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THE POWER OF IMAGING: CONSTRAINING THE PLASMA PROPERTIES OF GRMHD SIMULATIONS USING EHT OBSERVATIONS OF Sgr A*

  • Authors: Chi-Kwan Chan, Dimitrios Psaltis, Feryal Özel, Ramesh Narayan, and Aleksander Sa¸dowski

Chan et al. 2015 The Astrophysical Journal 799 1.

  • Provider: AAS Journals

Caption: Figure 2.

Broadband spectra computed for the suite of GRMHD simulations listed in Table 1. Each column corresponds to a different simulation, while each row shows the effect of varying one of the model parameters. The data points in the first column correspond to various observations of Sgr A*. The top “Fiducial” row uses parameters i = 60°, ne = 3.2 × 108, βthreshold = 0.2, θdisk = 0.01, and Te, funnel = 10. In each panel, the shaded gray area marks the variability of spectra computed from 100 snapshots; the black solid curve marks their average; the red dotted curve marks the average spectrum of the inner accretion flow; the green dotted curve marks the average spectrum computed after extrapolating the properties of the flow out to the Bondi radius; and the blue dashed curve marks the spectrum of the mean flow. We vary the normalization of the electron density ne in the second row, the observer's inclination i in the third row, the threshold plasma-β in the fourth row, and the electron–ion temperature ratio θdisk in the disk in the fifth row. In the sixth row, we either vary the funnel electron temperature Te, funnel (solid curves) or the funnel electron–ion temperature ratio θfunnel (dashed curves).

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