The black hole spin in GRS 1915+105, revisited

TL;DR

This study revisits the black hole spin in GRS 1915+105 using updated system parameters and the continuum-fitting method, revealing a range of possible spins influenced by uncertainties in system measurements.

Contribution

It provides revised spin estimates for GRS 1915+105 based on new distance and system parameters, addressing previous discrepancies in spin measurements.

Findings

Best-fit spin of 0.86 with new parameters

Spin range from 0.4 to 0.99 considering uncertainties

High spin estimates are consistent with larger system distances

Abstract

We estimate the black hole spin parameter in GRS 1915+105 using the continuum-fitting method with revised mass and inclination constraints based on the very long baseline interferometric parallax measurement of the distance to this source. We fit Rossi X-ray Timing Explorer observations selected to be accretion disk-dominated spectral states as described in McClintock et al. (2006) and Middleton et al. (2006), which previously gave discrepant spin estimates with this method. We find that, using the new system parameters, the spin in both datasets increased, providing a best-fit spin of $a_*=0.86$ for the Middleton et al. data and a poor fit for the McClintock et al. dataset, which becomes pegged at the BHSPEC model limit of $a_*=0.99$. We explore the impact of the uncertainties in the system parameters, showing that the best-fit spin ranges from $a_*= 0.4$ to 0.99 for the Middleton et al. dataset and allows reasonable fits to the McClintock et al. dataset with near maximal spin for system distances greater than $\sim 10$ kpc. We discuss the uncertainties and implications of these estimates.