1 Ocak 2022 Dergi makalesi Açık Erişim

Allak, S.; Akyuz, A.; Oralhan, I. Akkaya; Avdan, S.; Aksaker, N.; Vinokurov, A.; Soydugan, F.; Sonbas, E.; Dhuga, K. S.

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      {
        "name": "Allak, S."
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      {
        "name": "Akyuz, A."
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      {
        "affiliation": "Erciyes Univ, Dept Astron & Space Sci, TR-38039 Kayseri, Turkey", 
        "name": "Oralhan, I. Akkaya"
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      {
        "affiliation": "Univ Cukurova, Space Sci & Solar Energy Res & Applicat Ctr UZAYM, TR-01330 Adana, Turkey", 
        "name": "Avdan, S."
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      {
        "name": "Aksaker, N."
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      {
        "affiliation": "Special Astrophys Observ Russian AS, Nizhnii Arkhyz 399167, Russia", 
        "name": "Vinokurov, A."
      }, 
      {
        "name": "Soydugan, F."
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      {
        "name": "Sonbas, E."
      }, 
      {
        "affiliation": "George Washington Univ, Dept Phys, Washington, DC 20052 USA", 
        "name": "Dhuga, K. S."
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    "description": "We present the results of a temporal and spectral analysis of the transient source ULX-4 in the galaxy M51. The data used were drawn from Chandra, XMM-Newton, and Swift-XRT archives, spanning the years 2000-2019.. The X-ray flux of the source is seen to vary by two orders of magnitudes within a month but a short-term variability was not observed over the time intervals of 100-2000 s in the 0.3-10 keV energy band. We find some evidence for the existence of bi-modality feature in the flux distribution of ULX-4. We identified two optical sources as possible counterparts within an error radius of 0.'' 18 at 95 per cent confidence level for ULX-4 based on the archival Hubble Space Telescope (HST)/ACS and HST/WFC3 data. Blackbody fits of the spectral energy distributions (SEDs) indicate the spectral type to be B-type stars. One of these counterparts exhibits a low-amplitude optical periodicity of 264 +/- 37 d in the F606W filter; if we assume this apparent periodicity is associated with the orbital motion of the donor, then it is more likely that the donor is a red supergiant satisfying the long periodicity and accretion via Roche lobe overflow. Consequently, the SED would then have to be interpreted as a superposition of emissions from a cold donor and a hot flow component, most likely from an accretion disc. If, on the other hand, the periodicity is superorbital in nature i.e. due to possible interactions of the compact object with a circumstellar disc, the donor could then be a Be/X star hosting a neutron star.", 
    "doi": "10.1093/mnras/stab3693", 
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    "journal": {
      "issue": "3", 
      "pages": "4355-4369", 
      "title": "MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY", 
      "volume": "510"
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    "publication_date": "2022-01-01", 
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      "title": "Dergi makalesi", 
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    "science_branches": [
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    "title": "The transient ultraluminous X-ray source, ULX-4, in M51"
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