The Massively Accreting Cluster A2029

Journal Article · 24 January 2019 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/aaf1cc · OSTI ID:1598467

Sohn, Jubee  ^[1]; Geller, Margaret J.  ^[2]; Walker, Stephen A.  ^[3]; Dell’Antonio, Ian  ^[4]; Diaferio, Antonaldo ^[5]; Rines, Kenneth J. ^[6]

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1. Smithsonian Astrophysical Observatory, Cambridge, MA (United States); Brown Unviersity
2. Smithsonian Astrophysical Observatory, Cambridge, MA (United States)
3. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
4. Brown Univ., Providence, RI (United States)
5. Univ. of Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy)
6. Western Washington Univ., Bellingham, WA (United States)

Here, 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.

• Research Organization: Brown Univ., Providence, RI (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Grant/Contract Number: SC0010010
• OSTI ID: 1598467
• Journal Information: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 871; ISSN 1538-4357
• Publisher: Institute of Physics (IOP)Copyright Statement
• Country of Publication: United States
• Language: English