RELICS: High-resolution Constraints on the Inner Mass Distribution of the z = 0.83 Merging Cluster RXJ0152.7-1357 from Strong Lensing
Articolo
Data di Pubblicazione:
2019
Citazione:
RELICS: High-resolution Constraints on the Inner Mass Distribution of the z = 0.83 Merging Cluster RXJ0152.7-1357 from Strong Lensing / A. Acebron Munoz, M. Alon, A. Zitrin, G. Mahler, D. Coe, K. Sharon, N. Cibirka, M. Brada?, M. Trenti, K. Umetsu, F. Andrade-Santos, R.J. Avila, L. Bradley, D. Carrasco, C. Cerny, N.G. Czakon, W.A. Dawson, B. Frye, A.T. Hoag, K.-. Huang, T.L. Johnson, C. Jones, S. Kikuchihara, D. Lam, R.C. Livermore, L. Lovisari, R. Mainali, P.A. Oesch, S. Ogaz, M. Ouchi, M. Past, R. Paterno-Mahler, A. Peterson, R.E. Ryan, B. Salmon, I. Sendra-Server, D.P. Stark, V. Strait, S. Toft, B. Vulcani. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 1538-4357. - 874:2(2019 Apr 01), pp. 132.1-132.13. [10.3847/1538-4357/ab0adf]
Abstract:
The combined fit of the measured energy spectrum and shower maximum depth distributions of ultra-high-energy cosmic rays is known to constrain the parameters of astrophysical models with homogeneous source distributions. Studies of the distribution of the cosmic-ray arrival directions show a better agreement with models in which a fraction of the flux is non-isotropic and associated with the nearby radio galaxy Centaurus A or with catalogs such as that of starburst galaxies. Here, we present a novel combination of both analyses by a simultaneous fit of arrival directions, energy spectrum, and composition data measured at the Pierre Auger Observatory. The model takes into account a rigidity-dependent magnetic field blurring and an energy-dependent evolution of the catalog contribution shaped by interactions during propagation. We find that a model containing a flux contribution from the starburst galaxy catalog of around 20% at 40 EeV with a magnetic field blurring of around 20◦ for a rigidity of 10 EV provides a fair simultaneous description of all three observables. The starburst galaxy model is favored with a significance of 4.5σ (considering experimental systematic effects) compared to a reference model with only homogeneously distributed background sources. By investigating a scenario with Centaurus A as a single source in combination with the homogeneous background, we confirm that this region of the sky provides the dominant contribution to the observed anisotropy signal. Models containing a catalog of jetted active galactic nuclei whose flux scales with the γ-ray emission are, however, disfavored as they cannot adequately describe the measured arrival directions.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
galaxies: clusters: individual (RXJ0152.7-1357, CL0152.7-1357); galaxies: high-redshift; gravitational lensing: strong;
Elenco autori:
A. Acebron Munoz, M. Alon, A. Zitrin, G. Mahler, D. Coe, K. Sharon, N. Cibirka, M. Brada?, M. Trenti, K. Umetsu, F. Andrade-Santos, R.J. Avila, L. Bradley, D. Carrasco, C. Cerny, N.G. Czakon, W.A. Dawson, B. Frye, A.T. Hoag, K.-. Huang, T.L. Johnson, C. Jones, S. Kikuchihara, D. Lam, R.C. Livermore, L. Lovisari, R. Mainali, P.A. Oesch, S. Ogaz, M. Ouchi, M. Past, R. Paterno-Mahler, A. Peterson, R.E. Ryan, B. Salmon, I. Sendra-Server, D.P. Stark, V. Strait, S. Toft, B. Vulcani
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