Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-23
Erratum-ibid. 357 (2005) 1104
Astronomy and Astrophysics
Astrophysics
in press: 2004, MNRAS volume 481 (erratum added)
Scientific paper
10.1111/j.1365-2966.2004.08327.x
We study the origin of the ultraluminous X-ray source M82-X1 in the nearby starburst galaxy M82. This X-ray source is of particular interest as it is currently the best candidate intermediate mass black hole; it is associated with a 54mHz quasi periodic oscillations with a relatively low (~1keV) black-body temperature. We perform detailed binary evolution calculations of 2--15Msun stars which transfer mass to a 100--2000Msun black hole and present an empirical model for the X-ray characteristics expected for such binaries. Based on the binary evolution calculations and the assumption in our simulations we conclude that the most likely candidate for the bright X-ray source M82-X1 is a 10-15Msun star near the end of its main-sequence or slightly evolved, which transfers mass to a ~1000Msun black hole. We expect the system to be in the high/soft state. In that case the binary will not be visible as a source of gravitational wave radiation, but other transient X-ray binaries with lower mass donors way be rather bright sources of gravitational wave radiation.
Dewi Jasinta
Maccarone Tom
Portegies Zwart Simon
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