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http://hdl.handle.net/2289/8339| Title: | Multiple Emission Regions in Jets of the Low-Luminosity Active Galactic Nucleus in NGC 4278 |
| Authors: | Dutta, Samik Gupta, Nayantara |
| Issue Date: | 4-Oct-2024 |
| Publisher: | IOP Publishing Ltd. |
| Citation: | The Astrophysical Journal, 2024, Vol. 974, p56 |
| 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. |
| Description: | Open Access |
| URI: | http://hdl.handle.net/2289/8339 |
| Alternative Location: | https://ui.adsabs.harvard.edu/abs/2024ApJ...974...56D/abstract https://arxiv.org/abs/2405.15657 http://dx.doi.org/10.3847/1538-4357/ad6d65 https://inspirehep.net/literature/2790050 |
| Copyright: | 2024 IOP Publishing Ltd |
| Appears in Collections: | Research Papers (A&A) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2024_ApJ_974_56.pdf | Open Access | 722.6 kB | Adobe PDF | View/Open |
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