{"paper":{"title":"How do minor mergers promote inside-out growth of ellipticals, transforming the size, density profile and dark matter fraction?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Jeremiah P. Ostriker, Michael Hilz, Thorsten Naab","submitted_at":"2012-06-21T20:00:06Z","abstract_excerpt":"There is observational evidence for inside-out growth of elliptical galaxies since $z \\gtrsim 2-3$, which is not driven by in-situ star formation. Many systems at high redshift have small sizes $\\sim 1kpc$ and surface brightness profiles with low Sersic indices n. The most likely descendants have, on average, grown by a factor of two in mass and a factor of four in size, indicating $r \\propto M^{\\alpha}$ with $\\alpha \\gtrsim 2$. They also have surface brightness profiles with $n \\gtrsim 5$. This evolution can be qualitatively explained on the basis of two assumptions: compact ellipticals predo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.5004","kind":"arxiv","version":2},"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"}