Deeper analysis of Fermi-LAT unassociated 4FGL J2112.5-3043 for possible identification
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| Format: | Preprint |
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2026
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| _version_ | 1866911598005714944 |
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| author | Giacchino, Federica Fernández-Suárez, Cristina Sánchez-Conde, Miguel Á Pérez-García, M. Ángeles Ciprini, Stefano Gasparrini, Dario |
| author_facet | Giacchino, Federica Fernández-Suárez, Cristina Sánchez-Conde, Miguel Á Pérez-García, M. Ángeles Ciprini, Stefano Gasparrini, Dario |
| contents | In the 4FGL-DR4 point-source catalog of the Large Area Telescope (LAT) onboard NASA's Fermi Gamma-ray Observatory (Fermi-LAT), around a third of the sources are still unidentified (unIDs). In this work, we perform a detailed study of one of them, namely 4FGL J2112.5-3043. Only gamma-ray emission has been detected from this unidentified source, with no counterpart observed at any other wavelength as of today. Together with its high detection significance, this makes 4FGL J2112.5-3043 a particularly compelling target for further investigation. The results of our spectral and spatial analyses show that the source photon spectrum is better described with a subexponential cutoff power-law spectral model, with no significant flux variability over time, and a morphology consistent with being a point-like source. We investigate and discuss the characterized emission within the context of both conventional and exotic astrophysics, namely a pulsar origin or potential dark matter (DM) annihilations in a nearby Galactic subhalo. Although our results are inconclusive and neither confirm a DM origin nor firmly establish an astrophysical nature, we find a spectral preference for the $b\bar{b}$ and $c\bar{c}$ DM annihilation channels over a pulsar origin, thus making this unID a particularly intriguing candidate for next multiwavelength observations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_14794 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Deeper analysis of Fermi-LAT unassociated 4FGL J2112.5-3043 for possible identification Giacchino, Federica Fernández-Suárez, Cristina Sánchez-Conde, Miguel Á Pérez-García, M. Ángeles Ciprini, Stefano Gasparrini, Dario High Energy Astrophysical Phenomena High Energy Physics - Experiment High Energy Physics - Phenomenology In the 4FGL-DR4 point-source catalog of the Large Area Telescope (LAT) onboard NASA's Fermi Gamma-ray Observatory (Fermi-LAT), around a third of the sources are still unidentified (unIDs). In this work, we perform a detailed study of one of them, namely 4FGL J2112.5-3043. Only gamma-ray emission has been detected from this unidentified source, with no counterpart observed at any other wavelength as of today. Together with its high detection significance, this makes 4FGL J2112.5-3043 a particularly compelling target for further investigation. The results of our spectral and spatial analyses show that the source photon spectrum is better described with a subexponential cutoff power-law spectral model, with no significant flux variability over time, and a morphology consistent with being a point-like source. We investigate and discuss the characterized emission within the context of both conventional and exotic astrophysics, namely a pulsar origin or potential dark matter (DM) annihilations in a nearby Galactic subhalo. Although our results are inconclusive and neither confirm a DM origin nor firmly establish an astrophysical nature, we find a spectral preference for the $b\bar{b}$ and $c\bar{c}$ DM annihilation channels over a pulsar origin, thus making this unID a particularly intriguing candidate for next multiwavelength observations. |
| title | Deeper analysis of Fermi-LAT unassociated 4FGL J2112.5-3043 for possible identification |
| topic | High Energy Astrophysical Phenomena High Energy Physics - Experiment High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.14794 |