Correlated radio:X-ray emission in the hard states of Galactic microquasars

Abstract

We present results of our study of correlated radio and X-ray emission in two black hole candidates and Galactic microquasars GRS 1915+105 and Cygnus X-1 in their steady long term hard states, along with Cygnus X-3 (using data obtained from RXTE-ASM, CGRO-BATSE and GBI). We detect a pivotal behavior in the X-ray spectrum of GRS 1915+105, correlated to the radio emission. Similar to the results obtained for Cygnus X-3, the flux of X-rays softer than the pivoting point correlates with the radio emission, while the corresponding harder X-ray flux anti-correlates with both the radio and the softer X-ray emission, in this state. We examine all the previously reported correlations of X-ray properties with the radio emission in Galactic microquasars and argue that these are consistent with a general picture where a spectral pivoting is a common feature in these sources with the shape of the spectrum determining the flux of radio emission, during the hard states. We also detect a general monotonic increase in the radio emission of these sources with the soft X-ray emission spanning about 5 orders of magnitude. We qualitatively explain these findings with a Two Component Advective Flow model where the location of a boundary layer between the thin disk and the Comptonizing region determines the spectral shape and also the amount of outflow.

arXiv commentMinor typos corrected in matter as well as figures. 12 pages, 5 figures, to appear in ApJ, August 2003 (vol. 593)

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• A unified accretion-ejection paradigm for Black Hole X-ray Binaries
• On the origin of the various types of radio emission in GRS 1915+105
• On the Radio/X-ray Correlation in Microquasars
• From Multiwavelength to Mass Scaling: Accretion and Ejection in Microquasars and AGN
• Detection of anti-correlated hard X-ray time lag in Cygnus X-3
• Anti-correlated hard X-ray time lag in GRS 1915+105: evidence for a truncated accretion disc
• A precise measurement of the orbital period parameters of Cygnus X-3
• A truncated accretion disk in the galactic black hole source H1743-322
• Binary corrected X-ray light curve of Cygnus X-3 : implications for the timing properties of the compact binary system
• A study of the cross-correlation and time lag in black hole X-ray binary XTE J1859+226