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Disk-Wind Connection During the Heartbeats of GRS 1915+105Disk and wind signatures are seen in the soft state of Galactic black holes, while the jet is seen in the hard state. Here we study the disk-wind connection in the Rho class of variability in GRS 1915+105 using a joint NuSTAR-Chandra observation. The source shows 50 s limit cycle oscillations. By including new information provided by the reflection spectrum and using phase-resolved spectroscopy, we find that the change in the inner disk inferred from the blackbody emission is not matched by reflection measurements. The latter is almost constant, independent of the continuum model. The two radii are comparable only if the disk temperature color correction factor changes, an effect that could be due to the changing opacity of the disk caused by changes in metal abundances. The disk inclination is similar to that inferred from the jet axis, and oscillates by approx.10 deg. The simultaneous Chandra data show the presence of two wind components with velocities between 500 and 5000 km s(exp. −1), and possibly two more with velocities reaching 20,000 km s(exp. −1) (approx. 0.06 c). The column densities are approx. 5 × 10(exp. 22) cm(exp. −2). An upper limit to the wind response time of 2 s is measured, implying a launch radius of less than 6 × 10(exp. 10) cm. The changes in wind velocity and absorbed flux require the geometry of the wind to change during the oscillations, constraining the wind to be launched from a distance of 290-1300 r (sub g) from the black hole. Both data sets support fundamental model predictions in which a bulge originates in the inner disk and moves outward as the instability progresses.
Document ID
Document Type
Reprint (Version printed in journal)
Zoghbi, Abderahmen (Michigan Univ. Ann Arbor, MI, United States)
Miller, J. M. (Michigan Univ. Ann Arbor, MI, United States)
King, A. L. (Stanford Univ. Stanford, CA, United States)
Miller, M. C. (Maryland Univ. College Park, MD, United States)
Proga, D. (Nevada Univ. Las Vegas, NV, United States)
Kallman, T. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Fabian, A. C. (Cambridge Univ. Cambridge, United Kingdom)
Harrison, F. A. (California Inst. of Tech. Pasadena, CA, United States)
Kaastra, J. (SRON Space Research Organization Utrecht, Netherlands)
Raymond, J. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Reynolds, C. S. (Maryland Univ. College Park, MD, United States)
Boggs, S. E. (California Univ. Berkeley, CA, United States)
Christensen, F. E. (Technical Univ. of Denmark Lyngby, Denmark)
Craig, W. (California Univ. Berkeley, CA, United States)
Hailey, C. J. (Columbia Univ. New York, NY, United States)
Stern, D. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Zhang, W. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
June 28, 2017
Publication Date
December 15, 2016
Publication Information
Publication: The Astrophysical Journal
Volume: 833
Issue: 2
ISSN: 0004-637X
Subject Category
Numerical Analysis
Report/Patent Number
Distribution Limits
accretion disks – instabilities – X-rays: binaries – X-rays: individual (