Solid Identification of Extragalactic Gamma-Ray Source Using High-Resolution Radio Interferometric Observation
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917946210648064 |
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| author | Gabányi, K. É. Frey, S. Perger, K. Kun, E. |
| author_facet | Gabányi, K. É. Frey, S. Perger, K. Kun, E. |
| contents | The dominant fraction of the extragalactic $γ$-ray sources are blazars, active galactic nuclei with jets inclined at a small angle to the line of sight. Apart from blazars, a few dozen narrow-line Seyfert 1 galaxies (NLS1) and a number of radio galaxies are associated with $γ$-ray sources. The identification of $γ$-ray sources requires multiwavelength follow-up observations since several candidates could reside within the relatively large $γ$-ray localisation area. The $γ$-ray source 4FGL 0959.6+4606 was originally associated with a radio galaxy. However, follow-up multiwavelength work suggested a nearby NLS1 as the more probable origin of the $γ$-ray emission. We performed high-resolution very long baseline interferometry (VLBI) observation at 5 GHz of both proposed counterparts of 4FGL 0959.6+4606. We clearly detected the NLS1 source SDSS J095909.51+460014.3 with relativistically boosted jet emission. On the other hand, we did not detect milliarcsecond-scale compact emission in the radio galaxy 2MASX J09591976+4603515. Our VLBI imaging results suggest that the NLS1 object is the origin of the $γ$-ray emission in 4FGL 0959.6+4606. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_19858 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Solid Identification of Extragalactic Gamma-Ray Source Using High-Resolution Radio Interferometric Observation Gabányi, K. É. Frey, S. Perger, K. Kun, E. High Energy Astrophysical Phenomena Astrophysics of Galaxies The dominant fraction of the extragalactic $γ$-ray sources are blazars, active galactic nuclei with jets inclined at a small angle to the line of sight. Apart from blazars, a few dozen narrow-line Seyfert 1 galaxies (NLS1) and a number of radio galaxies are associated with $γ$-ray sources. The identification of $γ$-ray sources requires multiwavelength follow-up observations since several candidates could reside within the relatively large $γ$-ray localisation area. The $γ$-ray source 4FGL 0959.6+4606 was originally associated with a radio galaxy. However, follow-up multiwavelength work suggested a nearby NLS1 as the more probable origin of the $γ$-ray emission. We performed high-resolution very long baseline interferometry (VLBI) observation at 5 GHz of both proposed counterparts of 4FGL 0959.6+4606. We clearly detected the NLS1 source SDSS J095909.51+460014.3 with relativistically boosted jet emission. On the other hand, we did not detect milliarcsecond-scale compact emission in the radio galaxy 2MASX J09591976+4603515. Our VLBI imaging results suggest that the NLS1 object is the origin of the $γ$-ray emission in 4FGL 0959.6+4606. |
| title | Solid Identification of Extragalactic Gamma-Ray Source Using High-Resolution Radio Interferometric Observation |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.19858 |