2015/09/30 by Charith S. Peris, Ronald A. Remillard, James F. Steiner +5
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Coronal plane #Curvature #Diagram #Flux (metallurgy) #Gamma-ray bursts and supernovae #RADIUS #Steady state (chemistry) #astro-ph.HE
paper · pdf · doi:10.3847/0004-637x/822/2/60
21 pages, 15 figures, 2 tables. Accepted for publication in ApJ
arxiv created 2016/02/29 · openalex publication_date 2016/05/05 · arxiv updated 2016/05/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
ABSTRACT We report on the X-ray spectral behavior within the steady states of GRS1915+105. Our work is based on the full data set of the source obtained using the Proportional Counter Array (PCA) on the Rossi X-ray Timing Explorer ( RXTE ) and 15 GHz radio data obtained using the Ryle Telescope. The steady observations within the X-ray data set naturally separated into two regions in the color–color diagram and we refer to these regions as steady-soft and steady-hard. GRS1915+105 displays significant curvature in the coronal component in both the soft and hard data within the RXTE /PCA bandpass. A majority of the steady-soft observations displays a roughly constant inner disk radius ( ), while the steady-hard observations display an evolving disk truncation which is correlated to the mass accretion rate through the disk. The disk flux and coronal flux are strongly correlated in steady-hard observations and very weakly correlated in the steady-soft observations. Within the steady-hard observations, we observe two particular circumstances when there are correlations between the coronal X-ray flux and the radio flux with log slopes and . They are consistent with the upper and lower tracks of Gallo et al. (2012), respectively. A comparison of the model parameters to the state definitions shows that almost all of the steady-soft observations match the criteria of either a thermal or steep power-law state, while a large portion of the steady-hard observations match the hard-state criteria when the disk fraction constraint is neglected.