Sub-milliarcsecond Imaging of SgrA* and M87

Abstract

We present and discuss new result from mm-VLBI observations of M87 and SgrA*, using the Global mm-VLBI array (GMVA). New 3mm-VLBI images of the inner jet of M87 are presented, showing details with a spatial resolution down to 15 Schwarzschild radii. This resolution corresponds to a similar spatial resolution (in terms of R_s) obtained for Sgr A*. We discuss existing and new size determinations for this source provided by mm-VLBI at wavelengths of 3, 2, and 1.4 mm. With respect to the morphological difference between Sgr A* and M87 (the latter exhibits a long jet), a comparison of the sub-milliarcsecond structures seen with mm-VLBI may lead to a better understanding of the astro-physical processes acting in the vicinity of super-massive black holes.

Contribution to the proceedings of the Galactic Center Workshop 2006 "From the Center of the Milky Way to Nearby Low-Luminosity Galactic Nuclei", held in Bad Honnef, Germany on April 18 - 22, 2006. Editors: R. Schoedel (University of Cologne), et al.. To be published in the Journal of Physics: Conference Series by Institute of Physics Publishing. Paper contains 7 pages and 6 figures

References in corpus (13)

• General Relativistic Magnetohydrodynamic Simulations of Jet Formation and Large-Scale Propagation from Black Hole Accretion Systems
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei III. Kinematics of Parsec-Scale Radio Jets
• The supermassive black hole of M87 and the kinematics of its associated gaseous disk
• A size of ~1 AU for the radio source Sgr A* at the centre of the Milky Way
• Detection of the Intrinsic Size of Sagittarius A* through Closure Amplitude Imaging (includes Online Supporting Material)
• The simultaneous spectrum of Sgr A* from 20cm to 1mm and the nature of the mm-excess
• First Simultaneous NIR/X-ray Detection of a Flare from SgrA*
• The Flare Activity of SgrA*; New Coordinated mm to X-Ray Observations
• Radiatively inefficient MHD accretion-ejection structures
• An Attempt to Probe the Radio Jet Collimation Regions in NGC 4278, NGC 4374 (M84), and NGC 6166
• Dual frequency VSOP imaging of the jet in S5 0836+710
• Relativistic Acceleration of Magnetically Driven Jets
• Collimating, relativistic, magnetic jets from rotating disks

Cited by in corpus (27)

• Jet Launching Structure Resolved Near the Supermassive Black Hole in M87
• Gravitational Lensing by Black Holes
• High-Sensitivity 86GHz (3.5mm) VLBI Observations of M87: Deep Imaging of the Jet Base at a 10 Schwarzschild-Radius Resolution
• A Global 86GHz VLBI Survey of Compact Radio Sources
• Sagittarius A* Accretion Flow and Black Hole Parameters from General Relativistic Dynamical and Polarized Radiative Modeling
• Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole Spin
• The Event Horizon of Sagittarius A*
• High Frequency VLBI Imaging of the Jet Base of M87
• Synchrotron radiation of self-collimating relativistic MHD jets
• Inflow-Outflow Model with Conduction and Self-Consistent Feeding for Sgr A*
• Variable VHE gamma-ray emission from non-blazar AGNs
• Magnetization degree at the jet base of M87 derived from the event horizon telescope data: Testing magnetically driven jet paradigm
• The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds
• Constraining the location of rapid gamma-ray flares in the FSRQ 3C 273
• Multiwavelength VLBI observations of Sagittarius A*
• Localizing Sagittarius A* and M87 on Microarcsecond Scales with Millimeter VLBI
• Acceleration of Compact Radio Jets on Sub-parsec Scales
• The Intrinsic Shape of Sagittarius A* at 3.5-mm Wavelength
• Wisps in the Galactic center: NIR triggered observations of the radio source Sgr A* at 43 GHz
• Properties of the Radio-Emitting Gas Around SgrA*
• High Resolution Radio Astronomy Using Very Long Baseline Interferometry
• Linearly and Circularly Polarized Emission in Sagittarius A*
• No asymmetric outflows from Sagittarius A* during the pericenter passage of the gas cloud G2
• Probing spacetime around Sagittarius A* using modeled VLBI closure phases
• Spinning compact binary inspiral II: Conservative angular dynamics
• Constraining Radiatively Inefficient Accretion Flows with Polarization
• High-frequency VLBI observations of SgrA* during a multi-frequency campaign in May 2007