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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31293
Title: Modern yields per stellar generation: the effect of the IMF
Authors: Vincenzo, Fiorenzo 
Matteucci, F.
BELFIORE, FRANCESCO MICHEL CONCETTO 
Maiolino, R.
Issue Date: 2016
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 455
Issue: 4
First Page: 4183
Abstract: Gaseous and stellar metallicities in galaxies are nowadays routinely used to constrain the evolutionary processes in galaxies. This requires the knowledge of the average yield per stellar generation, y<SUB>Z</SUB>, I.e. the quantity of metals that a stellar population releases into the interstellar medium (ISM), which is generally assumed to be a fixed fiducial value. Deviations of the observed metallicity from the expected value of y<SUB>Z</SUB> are used to quantify the effect of outflows or inflows of gas, or even as evidence for biased metallicity calibrations or inaccurate metallicity diagnostics. Here, we show that y_{Z} depends significantly on the initial mass function (IMF), varying by up to a factor larger than three, for the range of IMFs typically adopted in various studies. Varying the upper mass cutoff of the IMF implies a further variation of y<SUB>Z</SUB> by an additional factor that can be larger than two. These effects, along with the variation of the gas mass fraction restored into the ISM by supernovae (R, which also depends on the IMF), may yield to deceiving results, if not properly taken into account. In particular, metallicities that are often considered unusually high can actually be explained in terms of yield associated with commonly adopted IMFs such as the Kroupa or Chabrier. We provide our results for two different sets of stellar yields (both affected by specific limitations) finding that the uncertainty introduced by this assumption can be as large as ∼0.2 dex. Finally, we show that y<SUB>Z</SUB> is not substantially affected by the initial stellar metallicity as long as Z > 10<SUP>-3</SUP> Z<SUB>⊙</SUB>.
URI: http://hdl.handle.net/20.500.12386/31293
URL: https://academic.oup.com/mnras/article/455/4/4183/1270964
http://arxiv.org/abs/1503.08300v2
ISSN: 0035-8711
DOI: 10.1093/mnras/stv2598
Bibcode ADS: 2016MNRAS.455.4183V
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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