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The mass of the black hole in GRS 1915+105: new constraints from infrared spectroscopy

D. J. HurleyDepartment of Physics, University College Cork, Cork, IrelandP. J. CallananDepartment of Physics, University College Cork, Cork, IrelandP. ElebertDepartment of Physics, University College Cork, Cork, IrelandM. T. ReynoldsDepartment of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA

2013en

ABI

Annotatsiya

GRS 1915+105 has the largest mass function of any Galactic black hole system, although the error is relatively large. Here we present spectroscopic analysis of medium-resolution infrared Very Large Telescope archival data of GRS 1915+105 in the K band. We find an updated ephemeris, and report on attempts to improve the mass function by a refinement of the radial velocity estimate. We show that the spectra are significantly affected by the presence of phase-dependent CO bandhead emission, possibly originating from the accretion disc: we discuss the impact this has on efforts to better constrain the black hole mass. We report on a possible way to measure the radial velocity utilizing apparent H-band atomic absorption features and also discuss the general uncertainty of the system parameters of this well-studied object.

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DOI: 10.1093/mnras/stt001

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