Jets at lowest mass accretion rates

Abstract

We present results of recent observations and theoretical modeling of data from black holes accreting at very low luminosities (L/L_Edd ~ 10^{-8}). We discuss our newly developed time-dependent model for episodic ejection of relativistic plasma within a jet framework, and a successful application of this model to describe the origin of radio flares seen in Sgr A*, the Galactic center black hole. Both the observed time lags and size-frequency relationships are reproduced well by the model. We also discuss results from new Spitzer data of the stellar black hole X-ray binary system A0620-00. Complemented by long term SMARTS monitoring, these observations indicate that once the contribution from the accretion disk and the donor star are properly included, the residual mid-IR spectral energy distribution of A0620-00 is quite flat and consistent with a non-thermal origin. The results above suggest that a significant fraction of the observed spectral energy distribution originating near black holes accreting at low luminosities could result from a mildly relativistic outflow. The fact that these outflows are seen in both stellar-mass black holes as well as in supermassive black holes at the heart of AGNs strengthens our expectation that accretion and jet physics scales with mass.

4 pages, 2 figures. To appear in Proceedings of IAU Symposium 275 "Jets at all Scales", 13-17 September 2010, Buenos Aires, Argentina

References in corpus (8)

• X-ray Properties of Black-Hole Binaries
• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• The Fundamental Plane of Accretion Onto Black Holes with Dynamical Masses
• The Inclination of the Soft X-ray Transient A0620--00 and the Mass of its Black Hole
• Simultaneous Chandra, CSO and VLA Observations of Sgr A*: The Nature of Flaring Activity
• Constraining Jet/Disk Geometry and Radiative Processes in Stellar Black Holes XTE J1118+480 and GX 339-4
• Leptonic/hadronic models for electromagnetic emission in microquasars: the case of GX 339-4

Cited by in corpus (2)

• Polarized synchrotron emission in quiescent black hole X-ray transients
• ALMA observations of A0620-00: fresh clues on the nature of quiescent black hole X-ray binary jets