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Infrared Line Diagnostics Fail to Constrain Sgr A*’s UV Output

  • Authors: Mayura Balakrishnan, Sebastiano D. von Fellenberg, Daryl Haggard, Joseph M. Michail, Nicole M. Ford, Joseph L. Hora, Laurent Loinard, Sera Markoff, Joey Neilsen, Giacomo Principe, Nadeen B. Sabha, Howard A. Smith, Zach Sumners, Shuo Zhang

Mayura Balakrishnan et al 2026 The Astrophysical Journal 1008 .

  • Provider: AAS Journals

Caption: Figure 3.

Left: comparison of CLOUDY models to the observed JWST/MIRI spectrum of the central ﹩0\mathop{.}\limits^{^{\prime\prime} }3﹩ around Sgr A. The crimson and gray curves show the MIRI MRS spectra, dereddened and observed, respectively, during the flare window, and the dashed crimson curve shows the local continuum-subtracted rms. Colored curves show the predicted flare-peak spectra for flare luminosities ﹩{L}_{{\rm{flare}}}=1{0}^{32}﹩–1039 erg s−1. The black curve shows the quiescent input SED (F. Yuan et al. 2003). For most flare models, the emission is continuum dominated, precluding the use of mid-infrared line emission to constrain the UV flux of Sgr A. Right: zoom-in to MIRI MRS wavelengths

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