Elemental Abundances of the Hot Atmosphere of Luminous Infrared Galaxy
  Arp 299
  Hot atmospheres of massive galaxies are enriched with metals. Elemental
abundances measured in the X-ray band have been used to study the chemical
enrichment of supernova remnants, elliptical galaxies, groups and clusters of
galaxies. Here we measure the elemental abundances of the hot atmosphere of
luminous infrared galaxy Arp 299 observed with XMM-Newton. To measure the
abundances in the hot atmosphere, we use a multi-temperature thermal plasma
model, which provides a better fit to the Reflection Grating Spectrometer data.
The observed Fe/O abundance ratio is subsolar, while those of Ne/O and Mg/O are
slightly above solar. Core-collapse supernovae (SNcc) are the dominant metal
factory of elements like O, Ne, and Mg. We find some deviations between the
observed abundance patterns and theoretical ones from a simple chemical
enrichment model. One possible explanation is that massive stars with
$M_{\star}\gtrsim23-27~M_{\odot}$ might not explode as SNcc and enrich the hot
atmosphere. This is in accordance with the missing massive SNcc progenitors
problem, where very massive progenitors $M_{\star}\gtrsim18~M_{\odot}$ of SNcc
have not been clearly detected. It is also possible that theoretical SNcc
nucleosynthesis yields of Mg/O yields are underestimated.
