First results from the IllustrisTNG simulations: radio haloes and magnetic fields

被引：950

作者：

Marinacci, Federico ^{[1
]}

Vogelsberger, Mark ^{[1
]}

Pakmor, Ruediger ^{[2
]}

Torrey, Paul ^{[1
]}

Springel, Volker ^{[2
,3
]}

Hernquist, Lars ^{[4
]}

Nelson, Dylan ^{[5
]}

Weinberger, Rainer ^{[2
]}

Pillepich, Annalisa ^{[6
]}

Naiman, Jill ^{[4
]}

Genel, Shy ^{[7
,8
]}

机构：

[1] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[2] Heidelberger Inst Theoret Studien, Schloss Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany

[3] Heidelberg Univ, Astron Recheninst, Zentrum Astron, Monchhofstr 12-14, D-69120 Heidelberg, Germany

[4] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[5] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85741 Garching, Germany

[6] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[7] Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA

[8] Columbia Univ, Columbia Astrophys Lab, 538 West 120th St, New York, NY 10027 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 480卷 / 04期

基金：

欧洲研究理事会;

关键词：

magnetic fields; MHD; methods: numerical; galaxies: clusters: general; cosmology: theory; radio continuum: general; X-RAY-EMISSION; GALAXY CLUSTERS; COSMIC-RAYS; COSMOLOGICAL SIMULATIONS; POWER SPECTRUM; AGN FEEDBACK; MINI-HALOS; EVOLUTION; RELICS; ACCELERATION;

D O I：

10.1093/mnras/sty2206

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We introduce the IllustrisTNG project, a new suite of cosmological magnetohydrodynamical simulations performed with the moving-mesh code AREPO employing an updated Illustris galaxy formation model. Here we focus on the general properties of magnetic fields and the diffuse radio emission in galaxy clusters. Magnetic fields are prevalent in galaxies, and their build-up is closely linked to structure formation. We find that structure formation amplifies the initial seed fields (10(-14) comoving Gauss) to the values observed in low-redshift galaxies (1-10 mu G). The magnetic field topology is closely connected to galaxy morphology such that irregular fields are hosted by early-type galaxies, while large-scale, ordered fields are present in disc galaxies. Using two simple models for the energy distribution of relativistic electrons we predict the diffuse radio emission of 280 clusters with a baryonic mass resolution of 1.1 x 10(7) M-circle dot, and generate mock observations for Very Large Array (VLA), Low-Frequency Array (LOFAR), Australian Square Kilometre Array Pathfinder (ASKAP), and Square Kilometre Array (SKA). Our simulated clusters show extended radio emission, whose detectability correlates with their virial mass. We reproduce the observed scaling relations between total radio power and X-ray emission, M500, and the Sunyaev-Zel'dovich Y500 parameter. The radio emission surface brightness profiles of our most massive clusters are in reasonable agreement with VI.A measurements of Coma and Perseus. Finally, we discuss the fraction of detected extended radio haloes as a function of virial mass and source count functions for different instruments. Overall our results agree encouragingly well with observations, but a refined analysis requires a more sophisticated treatment of relativistic particles in large-scale galaxy formation simulations.

引用

页码：5113 / 5139

页数：27

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