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Title: Tidal stripping as a test of satellite quenching in redMaPPer clusters

When dark matter haloes are accreted by massive host clusters, strong gravitational tidal forces begin stripping mass from the accreted subhaloes. This stripping eventually removes all mass beyond a subhalo's tidal radius, with unbound mass remaining in the vicinity of the satellite for at most a dynamical time tdyn. The N-body subhalo study of Chamberlain et al. verified this picture and pointed out a useful observational consequence: correlations between subhaloes beyond the tidal radius are sensitive to the infall time, tinfall, of the subhalo on to its host. We perform this correlation using ~160 000 red satellite galaxies in Sloan Digital Sky Survey redMaPPer clusters and find evidence that subhalo correlations do persist well beyond the tidal radius, suggesting that many of the observed satellites fell into their current host less than a dynamical time ago, tinfall < tdyn. Combined with estimated dynamical times tdyn ~3–5 Gyr and SED fitting results for the time at which satellites stopped forming stars, tquench ~6 Gyr, we infer that for a significant fraction of the satellites, star formation quenched before those satellites entered their current hosts. Finally, the result holds for red satellites over a large range of cluster-centric distances 0.1–0.6 Mpc hmore » –1. We discuss the implications of this result for models of galaxy formation.« less
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  3. Univ. of Arizona, Tucson, AZ (United States)
  4. Siena College, Loudonville, NY (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 463; Journal Issue: 2; Journal ID: ISSN 0035-8711
Royal Astronomical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; galaxies: clusters: general; galaxies: formation
OSTI Identifier: