Broadband study of the SMC pulsar RX J0032.9-7348 during its X-ray brightening in 2024
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arXiv
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| Format: | Preprint |
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2025
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| author | Chhotaray, Birendra Jaisawal, Gaurava K. Naik, Sachindra Jana, Arghajit |
| author_facet | Chhotaray, Birendra Jaisawal, Gaurava K. Naik, Sachindra Jana, Arghajit |
| contents | We present the results of the broadband timing and spectral analysis of the poorly understood SMC pulsar RX J0032.9-7348 (= SXP 7.02) using NuSTAR and NICER observations during its X-ray brightening in 2024. Our timing analysis revealed a pulsation period of approximately 7.02 s in the X-ray light curve. The pulse profile obtained in the broad energy range is double-peaked and asymmetric in nature and shows moderate variation with the energy. An absorbed power-law model describes the 0.5-8 keV NICER spectra well. The 3-50 keV NuSTAR spectrum is best described with an absorbed power-law modified with a high-energy cutoff model. We find no evidence of iron or cyclotron line features in the energy spectrum. During our observation period, the 0.5-50 keV luminosity varies in the range of $\sim 8\times10^{36} - 4\times10^{37}$ erg s$^{-1}$. We also discuss the dependence of spectral parameters on the rotational phase of the pulsar through phase-resolved spectroscopy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_21671 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Broadband study of the SMC pulsar RX J0032.9-7348 during its X-ray brightening in 2024 Chhotaray, Birendra Jaisawal, Gaurava K. Naik, Sachindra Jana, Arghajit High Energy Astrophysical Phenomena We present the results of the broadband timing and spectral analysis of the poorly understood SMC pulsar RX J0032.9-7348 (= SXP 7.02) using NuSTAR and NICER observations during its X-ray brightening in 2024. Our timing analysis revealed a pulsation period of approximately 7.02 s in the X-ray light curve. The pulse profile obtained in the broad energy range is double-peaked and asymmetric in nature and shows moderate variation with the energy. An absorbed power-law model describes the 0.5-8 keV NICER spectra well. The 3-50 keV NuSTAR spectrum is best described with an absorbed power-law modified with a high-energy cutoff model. We find no evidence of iron or cyclotron line features in the energy spectrum. During our observation period, the 0.5-50 keV luminosity varies in the range of $\sim 8\times10^{36} - 4\times10^{37}$ erg s$^{-1}$. We also discuss the dependence of spectral parameters on the rotational phase of the pulsar through phase-resolved spectroscopy. |
| title | Broadband study of the SMC pulsar RX J0032.9-7348 during its X-ray brightening in 2024 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.21671 |