Filamentary baryons and where to find them

Author:

Oei Martijn S. S. L.ORCID,van Weeren Reinout J.,Vazza Franco,Leclercq FlorentORCID,Gopinath AkshathaORCID,Röttgering Huub J. A.

Abstract

Context. The detection of synchrotron radiation from the intergalactic medium (IGM) that pervades the filaments of the Cosmic Web constitutes an upcoming frontier to test physical models of astrophysical shocks and their radiation mechanisms, trace the missing baryons, and constrain magnetogenesis – the origin and evolution of extragalactic magnetic fields. Aims. The first synchrotron detections of the IGM within filaments have recently been claimed. Now is the time to develop a rigorous statistical framework to predict sky regions with the strongest signal and to move from mere detection to inference, that is to say identifying the most plausible physical models and parameter values from observations. Methods. Current theory posits that the filament IGM lights up through shocks that originate from large-scale structure formation. With Bayesian inference, we generated a probability distribution on the set of specific intensity functions that represent our view of the merger- and accretion-shocked synchrotron Cosmic Web (MASSCW). We combined the Bayesian Origin Reconstruction from Galaxies (BORG) Sloan Digital Sky Survey (SDSS) total matter density posterior, which is based on spectroscopic observations of galaxies within SDSS DR7, snapshots of Enzo magnetohydrodynamics (MHD) cosmological simulations, a Gaussian random field (GRF), and a ray tracing approach to arrive at the result. Results. We present a physics-based prediction of the MASSCW signal, including principled uncertainty quantification, for a quarter of the sky and up to cosmological redshift zmax = 0.2. The super-Mpc 3D resolution of the current implementation limits the resolution of the predicted 2D imagery, so that individual merger and accretion shocks are not resolved. The MASSCW prior can be used to identify the most promising fields to target with low-frequency radio telescopes and to conduct actual detection experiments. We furthermore calculated a probability distribution for the flux-density–weighted mean (i.e. sky-averaged) redshift z̄̄ of the MASSCW signal up to zmax, and found a median of z̄̄ = 0.077. We constructed a low-parametric analytic model that produces a similar distribution for z̄̄, with a median of z̄̄ = 0.072. Extrapolating the model, we were able to calculate z̄̄ for all large-scale structure in the Universe (including what lies beyond zmax) and show that, if one only considers filaments, z̄̄ depends on virtually one parameter. As case studies, we finally explore the predictions of our MASSCW specific intensity function prior in the vicinity of three galaxy clusters, the Hercules Cluster, the Coma Cluster, and Abell 2199, and in three deep Low-frequency Array (LOFAR) High-band Antennae (HBA) fields, the Lockman Hole, Abell 2255, and the Ursa Major Supercluster. Conclusions. We describe and implement a novel, flexible, and principled framework for predicting the low-frequency, low-resolution specific intensity function of the Cosmic Web due to merger and accretion shocks that arise during large-scale structure formation. The predictions guide Local Universe searches for filamentary baryons through half of the Northern Sky. Once cosmological simulations of alternative emission mechanisms have matured, our approach can be extended to predict additional physical pathways that contribute to the elusive synchrotron Cosmic Web signal.

Funder

NWO

ERC

Publisher

EDP Sciences

Subject

Space and Planetary Science,Astronomy and Astrophysics

Reference100 articles.

1. Radio emission in the cosmic web

2. Baring M. G. 1997, in Very High Energy Phenomena in the Universe; Moriond Workshop, eds. Giraud-Heraud Y., & Tran Thanh van J., 97

3. The acceleration of cosmic rays in shock fronts - I

Cited by 6 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Where shadows lie: reconstruction of anisotropies in the neutrino sky;Journal of Cosmology and Astroparticle Physics;2023-10-01

2. A search for intercluster filaments with LOFAR and eROSITA;Monthly Notices of the Royal Astronomical Society;2023-06-22

3. Measuring the giant radio galaxy length distribution with the LoTSS;Astronomy & Astrophysics;2023-04

4. Optical circular polarization induced by axionlike particles in blazars;Physical Review D;2023-02-23

5. Polarized accretion shocks from the cosmic web;Science Advances;2023-02-17

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3