Bibliographic Details
| Title: |
Fast infrared winds during the radio-loud and X-ray obscured stages of the black hole transient GRS 1915+105 |
| Authors: |
Sánchez-Sierras, J., Muñoz-Darias, T., Motta, S. E., Fender, R. P., Bahramian, A., Martínez-Sebastián, C., Fernández-Ontiveros, J. A., Casares, J., Padilla, M. Armas, Green, D. A., Sánchez, D. Mata, Strader, J., Torres, M. A. P. |
| Publication Year: |
2023 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics |
| More Details: |
The black hole transient GRS 1915+105 entered a new phase of activity in 2018, generally characterised by low X-ray and radio fluxes. This phase has been only interrupted by episodes of strong and variable radio emission, during which high levels of X-ray absorption local to the source were measured. We present 18 epochs of near-infrared spectroscopy (2018-2023) obtained with GTC/EMIR and VLT/X-shooter, spanning both radio-loud and radio-quiet periods. We demonstrate that radio-loud phases are characterised by strong P-Cygni line profiles, indicative of accretion disc winds with velocities of up to $\mathrm{\sim 3000~km~s^{-1}}$. This velocity is consistent with those measured in other black hole transients. It is also comparable to the velocity of the X-ray winds detected during the peak outburst phases in GRS 1915+105, reinforcing the idea that massive, multi-phase outflows are characteristic features of the largest and most powerful black hole accretion discs. Conversely, the evolution of the Br$\gamma$ line profile during the radio-quiet phases follows the expected trend for accretion disc lines in a system that is gradually decreasing its intrinsic luminosity, exhibiting weaker intensities and more pronounced double-peaks.
Comment: Accepted for publication in A&A Letters |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/2311.12933 |
| Accession Number: |
edsarx.2311.12933 |
| Database: |
arXiv |
