Is the Fermi source 4FGL J1824.2+1231 a transitional millisecond pulsar?
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Zyuzin, D. A. Karpova, A. V. Kirichenko, A. Yu. Shibanov, Yu. A. Bikmaev, I. F. Gilfanov, M. R. Irtuganov, E. N. Gorbachev, M. A. Suslikov, M. V. Karimov, R. Veryazov, M. M. Pereyra, M. |
| author_facet | Zyuzin, D. A. Karpova, A. V. Kirichenko, A. Yu. Shibanov, Yu. A. Bikmaev, I. F. Gilfanov, M. R. Irtuganov, E. N. Gorbachev, M. A. Suslikov, M. V. Karimov, R. Veryazov, M. M. Pereyra, M. |
| contents | Transitional millisecond pulsars (tMSPs) in tight binary systems represent an important evolutionary link between low-mass X-ray binaries and radio millisecond pulsars. To date, only three confirmed tMSPs and a few candidates have been discovered. Most of them are gamma-ray sources. For this reason, searching for multiwavelength counterparts to unassociated Fermi gamma-ray sources can help to find new tMSPs. Here we investigate whether the unassociated gamma-ray source 4FGL J1824.2+1231 belongs to the tMSP family. To find the counterpart to 4FGL J1824.2+1231, we used data from SRG/eROSITA and Swift X-ray catalogues, and from different optical catalogues. We also performed time-series photometric optical observations of the source with the 2.1-m telescope of the Observatorio Astronomico Nacional San Pedro Martir, the 1.5-m telescope of the Maidanak Astronomical Observatory and the 1.5-m Russian-Turkish telescope. In addition, we carried out optical spectroscopic observations with the Russian-Turkish telescope and used archival spectroscopic data obtained with the Gemini-North telescope. Within the position error ellipse of 4FGL J1824.2+1231, we found only one X-ray source which coincides with an optical object. We consider it as a likely multiwavelength counterpart to 4FGL J1824.2+1231. The source shows strong optical variability and significant proper motion. The latter strongly implies that this is a Galactic source. Double-peaked H and He emission lines are detected in its spectrum with a flat continuum, as often observed in accretion disks of compact binary systems. The X-ray spectrum is well fitted by a power law with the photon index 1.7. The derived intrinsic X-ray-to-gamma-ray flux ratio is about 0.2. If the X-ray/optical source is the true counterpart to 4FGL J1824.2+1231, then all its properties suggest that it is a tMSP in the subluminous disk state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_21142 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Is the Fermi source 4FGL J1824.2+1231 a transitional millisecond pulsar? Zyuzin, D. A. Karpova, A. V. Kirichenko, A. Yu. Shibanov, Yu. A. Bikmaev, I. F. Gilfanov, M. R. Irtuganov, E. N. Gorbachev, M. A. Suslikov, M. V. Karimov, R. Veryazov, M. M. Pereyra, M. High Energy Astrophysical Phenomena Transitional millisecond pulsars (tMSPs) in tight binary systems represent an important evolutionary link between low-mass X-ray binaries and radio millisecond pulsars. To date, only three confirmed tMSPs and a few candidates have been discovered. Most of them are gamma-ray sources. For this reason, searching for multiwavelength counterparts to unassociated Fermi gamma-ray sources can help to find new tMSPs. Here we investigate whether the unassociated gamma-ray source 4FGL J1824.2+1231 belongs to the tMSP family. To find the counterpart to 4FGL J1824.2+1231, we used data from SRG/eROSITA and Swift X-ray catalogues, and from different optical catalogues. We also performed time-series photometric optical observations of the source with the 2.1-m telescope of the Observatorio Astronomico Nacional San Pedro Martir, the 1.5-m telescope of the Maidanak Astronomical Observatory and the 1.5-m Russian-Turkish telescope. In addition, we carried out optical spectroscopic observations with the Russian-Turkish telescope and used archival spectroscopic data obtained with the Gemini-North telescope. Within the position error ellipse of 4FGL J1824.2+1231, we found only one X-ray source which coincides with an optical object. We consider it as a likely multiwavelength counterpart to 4FGL J1824.2+1231. The source shows strong optical variability and significant proper motion. The latter strongly implies that this is a Galactic source. Double-peaked H and He emission lines are detected in its spectrum with a flat continuum, as often observed in accretion disks of compact binary systems. The X-ray spectrum is well fitted by a power law with the photon index 1.7. The derived intrinsic X-ray-to-gamma-ray flux ratio is about 0.2. If the X-ray/optical source is the true counterpart to 4FGL J1824.2+1231, then all its properties suggest that it is a tMSP in the subluminous disk state. |
| title | Is the Fermi source 4FGL J1824.2+1231 a transitional millisecond pulsar? |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2505.21142 |