| Name: | Athira M Bharathan |
| Affiliation: | CHRIST (Deemed to be University) |
| Conference ID: | ASI2025_436 |
| Title: | Probing High-Energy Emission Mechanisms in Blazars through X-ray Polarization with IXPE |
| Authors: | 1: Athira M Bharathan Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, India.
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| Authors Affiliation: |
2: C S Stalin Indian Institute of Astrophysics, Block II, Koramangala, Bangalore 560 034 India.
3: Sunder Sahayanathan Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai-400085, India and Homi Bhabha National Institute, Mumbai-400094, India.
4: Blesson Mathew Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, India.
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| Mode of Presentation: | Oral |
| Abstract Category: | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract: | The spectral energy distribution (SED) of blazars typically exhibits a characteristic double-peak structure, with a low-energy peak from synchrotron radiation emitted by relativistic particles within the jet and a high-energy peak from inverse Compton scattering. In BL Lacertae (BLL) objects, the X-ray emission generally lies within the high-energy tail of the synchrotron component, whereas in Flat Spectrum Radio Quasars (FSRQs), it is situated in the low-energy segment of the inverse Compton component. These contrasting locations allow X-ray polarization measurements to provide insights into particle acceleration processes within the jets of these blazar types. In this study, we analyze observations of several blazars by NASA’s Imaging X-ray Polarimetry Explorer (IXPE), detecting significant polarization in Mrk 421, 1ES 1959+650, and PKS 2155-304, while no X-ray polarization was detected for 3C 454.3. Through polarization analysis, we explore the structure and properties of the high-energy emission regions and examine the differing polarization behaviors between FSRQ and BLL sources, shedding light on distinctions between leptonic and hadronic models of blazar emission. |
