| Name: | Samik Dutta |
| Affiliation: | Birla Institute of Technology and Science - Pilani |
| Conference ID: | ASI2025_49 |
| Title: | Multiple Emission Regions in Jets of the Low-Luminosity Active Galactic Nucleus in NGC 4278 |
| Authors: | Samik Dutta 1, 2, Nayantara Gupta 3 |
| Authors Affiliation: | 1 Samik Dutta University of Calcutta, 92 Acharya Prafulla Chandra Road, Rajabazar, Kolkata, West Bengal 700009, India
2 Samik Dutta Birla Institute of Technology and Science—Pilani, Vidya Vihar, Pilani, Rajasthan 333031, India
3 Nayantara Gupta Raman Research Institute, C. V. Raman Avenue, 5th Cross Road, Sadashivanagar, Bengaluru, Karnataka 560080, India |
| Mode of Presentation: | Poster |
| Abstract Category: | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract: | The Large High Altitude Air Shower Observatory (LHAASO) has detected very-high-energy gamma rays from the low-ionization nuclear emission-line region galaxy NGC 4278, which has a low-luminosity active galactic nucleus (LLAGN) and symmetric, mildly relativistic S-shaped twin jets detected by radio observations. Few LLAGNs have been detected in gamma rays due to their faintness. Earlier, several radio-emitting components were detected in the jets of NGC 4278. We model their radio emission with synchrotron emission of ultra-relativistic electrons to estimate the strength of the magnetic field inside these components within a time-dependent framework after including the ages of the different components. We show that the synchrotron and synchrotron self-Compton emission by these components cannot explain the Swift X-ray data and the LHAASO gamma-ray data from NGC 4278. We suggest that a separate component in one of the jets is responsible for the high-energy emission, whose age, size, magnetic field, and the spectrum of the ultra-relativistic electrons inside it have been estimated after fitting the multiwavelength data of NGC 4278 with the sum of the spectral energy distributions from the radio components and the high-energy component. We note that the radio components of NGC 4278 are larger than the high-energy component, which has also been observed in several high-luminosity active galactic nuclei. |
