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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 5.

Recombination time (blue points), cooling time (orange squares; computed assuming a representative cooling coefficient of 10−22 erg cm3 s−1), and density (green diamonds) as a function of the radius at which each ion reaches peak emissivity. Ion labels are shown above the recombination-time points. Even the shortest recombination timescale is of order ∼8 days, far exceeding the characteristic variability timescale of ∼1 hr.

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