1 Ocak 2023 Dergi makalesi Açık Erişim

Avdan, H.; Sonbas, E.; Dhuga, K. S.; Vinokurov, A.; Goegues, E.; Avdan, S.; Solovyeva, Y. N.; Kostenkov, A. E.; Shablovinskaya, E. S.; Goktas, D.

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        "affiliation": "Adiyaman Univ, Dept Phys, TR-02040 Adiyaman, Turkiye", 
        "name": "Avdan, H."
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      {
        "name": "Sonbas, E."
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      {
        "affiliation": "George Washington Univ, Dept Phys, Washington, DC 20052 USA", 
        "name": "Dhuga, K. S."
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      {
        "affiliation": "Special Astrophys Observ Russian AS, Nizhnii Arkhyz, Russia", 
        "name": "Vinokurov, A."
      }, 
      {
        "affiliation": "Sabanci Univ, Fac Engn & Nat Sci, Istanbul, Turkiye", 
        "name": "Goegues, E."
      }, 
      {
        "affiliation": "Adiyaman Univ, Dept Phys, TR-02040 Adiyaman, Turkiye", 
        "name": "Avdan, S."
      }, 
      {
        "affiliation": "Special Astrophys Observ Russian AS, Nizhnii Arkhyz, Russia", 
        "name": "Solovyeva, Y. N."
      }, 
      {
        "affiliation": "Special Astrophys Observ Russian AS, Nizhnii Arkhyz, Russia", 
        "name": "Kostenkov, A. E."
      }, 
      {
        "affiliation": "Special Astrophys Observ Russian AS, Nizhnii Arkhyz, Russia", 
        "name": "Shablovinskaya, E. S."
      }, 
      {
        "affiliation": "Adiyaman Univ, Dept Phys, TR-02040 Adiyaman, Turkiye", 
        "name": "Goktas, D."
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    "description": "<p>Archival XMM-Newton, Chandra, and Hubble Space Telescope(HST) data have been used to study the X-ray and optical properties of two candidate ultraluminous X-ray sources in NGC 4536. In order to search for potential optical counterparts, relative astrometry between Chandra and HST was improved, and as a result, optical counterparts were detected for both X-ray sources. To complement our findings (based on the archival data), ground-based optical spectra of the counterparts were obtained with the 6-m BTA (Big Telescope Alt-azimuth) Telescope located at the Special Astrophysical Observatory. The calculated redshift (z = 0.4391 +/- 0.0010) for one of the sources (X-3) indicates that the source is, in fact, a background active galactic nucleus. Two possible optical counterparts (s1 and s2) were found for X-2. Whether s1 is point-like or an extended source is unclear: If it is point-like and the emission is dominated by the donor, its spectral type indicates O-B star. The second source (s2) is point-like and is consistent with the colours and absolute magnitudes of a red supergiant.</p>", 
    "doi": "10.1093/mnras/stad879", 
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    "journal": {
      "issue": "4", 
      "pages": "10", 
      "title": "MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY", 
      "volume": "521"
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    "publication_date": "2023-01-01", 
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      "title": "Dergi makalesi", 
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    "science_branches": [
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    "title": "Optical counterparts of two candidate ultraluminous X-ray sources in NGC 4536"
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