Exploring Accretion and Disk-Jet Connections in the LLAGN M81*

Abstract

We report on a year-long effort to monitor the central supermassive black hole in M81 in the X-ray and radio bands. Using Chandra and the VLA, we obtained quasi-simultaneous observations of M81* on seven occasions during 2006. The X-ray and radio luminosity of M81* are not strongly correlated on the approximately 20-day sampling timescale of our observations, which is commensurate with viscous timescales in the inner flow and orbital timecales in a radially-truncated disk. This suggests that short-term variations in black hole activity may not be rigidly governed by the "fundamental plane", but rather adhere to the plane in a time-averaged sense. Fits to the X-ray spectra of M81* with bremsstrahlung models give temperatures that are inconsistent with the outer regions of very simple advection-dominated inflows. However, our results are consistent with the X-ray emission originating in a transition region where a truncated disk and advective flow may overlap. We discuss our results in the context of models for black holes accreting at small fractions of their Eddington limit, and the fundamental plane of black hole accretion.

Accepted for publication in ApJ

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• Broadband X-ray Spectra of the Ultraluminous X-ray Source Holmberg IX X-1 observed with NuSTAR, XMM-Newton and Suzaku
• Detection of jet precession in the active nucleus of M81
• X-ray Outflows and Super-Eddington Accretion in the Ultraluminous X-ray Source Holmberg IX X-1
• SWIFT J1910.2-0546: A possible black hole binary with a retrograde spin or truncated disk
• Fundamental Plane of Black Hole Activity in Quiescent Regime
• Discrete Knot Ejection from the Jet in a Nearby Low Luminosity Active Galactic Nucleus, M81*
• Bhjet: a public multi-zone, steady state jet + thermal corona spectral model
• The absence of a thin disc in M81
• An X-ray Census of Fast Radio Burst Host Galaxies: Constraints on AGN and X-ray Counterparts
• Nuclear Radio Jet from a Low-Luminosity Active Galactic Nucleus in NGC 4258
• A universal scaling law of black hole activity including gamma-ray bursts
• Ultra high energy cosmic rays and possible signature of black strings
• The X-ray variation of M81* resolved by Chandra and NuSTAR
• An Energetic Hot Wind from the Low-luminosity Active Galactic Nucleus M81*