| Name: Anurag Koparkar |
| Affiliation: Indian Institute of Science Education and Research, Berhampur |
| Conference ID: ASI2026_689 |
| Title: Spectral-Polarisation Correlation In Blazars |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Anurag Koparkar(IISER Berhampur), Dr. Pankaj Kushwaha(IISER Mohali) |
| Abstract: Blazars are a subclass of AGN whose relativistic jets are pointed closely to our line of sight. Their spectral energy distribution (SED) shows a unique double hump structure, in which the first hump is due to non-thermal synchrotron radiation. Since synchrotron radiation is polarised, a direct correlation is expected between the spectral and polarization properties in the optical and near-infrared energy range. We investigate this correlation using multi-band (B, V, R, J, K) photometry data from SMARTS Observatory and photo-polarimetric data from Steward Observatory. By comparatively fitting models to SED, we derive spectral parameters that are used to estimate polarization degrees and their evolution over time. A total of eight blazars were identified as common to both observatories, which include both subclasses of blazars, Flat Spectrum Radio Quasars (FSRQs) and BL Lacertae (BL Lac) objects. This sample covers a broad range of spectral and physical characteristics. Our study aims to investigate whether this correlation differs across different classes of blazars. By analysing both flaring and quiescent states, we aim to understand how temporal variability shifts a source along the blazar sequence and how changes in the synchrotron peak influence polarization behaviour. By performing class-wise statistical comparisons and spectral-polarimetric correlation analysis our study aims to answer the dominant physical processes that govern emission in relativistic jets. I will present and discuss preliminary results from this study. |
