{"paper":{"title":"The Stellar Populations of Two Ultra-Diffuse Galaxies from Optical and Near-infrared Photometry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aaron J. Romanowsky (SJSU, Alexa Villaume (UCSC), Benjamin D. Johnson (Harvard), David Martinez-Delgado (Heidelberg), Ignacio Martin-Navarro (UCSC, Jean-Charles Cuillandre (CEA/IRFU/SAp), Jean P. Brodie (UCSC, Jessica Krick (Caltech-IPAC), Pieter van Dokkum (Yale), Ronald Lasker (Univ. of Turku), Seppo Laine (Caltech-IPAC), Stephen Gwyn (Herzberg), UCO), Viraj Pandya (UCSC), William Glaccum (Caltech-IPAC)","submitted_at":"2017-11-14T19:00:02Z","abstract_excerpt":"We present observational constraints on the stellar populations of two ultra-diffuse galaxies (UDGs) using optical through near-infrared (NIR) spectral energy distribution (SED) fitting. Our analysis is enabled by new $Spitzer$-IRAC 3.6 $\\mu$m and 4.5 $\\mu$m imaging, archival optical imaging, and the prospector fully Bayesian SED fitting framework. Our sample contains one field UDG (DGSAT I), one Virgo cluster UDG (VCC 1287), and one Virgo cluster dwarf elliptical for comparison (VCC 1122). We find that the optical--NIR colors of the three galaxies are significantly different from each other. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.05272","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}