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The Black Hole spin in GRS 1915+105, revisited

The Black Hole spin in GRS 1915+105, revisited
The Black Hole spin in GRS 1915+105, revisited
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 data sets 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. data set, 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. data set and allows reasonable fits to the McClintock et al. data set with near-maximal spin for system distances greater than ~10 kpc. We discuss the uncertainties and implications of these estimates.
0004-637X
Middleton, Matthew
f91b89d9-fd2e-42ec-aa99-1249f08a52ad
Mills, Brianna S.
f6be272f-10ba-410a-af14-f1af8145536b
Davis, Shane W.
64462291-dcf5-4f2d-bf29-f45e63f2d3f2
Middleton, Matthew
f91b89d9-fd2e-42ec-aa99-1249f08a52ad
Mills, Brianna S.
f6be272f-10ba-410a-af14-f1af8145536b
Davis, Shane W.
64462291-dcf5-4f2d-bf29-f45e63f2d3f2

Middleton, Matthew, Mills, Brianna S. and Davis, Shane W. (2021) The Black Hole spin in GRS 1915+105, revisited. Astrophysical Journal. (doi:10.3847/1538-4357/abf2b7).

Record type: Article

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 data sets 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. data set, 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. data set and allows reasonable fits to the McClintock et al. data set with near-maximal spin for system distances greater than ~10 kpc. We discuss the uncertainties and implications of these estimates.

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The Black Hole Spin in GRS 1915+105, Revisited - Accepted Manuscript
Restricted to Repository staff only until 8 June 2022.
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Accepted/In Press date: 25 March 2021
Published date: 8 June 2021
Additional Information: arxiv is am

Identifiers

Local EPrints ID: 450305
URI: http://eprints.soton.ac.uk/id/eprint/450305
ISSN: 0004-637X
PURE UUID: 48fcd545-a639-42be-b573-800c424e0654

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Date deposited: 21 Jul 2021 16:31
Last modified: 21 Jul 2021 16:31

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Contributors

Author: Brianna S. Mills
Author: Shane W. Davis

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