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Title: Joining X-Ray to Lensing: An Accurate Combined Analysis of MACS J0416.1–2403

Abstract

We present a novel approach for a combined analysis of X-ray and gravitational lensing data and apply this technique to the merging galaxy cluster MACS J0416.1–2403. The method exploits the information on the intracluster gas distribution that comes from a fit of the X-ray surface brightness and then includes the hot gas as a fixed mass component in the strong-lensing analysis. With our new technique, we can separate the collisional from the collision-less diffuse mass components, thus obtaining a more accurate reconstruction of the dark matter distribution in the core of a cluster. We introduce an analytical description of the X-ray emission coming from a set of dual pseudo-isothermal elliptical mass distributions, which can be directly used in most lensing softwares. By combining Chandra observations with Hubble Frontier Fields imaging and Multi Unit Spectroscopic Explorer spectroscopy in MACS J0416.1–2403, we measure a projected gas-to-total mass fraction of approximately 10% at 350 kpc from the cluster center. Compared to the results of a more traditional cluster mass model (diffuse halos plus member galaxies), we find a significant difference in the cumulative projected mass profile of the dark matter component and that the dark matter over total mass fraction is almost constant,more » out to more than 350 kpc. In the coming era of large surveys, these results show the need of multiprobe analyses for detailed dark matter studies in galaxy clusters.« less

Authors:
;  [1];  [2]; ;  [3];  [4];  [5];  [6];  [7]
  1. Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen (Denmark)
  2. INAF, Osservatorio Astronomico di Bologna, Via Piero Gobetti, 93/3, 40129 Bologna (Italy)
  3. Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Via Saragat 1, I-44122 Ferrara (Italy)
  4. INAF—Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli (Italy)
  5. INAF—Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11 I-34143 Trieste (Italy)
  6. University Observatory Munich, Scheinerstrasse 1, D-81679 Munich (Germany)
  7. Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, I-20133 Milano (Italy)
Publication Date:
OSTI Identifier:
22663464
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 842; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; BRIGHTNESS; COLLISIONS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; EMISSION; GALAXY CLUSTERS; GRAVITATIONAL LENSES; MASS; MASS DISTRIBUTION; NONLUMINOUS MATTER; SPECTROSCOPY; SURFACES; X RADIATION; X-RAY GALAXIES

Citation Formats

Bonamigo, M., Grillo, C., Ettori, S., Caminha, G. B., Rosati, P., Mercurio, A., Annunziatella, M., Balestra, I., and Lombardi, M., E-mail: bonamigo@dark-cosmology.dk. Joining X-Ray to Lensing: An Accurate Combined Analysis of MACS J0416.1–2403. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA75CC.
Bonamigo, M., Grillo, C., Ettori, S., Caminha, G. B., Rosati, P., Mercurio, A., Annunziatella, M., Balestra, I., & Lombardi, M., E-mail: bonamigo@dark-cosmology.dk. Joining X-Ray to Lensing: An Accurate Combined Analysis of MACS J0416.1–2403. United States. doi:10.3847/1538-4357/AA75CC.
Bonamigo, M., Grillo, C., Ettori, S., Caminha, G. B., Rosati, P., Mercurio, A., Annunziatella, M., Balestra, I., and Lombardi, M., E-mail: bonamigo@dark-cosmology.dk. Tue . "Joining X-Ray to Lensing: An Accurate Combined Analysis of MACS J0416.1–2403". United States. doi:10.3847/1538-4357/AA75CC.
@article{osti_22663464,
title = {Joining X-Ray to Lensing: An Accurate Combined Analysis of MACS J0416.1–2403},
author = {Bonamigo, M. and Grillo, C. and Ettori, S. and Caminha, G. B. and Rosati, P. and Mercurio, A. and Annunziatella, M. and Balestra, I. and Lombardi, M., E-mail: bonamigo@dark-cosmology.dk},
abstractNote = {We present a novel approach for a combined analysis of X-ray and gravitational lensing data and apply this technique to the merging galaxy cluster MACS J0416.1–2403. The method exploits the information on the intracluster gas distribution that comes from a fit of the X-ray surface brightness and then includes the hot gas as a fixed mass component in the strong-lensing analysis. With our new technique, we can separate the collisional from the collision-less diffuse mass components, thus obtaining a more accurate reconstruction of the dark matter distribution in the core of a cluster. We introduce an analytical description of the X-ray emission coming from a set of dual pseudo-isothermal elliptical mass distributions, which can be directly used in most lensing softwares. By combining Chandra observations with Hubble Frontier Fields imaging and Multi Unit Spectroscopic Explorer spectroscopy in MACS J0416.1–2403, we measure a projected gas-to-total mass fraction of approximately 10% at 350 kpc from the cluster center. Compared to the results of a more traditional cluster mass model (diffuse halos plus member galaxies), we find a significant difference in the cumulative projected mass profile of the dark matter component and that the dark matter over total mass fraction is almost constant, out to more than 350 kpc. In the coming era of large surveys, these results show the need of multiprobe analyses for detailed dark matter studies in galaxy clusters.},
doi = {10.3847/1538-4357/AA75CC},
journal = {Astrophysical Journal},
number = 2,
volume = 842,
place = {United States},
year = {Tue Jun 20 00:00:00 EDT 2017},
month = {Tue Jun 20 00:00:00 EDT 2017}
}