MEASURING THE ULTIMATE HALO MASS OF GALAXY CLUSTERS: REDSHIFTS AND MASS PROFILES FROM THE HECTOSPEC CLUSTER SURVEY (HeCS)

By K. Rines, Margaret J. Geller, A. Diaferio, Michael J. Kurtz. 2012

138 citations recorded by the source corpus.

The infall regions of galaxy clusters represent the largest gravitationally bound structures in a ΛCDM universe. Measuring cluster mass profiles into the infall regions provides an estimate of the ultimate mass of these halos. We use the caustic technique to measure cluster mass profiles from galaxy redshifts obtained with the Hectospec Cluster Survey (HeCS), an extensive spectroscopic survey of galaxy clusters with MMT/Hectospec. We survey 58 clusters selected by X-ray flux at 0.1 < z < 0.3. The survey includes 22,680 unique MMT/Hectospec redshifts for individual galaxies; 10,145 of these galaxies are cluster members. For each cluster, we acquired high signal-to-noise spectra for ∼200 cluster members and a comparable number of foreground/background galaxies. The cluster members trace out infall patterns around the clusters. The members define a very narrow red sequence. We demonstrate that the determination of velocity dispersion is insensitive to the inclusion of bluer members (a small fraction of the cluster population). We apply the caustic technique to define membership and estimate the mass profiles to large radii. The ultimate halo mass of clusters (the mass that remains bound in the far future of a ΛCDM universe) is on average (1.99 ± 0.11)M200, a new observational cosmological test in essential agreement with simulations. Summed profiles binned in M200 and in LX demonstrate that the predicted Navarro–Frenk–White form of the density profile is a remarkably good representation of the data in agreement with weak lensing results extending to large radius. The concentration of these summed profiles is also consistent with theoretical predictions.

Subfields: Astronomy and Astrophysics, Instrumentation, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c2b2196c8a5d29c1ccbcb7d993ce4e24e1079b7d

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Andrey V. Kravtsov
2. S. More
3. B. Diemer
4. H. Hoekstra
5. M. Cacciato
6. A. Mahdavi
7. Arif Babul
8. F. V. D. Bosch

In Instrumentation

1. B. Diemer
2. S. More
3. Andrey V. Kravtsov
4. M. Cacciato
5. H. Hoekstra
6. Arif Babul
7. A. Mahdavi
8. A. Muzzin

In Nuclear and High Energy Physics

1. Andrey V. Kravtsov
2. Arif Babul
3. A. Mahdavi
4. S. More
5. M. Viola
6. M. Cacciato
7. R. Herbonnet
8. A. Muzzin

Citations in the corpus

• LoCuSS: THE SLOW QUENCHING OF STAR FORMATION IN CLUSTER GALAXIES AND THE NEED FOR PRE-PROCESSING (2015, methodology): “Eleven of our 30 clusters were also observed by the Hectospec Cluster Survey (Rines et al. 2013), providing redshifts for an additional 971 cluster members.”
• The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses (2015, methodology): “Rines et al. (2013) find the higher mass for the other component, Abell 750, but comment that MS0906.”
• THE SPLASHBACK RADIUS AS A PHYSICAL HALO BOUNDARY AND THE GROWTH OF HALO MASS (2015, methodology): “Rines et al. (2013) used the velocity caustic method to derive mass profiles of a number of clusters to large radii.”