Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-01-31
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Accepted for publication in A&A. 10 pages & 6 figures
Scientific paper
We study the structure and internal kinematics of the "star pile" in Abell 545 - a low surface brightness structure lying in the center of the cluster.We have obtained deep long-slit spectroscopy of the star pile using VLT/FORS2 and Gemini/GMOS, which is analyzed in conjunction with deep multiband CFHT/MEGACAM imaging. As presented in a previous study the star pile has a flat luminosity profile and its color is consistent with the outer parts of elliptical galaxies. Its velocity map is irregular, with parts being seemingly associated with an embedded nucleus, and others which have significant velocity offsets to the cluster systemic velocity with no clear kinematical connection to any of the surrounding galaxies. This would make the star pile a dynamically defined stellar intra-cluster component. The complicated pattern in velocity and velocity dispersions casts doubts on the adequacy of using the whole star pile as a dynamical test for the innermost dark matter profile of the cluster. This status is fulfilled only by the nucleus and its nearest surroundings which lie at the center of the cluster velocity distribution.
Lloyd-Davies Ed
Richtler Tom
Romanowsky Aaron J.
Salinas Ricardo
Schuberth Ylva
No associations
LandOfFree
Crazy heart: kinematics of the "star pile" in Abell 545 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 Crazy heart: kinematics of the "star pile" in Abell 545, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crazy heart: kinematics of the "star pile" in Abell 545 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-499826