The black hole in NGC 1313 X-2: constraints on the mass from optical observations

Abstract

We present a theoretical study on the nature of the ultra-luminous X-ray source NGC 1313 X-2. We evolved a set of binaries with high mass donor stars orbiting a 20 M_Sun or a 50-100 M_Sun black hole. Using constraints from optical observations we restricted the candidate binary system for NGC 1313 X-2 to be either a 50-100 M_Sun black hole accreting from a 12-15 M_Sun main sequence star or a ~20 M_Sun black hole with a 12-15 M_Sun giant donor. If the modulation of ~6.12 days recently identified as the orbital period of the system is confirmed, a ~20 M_Sun black hole model becomes unlikely and we are left with the only possibility that the compact accretor in NGC 1313 X-2 is a massive black hole of ~50-100 M_Sun.

6 pages, 2 figures, Accepted by MNRAS Letters

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Cited by in corpus (21)

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• (No) dynamical constraints on the mass of the black hole in two ULXs
• Milliarcsec-scale radio emission of ultraluminous X-ray sources: steady jet emission from an intermediate-mass black hole?
• Roche-lobe overflow systems powered by black holes in young star clusters: the importance of dynamical exchanges
• Searching for the Donor Stars of ULX Pulsars
• Modelling optical emission of Ultra-luminous X-ray Sources accreting above the Eddington limit
• A minor merger scenario for the ultraluminous X-ray source ESO 243-49 HLX-1 - II. Constraints from photometry
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• Optical Counterparts of ULXs and Their Host Environments in NGC 4490/4485
• Swift observations of the ultraluminous X-ray source XMMU J004243.6+412519 in M31
• Optical Counterparts of ULXs in NGC 1672
• The metallicity of the nebula surrounding the ultra-luminous X-ray source NGC 1313 X-2
• Modelling multiwavelength emission of Ultra-luminous X-ray Sources accreting above the Eddington limit
• The ULX Source X-3 in NGC 4258: A Search for Its X-ray and Optical Properties
• Optical Counterparts of an Ultraluminous X-Ray Source X-1 in NGC 2500
• Optical variability of the ultraluminous X-ray source NGC 1313 X-2
• Optical Counterparts of ULXs in Two Dwarf Galaxies: NGC 4861 and NGC 4449
• Optical Counterparts of Two Candidate Ultraluminous X-ray Sources in NGC 4536
• The black hole in NGC 1313 X-2
• Possible optical counterparts of ULXs in NGC 1672