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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693774.0, MPI für Astronomie / Publikationen_mpia
The SWELLS Survey - V. A Salpeter stellar initial mass function in the bulges of massive spiral galaxies
Authors:Dutton, A. A.; Treu, T.; Brewer, B. J.; Marshall, P. J.; Auger, M. W.; Barnabe, M.; Koo, D. C.; Bolton, A. S.; Koopmans, L. V. E.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:4
Start Page:3183
End Page:3195
Audience:Not Specified
Abstract / Description:Recent work has suggested that the stellar initial mass function (IMF) is not universal, but rather is correlated with galaxy stellar mass, stellar velocity dispersion, or morphological type. In this paper, we investigate variations of the IMF within individual galaxies. For this purpose, we use strong lensing and gas kinematics to measure independently the normalisation of the IMF of the bulge and disk components of a sample of 5 massive spiral galaxies with substantial bulge components taken from the SWELLS survey. We find that the stellar mass of the bulges are tightly constrained by the lensing and kinematic data. A comparison with masses based on stellar population synthesis models fitted to optical and near infrared photometry favors a Salpeter-like normalisation of the IMF. Conversely, the disk masses are less well constrained due to degeneracies with the dark matter halo, but are consistent with Milky Way type IMFs in agreement with previous studies. The disks are submaximal at 2.2 disk scale lengths, but due to the contribution of the bulges, the galaxies are baryon dominated at 2.2 disk scale lengths. Globally, our inferred IMF normalisation is consistent with that found for early-type galaxies of comparable stellar mass (> 10^11 M_sun). Our results suggest a non-universal IMF within the different components of spiral galaxies, adding to the well-known differences in stellar populations between disks and bulges.
Free Keywords:Astrophysics - Cosmology and Extragalactic Astrophysics; Astrophysics - Galaxy Astrophysics; Astrophysics - Solar and Stellar Astrophysics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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