The Massively Accreting Cluster A2029
Abstract
We explore the structure of galaxy cluster A2029 and its surroundings based on intensive spectroscopy along with X-ray and weak lensing observations. The redshift survey includes 4376 galaxies (1215 spectroscopic cluster members) within 40‧ of the cluster center; the redshifts are included here. Two subsystems, A2033 and a southern infalling group (SIG), appear in the infall region based on the spectroscopy, as well as on the weak lensing and X-ray maps. The complete redshift survey of A2029 also identifies at least 12 foreground and background systems (10 are extended X-ray sources) in the A2029 field; we include a census of their properties. The X-ray luminosities (L X )-velocity dispersions ({σ }cl}) scaling relations for A2029, A2033, SIG, and the foreground/background systems are consistent with the known cluster scaling relations. The combined spectroscopy, weak lensing, and X-ray observations provide a robust measure of the masses of A2029, A2033, and SIG. The total mass of the infalling groups (A2033 and SIG) is ∼60% of the M 200 of the primary cluster, A2029. Simple dynamical considerations suggest that A2029 will accrete these subsystems in the next few Gyr. In agreement with simulations and other clusters observed in a similar redshift range, the total mass in the A2029 infall region is comparable to the A2029 M 200 and will mostly be accreted in the long-term future.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 2019
- DOI:
- 10.3847/1538-4357/aaf1cc
- arXiv:
- arXiv:1808.00488
- Bibcode:
- 2019ApJ...871..129S
- Keywords:
-
- galaxies: clusters: individual: A2029;
- A2033;
- galaxies: distances and redshifts;
- large-scale structure of universe;
- surveys;
- X-rays: galaxies: clusters;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 15 pages, 10 figures, ApJ submitted