Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-03-09
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
To be published in Highlights of Astronomy, Vol 15, XXVIIth IAU General Assembly, JD8
Scientific paper
Elliptical galaxies comprise primarily old stars, which collectively generate a long-lasting feedback via stellar mass-loss and Type Ia SNe. This feedback can be traced by X-ray-emitting hot gas in and around such galaxies, in which little cool gas is typically present. However, the X-ray-inferred mass, energy, and metal abundance of the hot gas are often found to be far less than what are expected from the feedback, particularly in so-called low L_X/L_B ellipticals. This "missing" stellar feedback is presumably lost in galaxy-wide outflows, which can play an essential role in galaxy evolution (e.g., explaining the observed color bi-modality of galaxies). We are developing a model that can be used to properly interpret the X-ray data and to extract key information about the dynamics of the feedback and its interplay with galactic environment.
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