Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-16
Mon.Not.Roy.Astron.Soc. 324 (2001) 420
Astronomy and Astrophysics
Astrophysics
8 pages, 4 postscript figures, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2001.04340.x
The evolution in X-ray properties of early-type galaxies is largely unconstrained. In particular, little is known about how, and if, remnants of mergers generate hot gas halos. Here we examine the relationship between X-ray luminosity and galaxy age for a sample of early-type galaxies. Comparing normalized X-ray luminosity to three different age indicators we find that L_X/L_B increases with age, suggesting an increase in X-ray halo mass with time after a galaxy's last major star-formation episode. The long-term nature of this trend, which appears to continue across the full age range of our sample, poses a challenge for many models of hot halo formation. We conclude that models involving a declining rate of type Ia supernovae, and a transition from outflow to inflow of the gas originally lost by galactic stars, offers the most promising explanation for the observed evolution in X-ray luminosity.
Forbes Duncan A.
O'Sullivan Ewan
Ponman Trevor J.
No associations
LandOfFree
The X-ray Emission in Post-Merger Ellipticals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The X-ray Emission in Post-Merger Ellipticals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The X-ray Emission in Post-Merger Ellipticals will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-426381