| Name: | Dharmender Thakur |
| Affiliation: | Central University of Himachal Pradesh, Kangra, H.P. |
| Conference ID : | ASI2024_349 |
| Title : | On the correlation ZTF based power spectral density properties of Swift-BAT AGN sample with their spectral properties |
| Authors : | Dharmender, Vivek Kumar Jha, Hum chand |
| Authors Affiliation: | Dharmender, Hum chand Affiliation (Central University of Himachal Pradesh, India)
Vivek Kumar Jha Affiliation (Aryabhatta Research Institute of Observational Sciences: ARIES, Nainital, India) |
| Mode of Presentation: | Poster |
| Abstract Category : | Galaxies and Cosmology |
| Abstract : |
Optical variability provides a robust mechanism for investigating the environment of the central engine of Active Galactic Nuclei (AGN) which otherwise are unresolvable especially at high redshift. Here, we examine a sample of 152 Type-I AGNs (0.01 < z < 0.30) from the Burst Alert Telescope (BAT) AGN Spectroscopic Survey (BASS) with available spectral physical properties such as black hole mass, accretion rate, and bolometric luminosity. Using g-band and r-band light curves from the Zwicky Transient Facility (ZTF), spanning more than 5 years, we characterise the optical variability of this sample. Our analysis of the ZTF light curves, using the Lomb-Scargle periodogram, allows us to estimate the power spectral density (PSD). We model the PSD using a double power law to measure the lower (𝛼) and higher (𝛽) frequency slopes, along with the break frequency. Our findings reveal a significant correlation between 𝛽 and both black hole mass and bolometric luminosity. However, our sample indicates a weak, correlation between 𝛽 and the X-ray spectral slope implying that X-Ray and optical emission process in general may be uncorrelated. We will further discuss the implications of our findings within the framework of various accretion disc models for AGNs. |
