Modelling optical emission of Ultra-luminous X-ray Sources accreting above the Eddington limit

Abstract

We study the evolution of binary systems of Ultra-luminous X-ray sources and compute their optical emission assuming accretion onto a black hole via a non standard, advection-dominated slim disc with an outflow. We consider systems with black holes of $20M_{\odot }$ and $100M_{\odot }$, and donor masses between $8M_{\odot }$ and $25M_{\odot }$. Super-critical accretion has considerable effects on the optical emission. The irradiating flux in presence of an outflow remains considerably stronger than that produced by a standard disc. However, at very high accretion rates the contribution of X-ray irradiation becomes progressively less important in comparison with the intrinsic flux emitted from the disc. After Main Sequence the evolutionary tracks of the optical counterpart on the colour-magnitude diagram are markely different from those computed for Eddington-limited accretion. Systems with stellar-mass black holes and $12-20M_{\odot }$ donors accreting supercritically are characterized by blue colors (F450W -- F555W $\simeq -0.2:+0.1$) and high luminosity ($M_V\simeq -4:-6.5$). Systems with more massive black holes accreting supercritically from evolved donors of similar mass have comparable colours but can reach $M_V\simeq -8$. We apply our model to NGC 1313 X-2 and NGC 4559 X-7. Both sources are well represented by a system accreting above Eddington from a massive evolved donor. For NGC 1313 X-2 the agreement is for a $\sim 20M_{\odot }$ black hole, while NGC4559 X-7 requires a significantly more massive black hole.

arXiv comment13 pages, 15 figures, Accepted for publication in MNRAS; Acknowledgments added

References in corpus (35)

• The Photometric Performance and Calibration of the HST Advanced Camera For Surveys
• An Ultraluminous X-ray Source Powered by An Accreting Neutron Star
• The Nature of Accreting Black Holes in Nearby Galaxy Nuclei
• On The Maximum Mass of Stellar Black Holes
• Super-critically accreting stellar-mass black holes as ultraluminous X-ray sources
• An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907
• Global Structure of Three Distinct Accretion Flows and Outflows around Black Holes through Two-Dimensional Radiation-Magnetohydrodynamic Simulations
• Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13
• Ultraluminous X-ray Sources in the Chandra and XMM-Newton Era
• Resolved atomic lines reveal outflows in two ultraluminous X-ray sources
• A spectral-timing model for ULXs in the super-critical regime
• The ultraluminous X-ray sources NGC 1313 X-1 and X-2: a broadband study with NuSTAR and XMM-Newton
• Low metallicity natal environments and black hole masses in Ultraluminous X-ray Sources
• Stellar Mass Black Hole Binaries as ULXs
• Supercritical Accretion Discs in Ultraluminous X-ray Sources and SS 433
• The star-forming environment of a ULX in NGC 4559: an optical study
• Optical counterparts of the nearest ultraluminous X-ray sources
• The optical counterpart of a Ultraluminous X-Ray Object in M81
• The unusual supernova remnant surrounding the ultraluminous X-ray source IC 342 X-1
• An Optical Study of Stellar and Interstellar Environments of Seven Luminous and Ultraluminous X-Ray Sources
• The ultraluminous X-ray source NGC 1313 X-2 - Its optical counterpart and environment
• The Ultraluminous X-ray Source NGC 1313 X-2 (MS 0317.7-6647) and its Environment
• Optical emission from massive donors in ULX binary systems
• Optical Properties of the Ultraluminous X-ray Source Holmberg IX X-1 and its Stellar Environment
• Irradiation models for ULXs and fits to optical data
• Models of Ultraluminous X-Ray Sources with Intermediate-Mass Black Holes
• Optical studies of the ultraluminous X-ray source NGC1313 X-2
• Optical and Infrared Signatures of ULX's
• Optical Spectroscopy of GX339-4 during the High-Soft and Low-Hard States II: Line Ionisation and Emission Region
• X-ray and optical variability of the ultraluminous X-ray source NGC 1313 X-2
• Radio pulsars around intermediate mass black holes in super stellar clusters
• The black hole in NGC 1313 X-2: constraints on the mass from optical observations
• Ultrafast outflows in ultraluminous X-ray sources
• Searching for the orbital period of the ultraluminous X-ray source NGC 1313 X-2
• Constraining the mass of accreting black holes in ultraluminous X-ray sources with ultrafast outflows

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