{"paper":{"title":"New Evidence for a Flux-independent Spectral Index of Sgr A* in the Near-infrared","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"2), (2) University of Nevada Reno, (3) Max Planck Institute for Radio Astronomy, (4) UC Berkeley, (5) Caltech), Abhimat K. Gautam (1), Andrea M. Ghez (1), Eric E. Becklin (1), Grant C. Weldon (1), Gregory D. Martinez (1), Gunther Witzel (3), Hadrien Paugnat (1), Jessica R. Lu (4), Keith Matthews (5) ((1) UCLA, Kelly Kosmo O'Neil (1, Matthew W. Hosek Jr. (1), Shoko Sakai (1), Tuan Do (1), Zo\\\"e Haggard (1)","submitted_at":"2024-11-18T19:00:16Z","abstract_excerpt":"In this work, we measure the spectral index of Sagittarius A* (Sgr A*) between the $H$ (1.6 $\\mu$m) and $K^\\prime$ (2.2 $\\mu$m) broadband filters in the near-infrared (NIR), sampling over a factor $\\sim 40$ in brightness, the largest range probed to date by a factor $\\sim 3$. Sgr A*-NIR is highly variable, and studying the spectral index $\\alpha$ (with $F_\\nu \\propto \\nu^{\\alpha}$) is essential to determine the underlying emission mechanism. For example, variations in $\\alpha$ with flux may arise from shifts in the synchrotron cutoff frequency, changes in the distribution of electrons, or mult"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2411.11966","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2411.11966/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}