Models of ultraluminous X-ray sources with intermediate-mass black holes
We have computed models for ultraluminous X-ray sources ( ULXs) consisting of a black hole accretor of intermediate mass (IMBH; e.g., ~1000 M⊙) and a captured donor star. For each of four different sets of initial donor masses and orbital separations we computed 30,000 binaryevolution models using a...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
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American Astronomical Society
2006
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| _version_ | 1797083826274435072 |
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| author | Madhusudhan, N Justham, S Nelson, L Paxton, B Pfahl, E Podsiadlowski, P Rappaport, S |
| author_facet | Madhusudhan, N Justham, S Nelson, L Paxton, B Pfahl, E Podsiadlowski, P Rappaport, S |
| author_sort | Madhusudhan, N |
| collection | OXFORD |
| description | We have computed models for ultraluminous X-ray sources ( ULXs) consisting of a black hole accretor of intermediate mass (IMBH; e.g., ~1000 M⊙) and a captured donor star. For each of four different sets of initial donor masses and orbital separations we computed 30,000 binaryevolution models using a full Henyey stellar evolution code. To our knowledge, this is the first time that a population of X-ray binaries this large has been carried out with other than approximation methods, and it serves to demonstrate the feasibility of this approach to large-scale population studies of mass transfer binaries. In the present study, we find that in order to have a plausible efficiency for producing active ULX systems with IMBHs having luminosities ≳10^40 ergs s^-1, there are two basic requirements for the capture of companion/donor stars. First, the donor stars should be massive, i.e., ≳8M⊙. Second, the initial orbital separations after circularization should be close, i.e., ≲6–30 times the radius of the donor star when on the main sequence. Even under these optimistic conditions, we show that the production rate of IMBH-ULX systems may fall short of the observed values by factors of 10–100. |
| first_indexed | 2024-03-07T01:46:57Z |
| format | Journal article |
| id | oxford-uuid:98bb4ce7-7825-464e-9220-ad4256240e40 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:46:57Z |
| publishDate | 2006 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | oxford-uuid:98bb4ce7-7825-464e-9220-ad4256240e402022-03-27T00:09:07ZModels of ultraluminous X-ray sources with intermediate-mass black holesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:98bb4ce7-7825-464e-9220-ad4256240e40black hole physicsgalaxies: star clustersaccretion, accretion disksX-rays: binariesSymplectic Elements at OxfordAmerican Astronomical Society2006Madhusudhan, NJustham, SNelson, LPaxton, BPfahl, EPodsiadlowski, PRappaport, SWe have computed models for ultraluminous X-ray sources ( ULXs) consisting of a black hole accretor of intermediate mass (IMBH; e.g., ~1000 M⊙) and a captured donor star. For each of four different sets of initial donor masses and orbital separations we computed 30,000 binaryevolution models using a full Henyey stellar evolution code. To our knowledge, this is the first time that a population of X-ray binaries this large has been carried out with other than approximation methods, and it serves to demonstrate the feasibility of this approach to large-scale population studies of mass transfer binaries. In the present study, we find that in order to have a plausible efficiency for producing active ULX systems with IMBHs having luminosities ≳10^40 ergs s^-1, there are two basic requirements for the capture of companion/donor stars. First, the donor stars should be massive, i.e., ≳8M⊙. Second, the initial orbital separations after circularization should be close, i.e., ≲6–30 times the radius of the donor star when on the main sequence. Even under these optimistic conditions, we show that the production rate of IMBH-ULX systems may fall short of the observed values by factors of 10–100. |
| spellingShingle | black hole physics galaxies: star clusters accretion, accretion disks X-rays: binaries Madhusudhan, N Justham, S Nelson, L Paxton, B Pfahl, E Podsiadlowski, P Rappaport, S Models of ultraluminous X-ray sources with intermediate-mass black holes |
| title | Models of ultraluminous X-ray sources with intermediate-mass black holes |
| title_full | Models of ultraluminous X-ray sources with intermediate-mass black holes |
| title_fullStr | Models of ultraluminous X-ray sources with intermediate-mass black holes |
| title_full_unstemmed | Models of ultraluminous X-ray sources with intermediate-mass black holes |
| title_short | Models of ultraluminous X-ray sources with intermediate-mass black holes |
| title_sort | models of ultraluminous x ray sources with intermediate mass black holes |
| topic | black hole physics galaxies: star clusters accretion, accretion disks X-rays: binaries |
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