ISSN: | 1538-4357 |