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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.20351 |
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| _version_ | 1866918026298785792 |
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| author | Tramacere, Andrea Campana, Riccardo Massaro, Enrico Bocchino, Fabrizio Miceli, Marco Orlando, Salvatore |
| author_facet | Tramacere, Andrea Campana, Riccardo Massaro, Enrico Bocchino, Fabrizio Miceli, Marco Orlando, Salvatore |
| contents | A search for $γ$-ray emission from SNRs in the Large Magellanic Cloud (LMC) based on the detection of concentrations in the arrival direction Fermi-LAT images of photons at energies higher than 10 GeV found significant evidence for 9 of these sources. This analysis was based on data collected in the time window since August 4 2008 to August, 4 2020 (12 years). In the present contribution, we report results of a new search extended using a 15-year long (up to August, 4 2023) data set and to a broad energy range (higher than 4 GeV). The longer baseline and the softer energy lower limit are required to further understand the relation between the X-ray and gamma ray SNRs in the LMC, and to investigate the completness of the sample at low luminosities. Two different methods of clustering analysis were applied: Minimum Spanning Tree (MST), and the combination of Density-Based Spatial Clustering of Applications with Noise (DBSCAN) and DENsity-based CLUstEring (DENCLUE) algorithms. We confirm all previous detections and found positive indications for at least 8 new clusters with a spatial correspondence with other SNRs, increasing thus the number of remnants in LMC candidate or detected in the high energy $γ$-rays to 16 sources. This study extends previous analyses of $γ$-ray emission from SNRs in the LMC by incorporating a longer observational baseline and a broader energy range. The improved dataset and advanced clustering techniques enhance our understanding of the connection between X-ray and $γ$-ray SNRs, providing new insights into their high-energy properties, and contributing to assessing the completeness of the sample at lower luminosities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_20351 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for $γ$-ray emission from SNRs in the Large Magellanic Cloud: a new cluster analysis at energies above 4 GeV Tramacere, Andrea Campana, Riccardo Massaro, Enrico Bocchino, Fabrizio Miceli, Marco Orlando, Salvatore High Energy Astrophysical Phenomena A search for $γ$-ray emission from SNRs in the Large Magellanic Cloud (LMC) based on the detection of concentrations in the arrival direction Fermi-LAT images of photons at energies higher than 10 GeV found significant evidence for 9 of these sources. This analysis was based on data collected in the time window since August 4 2008 to August, 4 2020 (12 years). In the present contribution, we report results of a new search extended using a 15-year long (up to August, 4 2023) data set and to a broad energy range (higher than 4 GeV). The longer baseline and the softer energy lower limit are required to further understand the relation between the X-ray and gamma ray SNRs in the LMC, and to investigate the completness of the sample at low luminosities. Two different methods of clustering analysis were applied: Minimum Spanning Tree (MST), and the combination of Density-Based Spatial Clustering of Applications with Noise (DBSCAN) and DENsity-based CLUstEring (DENCLUE) algorithms. We confirm all previous detections and found positive indications for at least 8 new clusters with a spatial correspondence with other SNRs, increasing thus the number of remnants in LMC candidate or detected in the high energy $γ$-rays to 16 sources. This study extends previous analyses of $γ$-ray emission from SNRs in the LMC by incorporating a longer observational baseline and a broader energy range. The improved dataset and advanced clustering techniques enhance our understanding of the connection between X-ray and $γ$-ray SNRs, providing new insights into their high-energy properties, and contributing to assessing the completeness of the sample at lower luminosities. |
| title | Search for $γ$-ray emission from SNRs in the Large Magellanic Cloud: a new cluster analysis at energies above 4 GeV |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2503.20351 |