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Three new high-mass X-ray binaries in the Large Magellanic Cloud
Solar and Stellar Astrophysics · Submitted 1 Mar 2022
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We report the discovery of three new Be/X-ray binaries, two of them showing pulsations in their X-ray flux.
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The abstract, sentence by sentence
The Magellanic Clouds host a large population of high-mass X-ray binary (HMXB) systems, but although the Large Magellanic Cloud (LMC) is an order of magnitude more massive than the Small Magellanic Cloud, significantly fewer HMXBs are known. We conducted a search for new HMXBs in XMM-Newton observations, which we performed to investigate supernova remnant candidates in the supergiant shells LMC5 and LMC7. The three observed fields are located in regions, which were little explored in X-rays before. We analysed the XMM-Newton data to look for sources with hard X-ray spectrum and counterparts with optical colours and brightness typical for HMXBs. We report the discovery of three new Be/X-ray binaries, two of them showing pulsations in their X-ray flux. With a luminosity of 6.5e34 erg/s, XMMU J045315.1-693242 in LMC7 was relatively X-ray faint. The long-term OGLE I-band light curve of the V = 15.5 mag counterpart suggests a 49.6 day or 24.8 day orbital period for the binary system. XMMU J045736.9-692727, also located in LMC7 was brighter with a luminosity of 5.6e35 erg/s and hard spectrum with a power-law photon index of 0.63. The X-ray flux revealed clear pulsations with a period of 317.7 s. We obtained optical high resolution spectra from the V = 14.2 mag counterpart using the SALT-HRS spectrograph. Halpha and Hbeta were observed in emission with complex line profiles and equivalent widths of -8.0 A and -1.3 A, respectively. The I-band light curve obtained from OGLE shows a series of four strong outbursts followed by a sudden drop in brightness by more than 1 mag within 73-165 days and a recovery to the level before the outbursts. RX J0524.2-6620, previously classified as X-ray binary candidate, is located at the eastern part of LMC5. We report the discovery of 360.7 s pulsations. (abridged)
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The Magellanic Clouds host a large population of high-mass X-ray binary (HMXB) systems, but although the Large Magellanic Cloud (LMC) is an order of magnitude more massive than the Small Magellanic Cloud, significantly fewer HMXBs are known. | background 0.86 | 0.06 | 0.03 | asserted 1.00 |
| s1 | We conducted a search for new HMXBs in XMM-Newton observations, which we performed to investigate supernova remnant candidates in the supergiant shells LMC5 and LMC7. | method 0.81 | 0.95 | 0.03 | asserted 0.99 |
| s2 | The three observed fields are located in regions, which were little explored in X-rays before. | background 0.50 | 0.19 | 0.02 | asserted 1.00 |
| s3 | We analysed the XMM-Newton data to look for sources with hard X-ray spectrum and counterparts with optical colours and brightness typical for HMXBs. | method 0.99 | 0.94 | 0.03 | asserted 0.86 |
| s4 | We report the discovery of three new Be/X-ray binaries, two of them showing pulsations in their X-ray flux. | result 0.88 | 0.97 | 0.86 | asserted 1.00 |
| s5 | With a luminosity of 6.5e34 erg/s, XMMU J045315.1-693242 in LMC7 was relatively X-ray faint. | result 1.00 | 0.86 | 0.03 | asserted 1.00 |
| s6 | The long-term OGLE I-band light curve of the V = 15.5 mag counterpart suggests a 49.6 day or 24.8 day orbital period for the binary system. | result 1.00 | 0.71 | 0.04 | hedged possibility 1.00 |
| s7 | XMMU J045736.9-692727, also located in LMC7 was brighter with a luminosity of 5.6e35 erg/s and hard spectrum with a power-law photon index of 0.63. | result 1.00 | 0.90 | 0.05 | asserted 1.00 |
| s8 | The X-ray flux revealed clear pulsations with a period of 317.7 s. | result 1.00 | 0.90 | 0.05 | asserted 1.00 |
| s9 | We obtained optical high resolution spectra from the V = 14.2 mag counterpart using the SALT-HRS spectrograph. | method 0.99 | 0.96 | 0.02 | asserted 1.00 |
| s10 | Halpha and Hbeta were observed in emission with complex line profiles and equivalent widths of -8.0 A and -1.3 A, respectively. | result 1.00 | 0.88 | 0.02 | asserted 1.00 |
| s11 | The I-band light curve obtained from OGLE shows a series of four strong outbursts followed by a sudden drop in brightness by more than 1 mag within 73-165 days and a recovery to the level before the outbursts. | result 1.00 | 0.86 | 0.04 | asserted 1.00 |
| s12 | RX J0524.2-6620, previously classified as X-ray binary candidate, is located at the eastern part of LMC5. | background 0.39 | 0.20 | 0.03 | asserted 1.00 |
| s13 | We report the discovery of 360.7 s pulsations. (abridged) | result 0.98 | 0.89 | 0.15 | asserted 1.00 |
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Original abstract
The Magellanic Clouds host a large population of high-mass X-ray binary (HMXB) systems, but although the Large Magellanic Cloud (LMC) is an order of magnitude more massive than the Small Magellanic Cloud, significantly fewer HMXBs are known. We conducted a search for new HMXBs in XMM-Newton observations, which we performed to investigate supernova remnant candidates in the supergiant shells LMC5 and LMC7. The three observed fields are located in regions, which were little explored in X-rays before. We analysed the XMM-Newton data to look for sources with hard X-ray spectrum and counterparts with optical colours and brightness typical for HMXBs. We report the discovery of three new Be/X-ray binaries, two of them showing pulsations in their X-ray flux. With a luminosity of 6.5e34 erg/s, XMMU J045315.1-693242 in LMC7 was relatively X-ray faint. The long-term OGLE I-band light curve of the V = 15.5 mag counterpart suggests a 49.6 day or 24.8 day orbital period for the binary system. XMMU J045736.9-692727, also located in LMC7 was brighter with a luminosity of 5.6e35 erg/s and hard spectrum with a power-law photon index of 0.63. The X-ray flux revealed clear pulsations with a period of 317.7 s. We obtained optical high resolution spectra from the V = 14.2 mag counterpart using the SALT-HRS spectrograph. Halpha and Hbeta were observed in emission with complex line profiles and equivalent widths of -8.0 A and -1.3 A, respectively. The I-band light curve obtained from OGLE shows a series of four strong outbursts followed by a sudden drop in brightness by more than 1 mag within 73-165 days and a recovery to the level before the outbursts. RX J0524.2-6620, previously classified as X-ray binary candidate, is located at the eastern part of LMC5. We report the discovery of 360.7 s pulsations. (abridged)
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References
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3 arXiv papers cite this in 3 sentences
Papers citing it · 2 sentences without a confident label
Uses its data or values 1 paper
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Considering a distance to the source to be 50 kpc [ref] , the luminosity in the 0.5-79 keV energy range was computed to be $∼$ 7.9$×$10$^35$.
Spectral and Timing properties of the recently discovered Be/X-ray pulsar eRASSUJ 052914.9-662446 · Swift-XRT and NuSTAR simultaneous spectral fitting · 0.97
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