{"paper":{"title":"The 2dF Galaxy Redshift Survey: Galaxy luminosity functions per spectral type","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"B.A. Peterson, C. Collins, C. Jackson, C.M. Baugh, C.S. Frenk, D.S. Madgwick (Cambridge), G. Dalton, G. Efstathiou, I.K. Baldry, I. Lewis, J.A. Peacock, J. Bland-Hawthorn, K. Glazebrook, K. Taylor, M. Colless, O. Lahav, P. Norberg, R. Cannon, R. De Propris, R.S. Ellis, S. Cole, S. Lumsden, S. Maddox, S.P. Driver, T. Bridges, W. Couch, W. Sutherland","submitted_at":"2001-07-11T14:49:58Z","abstract_excerpt":"We calculate the optical bj luminosity function of the 2dF Galaxy Redshift Survey (2dFGRS) for different subsets defined by their spectral properties. These spectrally selected subsets are defined using a new parameter, eta, which is a linear combination of the first two projections derived from a Principal Component Analysis. This parameter eta identifies the average emission and absorption line strength in the galaxy rest-frame spectrum and hence is a useful indicator of the present star formation. We use a total of 75,000 galaxies in our calculations, chosen from a sample of high signal-to-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0107197","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"}