Twisting of X-ray isophotes in triaxial galaxies

Details Twisting of X-ray isophotes in triaxial galaxies Twisting of X-ray isophotes in triaxial galaxies

1997-08-22

arxiv.org/abs/astro-ph/9708212v1

Astronomy and Astrophysics

Astrophysics

18 pages, with 9 inline Postscript figures, LaTeX, aaspp4.sty, submitted to ApJ; postscript paper w/figs (200 kb) also avaliab

Scientific paper

10.1086/305151

We investigate X-ray isophote twists created by triaxiality differences between the luminous stellar distributions and the dark halos in elliptical galaxies. For a typically oblate luminous galaxy embedded in a more prolate halo formed by dissipationless collapse, the triaxiality difference of \Delta T = ~0.7 leads to typical isophote twists of <\Delta \psi_X> = ~16 deg +/- 19 deg at 3 stellar effective radii. In a model which includes baryonic dissipation the effect is smaller, with \Delta T = ~0.3 and <\Delta \psi_X> = ~5 deg +/- 8 deg. Thus, accurate measurements of X-ray isophote twists may be able to set constraints on the interactions between baryons and dissipationless dark matter during galaxy formation. The 30-deg X-ray isophote twist in the E4 galaxy NGC 720 cannot be reproduced by our model, suggesting an intrinsic misalignment between the halo and the stars rather than a projection effect.

Affiliated with

Also associated with

No associations

Rating

Twisting of X-ray isophotes in triaxial galaxies 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 Twisting of X-ray isophotes in triaxial galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Twisting of X-ray isophotes in triaxial galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-136425