Lisa Kewley - Lisa Kewley (IfA, U.Hawaii) Collaborators: C. Kobulnicky (U.Wyoming), M. Geller (SAO), B. Barton (UC Irvine), R. Jansen (ASU) B. Barton (UC Irvine), R. Jansen (ASU)
Lisa Kewley - Motivation Motivation Metallicity diagnostics Metallicity diagnostics Local samples: Local samples: NFGS Galaxy Pairs Intermediate-z: GOODS Intermediate-z: GOODS Metallicity History 0<z<1 Metallicity History 0<z<1 Future Directions Future Directions Summary
Lisa Kewley - Motivation 1. Metallicity history of star-forming galaxies still largely theoretical. Nagamine et al. (2001)
Lisa Kewley - data from Teplitz et al. (2003) filled = [OII] unfilled = H K98 [OII] SFR Our [OII] SFR log(O/H)+12~8.6 A V =1 also: Rosa-Gonzalez, Terlevich, & Terlevich (2002) Our [OII] SFR log(O/H)+12~8.8 A V =1 Motivation 2. [OII] SF History Kewley, Geller & Jansen (2004)
Lisa Kewley - Kewley & Dopita (2002, ApJS, 142, 35) Metallicity Diagnostics “R 23 ”
Lisa Kewley - Metallicity Diagnostics - [NII]/H Kewley & Dopita (2002, ApJS, 142, 35) also: Denicolo, Terlevich & Terlevich (2002, MNRAS, 330, 69) R 23 and [NII]/H re-parameterized Kobulnicky & Kewley (2004,ApJ, 617, 240)
Lisa Kewley - Local Sample: NFGS 198 galaxies objectively selected from the CfA galaxy survey (Davis & Peebles 1983, Huchra et al. 1983) full range in Hubble type full range of absolute magnitudes in CfA survey See Jansen et al. (2000)
Lisa Kewley - Local Sample: Galaxy Pairs 502 galaxies objectively selected from the CfA redshift catalog (v < 2300 km/s, v < 1035 km/s, D < 77 h -1 Mpc) Nuclear spectra for ~200 galaxies in pairs (Barton et al. 2000) EWs + stellar population synthesis “burst timescale’’ (Barton et al. 2003)
Lisa Kewley - NFGS & Galaxy Pairs Pairs NFGS Nuclear Spectra: Requires Aperture Correction
Lisa Kewley - Aperture Correction Correction ~ 0.13 dex but may vary between dex Kewley, Geller, & Jansen 2005, PASP, 117, 227
Lisa Kewley - GOODS Survey: 0.3 < z< galaxies with metallicity-quality spectra 204 galaxies with metallicity-quality spectra Metallicities calculated using EWs Metallicities calculated using EWs Upper R 23 branch assumed Upper R 23 branch assumed A v =1 assumed if no H A v =1 assumed if no H See Kobulnicky & Kewley (2004, ApJ, 617, 240)
Lisa Kewley - GOODS Survey: 0.3 < z< 1 Kobulnicky & Kewley (2004, ApJ, 617, 240)
Lisa Kewley - GOODS Survey: 0.3 < z< 1 Kobulnicky & Kewley (2004, ApJ, 617,240)
Lisa Kewley - Conclusions Galaxy pairs nuclei span larger metallicity range Galaxy pairs nuclei span larger metallicity range than NFGS: than NFGS: less enriched - dynamical mixing? less enriched - dynamical mixing? Preliminary Metallicity History Preliminary Metallicity History (for star-forming galaxies) (for star-forming galaxies) Metallicity evolution observed.... Metallicity evolution observed.... but more work to do... but more work to do...
Lisa Kewley - Pairs GOODS assumes upper branch LBGs: Pettini et al. (2001) Shapley et al. (2004) Kobulnicky & Koo (2000) Future Directions: 0<z<3
Lisa Kewley - Future Directions Near-IR Spectra (R 23 degeneracy, A v ) Near-IR Spectra (R 23 degeneracy, A v ) Modelling of emission-line selection effects Modelling of emission-line selection effects More galaxies! More galaxies!