TY - JOUR
T1 - Connection between dynamically derived initial mass function normalization and stellar population parameters
AU - McDermid, Richard M.
AU - Cappellari, Michele
AU - Alatalo, Katherine
AU - Bayet, Estelle
AU - Blitz, Leo
AU - Bois, Maxime
AU - Bournaud, Frédéric
AU - Bureau, Martin
AU - Crocker, Alison F.
AU - Davies, Roger L.
AU - Davis, Timothy A.
AU - De Zeeuw, P. T.
AU - Duc, Pierre Alain
AU - Emsellem, Eric
AU - Khochfar, Sadegh
AU - Krajnović, Davor
AU - Kuntschner, Harald
AU - Morganti, Raffaella
AU - Naab, Thorsten
AU - Oosterloo, Tom
AU - Sarzi, Marc
AU - Scott, Nicholas
AU - Serra, Paolo
AU - Weijmans, Anne Marie
AU - Young, Lisa M.
N1 - Copyright The American Astronomical Society. First published in Astrophysical journal letters, volume 792, number 2, article L37. The original publication is available at http://doi.org/10.1088/2041-8205/792/2/L37, published by IOP Publishing. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2014/9/10
Y1 - 2014/9/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84906895644&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/792/2/L37
DO - 10.1088/2041-8205/792/2/L37
M3 - Article
VL - 792
SP - 1
EP - 5
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L37
ER -