Can the Steep Mass Profile of A1689 Be Explained by a Triaxial Dark Halo?

Details Can the Steep Mass Profile of A1689 Be Explained by a Triaxial Dark Halo? Can the Steep Mass Profile of A1689 Be Explained by a Triaxial Dark Halo?

2005-05-20

arxiv.org/abs/astro-ph/0505452v2

Astrophys.J. 632 (2005) 841-846

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, accepted for publication in ApJ

Scientific paper

10.1086/452629

The steep mass profile of A1689 derived from recent detailed lensing observations is not readily reconciled with the low concentration halos predicted by the standard CDM model. However, halo triaxiality may act to bias the profile constraints derived assuming a spherically symmetric mass distribution, since lensing relates only to the projected mass distribution. A degree of halo triaxiality is inherent to the CDM structure formation, arising from the collision-less nature of the dark matter. Here we compare the CDM-based model predictions of triaxial halo with the precise lensing measurements of A1689 based on the ACS/HST and Subaru data, over a wide range of 10kpc

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