The stellar IMF in early-type galaxies from a non-degenerate set of optical line indices

By C. Spiniello, Scott C. Trager, Leon V. E. Koopmans, C. Conroy. 2013

134 citations recorded by the source corpus.

We investigate the optical spectral region of spectra of 1000 stars searching for IMFsensitive features to constrain the low-mass end of the initial mass function (IMF) slope in elliptical galaxies. The use of indicators bluer than NIR features (NaI, CaT, Wing-Ford FeH) is crucial if we want to compare our observations to optical simple stellar population (SSP) models. We use the MILES stellar library (S anchez-Bl azquez

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/3fd85450f3de51b2414a57c784bdccf4e97a92f3

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Citations in the corpus

Radial variations in the stellar initial mass function of early-type galaxies (2014, background): “We note that the spectal index, bTiO, of Spiniello et al. (2014a) is very similar to the Serven et al. 2005 Mg 4780 index, that we already include in the χ2 minimization procedure.”
UV-extended E-MILES stellar population models: young components in massive early-type galaxies (2016, background): “This mismatch cannot be attributed to the effects of the IMF, which is claimed to be bottom-heavy for such massive objects (La Barbera et al. 2013; Spiniello et al. 2014).”
OVERVIEW OF THE SDSS-IV MaNGA SURVEY: MAPPING NEARBY GALAXIES AT APACHE POINT OBSERVATORY (2014, background): “…state-of-the-art dynamical modeling (e.g, Cappellari et al. 2006; Cappellari 2008; van den Bosch et al. 2008; de Lorenzi et al. 2009; Long & Mao 2010) and IMF-sensitive spectrophotometric modeling (e.g., Conroy & van Dokkum 2012b; La Barbera et al. 2013; Spiniello et al. 2014) for the first time.”
Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation (2014, background): “The work of van Dokkum & Conroy [262] (see also [263]) unambiguously showed these spectral indicators to strengthen with increasing E galaxy mass such that massive E galaxies would have had stellar IMFs much steeper than the Salpeter index.”
H0LiCOW – I. H0 Lenses in COSMOGRAIL's wellspring: program overview (2016, background): “…2014), or (2) identification/characterization of spectral features (e.g., van Dokkum & Conroy 2010; Conroy & van Dokkum 2012; Barnabè et al. 2013; Spiniello et al. 2012, 2014, 2015), and comparing this stellar mass to that obtained from lensing and dynamics, we can study properties of the…”
Modelling and interpreting spectral energy distributions of galaxies with BEAGLE (2016, methodology): “…inaccurate relative flux calibrations: one is to continuum-normalize the observed and model spectra before comparing them (e.g. Wolf et al. 2007; Spiniello et al. 2014); the other is to introduce a smooth correction function by which to multiply the model continuum, in order to bring it in…”
Evolutionary stellar population synthesis with MILES – II. Scaled-solar and α-enhanced models (2015, background): “The obtained solutions are consistent with recent studies based on absorption line strengths, which find steeper IMF slopes [α/Fe] values around ∼0.2 and old ages for massive ETGs (e.g. Conroy & van Dokkum 2012b; La Barbera et al. 2013; Spiniello et al. 2014).”