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Title: Multiwavelength observations of Swift J1753.5–0127

We present contemporaneous X-ray, ultraviolet (UV), optical, and near-infrared observations of the black hole binary system Swift J1753.5–0127 acquired in 2012 October. The UV observations, obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope, are the first UV spectra of this system. The dereddened UV spectrum is characterized by a smooth, blue continuum and broad emission lines of C IV and He II. The system was stable in the UV to <10% during our observations. We estimated the interstellar reddening by fitting the 2175 Å absorption feature and fit the interstellar absorption profile of Lyα to directly measure the neutral hydrogen column density along the line of sight. By comparing the UV continuum flux to steady-state thin accretion disk models, we determined upper limits on the distance to the system as a function of black hole mass. The continuum is well fit with disk models dominated by viscous heating rather than irradiation. The broadband spectral energy distribution shows the system has declined at all wavelengths since previous broadband observations in 2005 and 2007. If we assume that the UV emission is dominated by the accretion disk, the inner radius of the disk must be truncated at radii abovemore » the innermost stable circular orbit to be consistent with the X-ray flux, requiring significant mass loss from outflows and/or energy loss via advection into the black hole to maintain energy balance.« less
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Center for Astrophysics and Space Astronomy, University of Colorado, 593 UCB, Boulder, CO 80309-0593 (United States)
  2. Department of Physics, Texas Tech University, Box 41051, Lubbock, TX 79409 (United States)
  3. Space Weather and Effects Division, Atmospheric and Environmental Research, Superior, CO (United States)
  4. Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States)
  5. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803 (United States)
  6. Faulkes Telescope Project, University of South Wales, Astrophysics Research Institute, Liverpool John Moores University (United Kingdom)
Publication Date:
OSTI Identifier:
22348342
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 780; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; ACCRETION DISKS; ADVECTION; BLACK HOLES; DENSITY; EMISSION; ENERGY BALANCE; ENERGY LOSSES; ENERGY SPECTRA; HYDROGEN; IRRADIATION; ORBITS; SPACE; STARS; STELLAR WINDS; TELESCOPES; ULTRAVIOLET RADIATION; ULTRAVIOLET SPECTRA; X RADIATION