New Evidence for a Flux-independent Spectral Index of Sgr A* in the Near-infrared

New Evidence for a Flux-independent Spectral Index of Sgr A* in the Near-infrared

In this work, we measure the spectral index of Sagittarius A* (Sgr A*) between the H (1.6 μ m) and $K^{\prime} $ (2.2 μ m) broadband filters in the near-infrared (NIR), sampling over a factor ∼40 in brightness, the largest range probed to date by a factor ∼3. Sgr A*-NIR is highly variable, and study...

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Bibliographic Details
Main Authors: Hadrien Paugnat, Tuan Do, Abhimat K. Gautam, Gregory D. Martinez, Andrea M. Ghez, Shoko Sakai, Grant C. Weldon, Matthew W. Hosek Jr., Zoë Haggard, Kelly Kosmo O’Neil, Eric E. Becklin, Gunther Witzel, Jessica R. Lu, Keith Matthews
Format: Article
Language:English
Published: IOP Publishing 2024-01-01
Series:The Astrophysical Journal
Subjects:
Galactic center
Supermassive black holes
Spectral index
Gaussian Processes regression
Infrared photometry
Low-luminosity active galactic nuclei
Online Access:https://doi.org/10.3847/1538-4357/ad8ac6
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https://doi.org/10.3847/1538-4357/ad8ac6

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