CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS
We report on empirical trends between the dynamically determined stellar initial mass function (IMF) and stellar population properties for a complete, volume-limited sample of 260 early-type galaxies from the ATLAS3D project. We study trends between our dynamically derived IMF normalization αdyn ≡ (...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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Institute of Physics Publishing
2014
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| _version_ | 1797075922931679232 |
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| author | McDermid, R Cappellari, M Alatalo, K Bayet, E Blitz, L Bois, M Bournaud, F Bureau, M Crocker, A Davies, R Davis, T de Zeeuw, P Duc, P Emsellem, E Khochfar, S Krajnovic, D Kuntschner, H Morganti, R Naab, T Oosterloo, T Sarzi, M Scott, N Serra, P Weijmans, A Young, L |
| author_facet | McDermid, R Cappellari, M Alatalo, K Bayet, E Blitz, L Bois, M Bournaud, F Bureau, M Crocker, A Davies, R Davis, T de Zeeuw, P Duc, P Emsellem, E Khochfar, S Krajnovic, D Kuntschner, H Morganti, R Naab, T Oosterloo, T Sarzi, M Scott, N Serra, P Weijmans, A Young, L |
| author_sort | McDermid, R |
| collection | OXFORD |
| description | We report on empirical trends between the dynamically determined stellar initial mass function (IMF) and stellar population properties for a complete, volume-limited sample of 260 early-type galaxies from the ATLAS3D project. We study trends between our dynamically derived IMF normalization αdyn ≡ (M/L)stars/(M/L)Salp and absorption line strengths, and interpret these via single stellar population-equivalent ages, abundance ratios (measured as [α/Fe]), and total metallicity, [Z/H]. We find that old and alpha-enhanced galaxies tend to have on average heavier (Salpeter-like) mass normalization of the IMF, but stellar population does not appear to be a good predictor of the IMF, with a large range of αdyn at a given population parameter. As a result, we find weak αdyn-[α/Fe] and αdyn -Age correlations and no significant αdyn -[Z/H] correlation. The observed trends appear significantly weaker than those reported in studies that measure the IMF normalization via the low-mass star demographics inferred through stellar spectral analysis. © 2014. The American Astronomical Society. All rights reserved.. |
| first_indexed | 2024-03-06T23:57:03Z |
| format | Journal article |
| id | oxford-uuid:7498fe21-1462-4fc6-a29c-61a4c2db2b9d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:57:03Z |
| publishDate | 2014 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | oxford-uuid:7498fe21-1462-4fc6-a29c-61a4c2db2b9d2022-03-26T20:04:04ZCONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERSJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7498fe21-1462-4fc6-a29c-61a4c2db2b9dEnglishSymplectic Elements at OxfordInstitute of Physics Publishing2014McDermid, RCappellari, MAlatalo, KBayet, EBlitz, LBois, MBournaud, FBureau, MCrocker, ADavies, RDavis, Tde Zeeuw, PDuc, PEmsellem, EKhochfar, SKrajnovic, DKuntschner, HMorganti, RNaab, TOosterloo, TSarzi, MScott, NSerra, PWeijmans, AYoung, LWe report on empirical trends between the dynamically determined stellar initial mass function (IMF) and stellar population properties for a complete, volume-limited sample of 260 early-type galaxies from the ATLAS3D project. We study trends between our dynamically derived IMF normalization αdyn ≡ (M/L)stars/(M/L)Salp and absorption line strengths, and interpret these via single stellar population-equivalent ages, abundance ratios (measured as [α/Fe]), and total metallicity, [Z/H]. We find that old and alpha-enhanced galaxies tend to have on average heavier (Salpeter-like) mass normalization of the IMF, but stellar population does not appear to be a good predictor of the IMF, with a large range of αdyn at a given population parameter. As a result, we find weak αdyn-[α/Fe] and αdyn -Age correlations and no significant αdyn -[Z/H] correlation. The observed trends appear significantly weaker than those reported in studies that measure the IMF normalization via the low-mass star demographics inferred through stellar spectral analysis. © 2014. The American Astronomical Society. All rights reserved.. |
| spellingShingle | McDermid, R Cappellari, M Alatalo, K Bayet, E Blitz, L Bois, M Bournaud, F Bureau, M Crocker, A Davies, R Davis, T de Zeeuw, P Duc, P Emsellem, E Khochfar, S Krajnovic, D Kuntschner, H Morganti, R Naab, T Oosterloo, T Sarzi, M Scott, N Serra, P Weijmans, A Young, L CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS |
| title | CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS |
| title_full | CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS |
| title_fullStr | CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS |
| title_full_unstemmed | CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS |
| title_short | CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS |
| title_sort | connection between dynamically derived initial mass function normalization and stellar population parameters |
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