Multiwavelength Observations of A0620-00 in Quiescence

Cynthia S Froning, Andrew G Cantrell, Thomas Maccarone, Seventeen Others

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We present contemporaneous X-ray, ultraviolet, optical, near-infrared, and radio observations of the black hole binary system, A0620-00, acquired in 2010 March. Using the Cosmic Origins Spectrograph on the Hubble Space Telescope, we have obtained the first FUV spectrum of A0620-00 as well as NUV observations with the Space Telescope Imaging Spectrograph. The observed spectrum is flat in the FUV and very faint (with continuum fluxes sime 1e - 17 erg cm-2 s-1 Å-1). The UV spectra also show strong, broad (FWHM ~ 2000 km s-1) emission lines of Si IV, C IV, He II, Fe II, and Mg II. The C IV doublet is anomalously weak compared to the other lines, which is consistent with the low carbon abundance seen in NIR spectra of the source. Comparison of these observations with previous NUV spectra of A0620-00 shows that the UV flux has varied by factors of 2-8 over several years. We compiled the dereddened, broadband spectral energy distribution (SED) of A0620-00 and compared it to previous SEDs as
Original languageEnglish
Pages (from-to)26
JournalAstrophysical Journal
StatePublished - Dec 2011


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