Do cool-core (CC) and non-cool-core (NCC) clusters live in different environments? We make novel use of Hα emission lines in the central galaxies of redMaPPer clusters as proxies to construct large (1000's) samples of CC and NCC clusters and measure their relative assembly bias using both clustering and weak lensing. We increase the statistical significance of the bias measurements from clustering by cross-correlating the clusters with an external galaxy redshift catalog from the Sloan Digital Sky Survey III, the LOWZ sample. Our cross-correlations can constrain assembly bias up to a statistical uncertainty of 6%. Given our Hα criteria for CC and NCC, we find no significant differences in their clustering amplitude. Interpreting this difference as the absence of halo assembly bias, our results rule out the possibility of having different large-scale (tens of Mpc) environments as the source of diversity observed in cluster cores. Combined with recent observations of the overall mild evolution of CC and NCC properties, such as central density and CC fraction, this would suggest that either the cooling properties of the cluster core are determined early on solely by the local (<200 kpc) gas properties at formation or that local merging leads to stochastic CC relaxation and disruption in a periodic way, preserving the average population properties over time. Studying the small-scale clustering in clusters at high redshift would help shed light on the exact scenario.

On the Assembly Bias of Cool Core Clusters Traced by Hα Nebulae / Medezinski, Elinor; Mcdonald, Michael; More, Surhud; Miyatake, Hironao; Battaglia, Nicholas; Gaspari, Massimo; Spergel, David; Cen, Renyue. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 882:2(2019), pp. N/A-N/A. [10.3847/1538-4357/ab2da2]

On the Assembly Bias of Cool Core Clusters Traced by Hα Nebulae

GASPARI, MASSIMO;
2019

Abstract

Do cool-core (CC) and non-cool-core (NCC) clusters live in different environments? We make novel use of Hα emission lines in the central galaxies of redMaPPer clusters as proxies to construct large (1000's) samples of CC and NCC clusters and measure their relative assembly bias using both clustering and weak lensing. We increase the statistical significance of the bias measurements from clustering by cross-correlating the clusters with an external galaxy redshift catalog from the Sloan Digital Sky Survey III, the LOWZ sample. Our cross-correlations can constrain assembly bias up to a statistical uncertainty of 6%. Given our Hα criteria for CC and NCC, we find no significant differences in their clustering amplitude. Interpreting this difference as the absence of halo assembly bias, our results rule out the possibility of having different large-scale (tens of Mpc) environments as the source of diversity observed in cluster cores. Combined with recent observations of the overall mild evolution of CC and NCC properties, such as central density and CC fraction, this would suggest that either the cooling properties of the cluster core are determined early on solely by the local (<200 kpc) gas properties at formation or that local merging leads to stochastic CC relaxation and disruption in a periodic way, preserving the average population properties over time. Studying the small-scale clustering in clusters at high redshift would help shed light on the exact scenario.
2019
882
2
N/A
N/A
On the Assembly Bias of Cool Core Clusters Traced by Hα Nebulae / Medezinski, Elinor; Mcdonald, Michael; More, Surhud; Miyatake, Hironao; Battaglia, Nicholas; Gaspari, Massimo; Spergel, David; Cen, Renyue. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 882:2(2019), pp. N/A-N/A. [10.3847/1538-4357/ab2da2]
Medezinski, Elinor; Mcdonald, Michael; More, Surhud; Miyatake, Hironao; Battaglia, Nicholas; Gaspari, Massimo; Spergel, David; Cen, Renyue
File in questo prodotto:
File Dimensione Formato  
Medezinski_2019_ApJ_882_166.pdf

Accesso riservato

Tipologia: Versione pubblicata dall'editore
Dimensione 1.04 MB
Formato Adobe PDF
1.04 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1338354
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
social impact