The Spiderweb Protocluster is Being Magnetized by Its Central Radio Jet

被引：16

作者：

Anderson, Craig S. ^{[1
]}

Carilli, Christopher L. ^{[1
]}

Tozzi, Paolo ^{[2
]}

Miley, G. K. ^{[3
]}

Borgani, S. ^{[4
,5
,6
,7
]}

Clarke, Tracy ^{[8
]}

Di Mascolo, Luca ^{[4
]}

Liu, Ang ^{[9
]}

Mroczkowski, Tony ^{[10
]}

Pannella, Maurilio ^{[4
]}

Pentericci, L. ^{[11
]}

Rottgering, H. J. A. ^{[3
]}

Saro, A. ^{[4
,5
,6
,7
]}

机构：

[1] Natl Radio Astron Observ, POB 0, Socorro, NM 87801 USA

[2] INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy

[3] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[4] Univ Trieste, Sez Astron, Dipartimento Fis, Via Tiepolo 11, I-34131 Trieste, Italy

[5] INAF Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34131 Trieste, Italy

[6] Ist Nazl Fis Nucl, Sez Trieste, Via Valerio 2, I-34127 Trieste Ts, Italy

[7] Inst Fundamental Phys Universe, IFPU, Via Beirut 2, I-134151 Trieste, Italy

[8] Naval Res Lab, Code 7213,4555 Overlook Ave SW, Washington, DC 20375 USA

[9] Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany

[10] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[11] INAF Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 937卷 / 01期

关键词：

SHOCKED RELATIVISTIC JETS; ACTIVE GALACTIC NUCLEI; MASSIVE CLUSTER GALAXY; WAVE BAND QUIESCENT; FARADAY-ROTATION; SYNCHROTRON EMISSION; STAR-FORMATION; MOLECULAR GAS; ALMA OBSERVATIONS; BURST EMISSION;

D O I：

10.3847/1538-4357/ac7ec0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present deep broadband radio polarization observations of the Spiderweb radio galaxy (J1140-2629) in a galaxy protocluster at z = 2.16. These yield the most detailed polarimetric maps yet made of a high-redshift radio galaxy. The intrinsic polarization angles and Faraday rotation measures (RMs) reveal coherent magnetic fields spanning the similar to 60 kpc length of the jets, while similar to 50% fractional polarizations indicate these fields are well ordered. Source-frame vertical bar RM vertical bar values of similar to 1000 rad m(-2) are typical, and values up to similar to 11,100 rad m(-2) are observed. The Faraday-rotating gas cannot be well mixed with the synchrotron-emitting gas, or stronger-than-observed depolarization would occur. Nevertheless, an observed spatial coincidence between a localized vertical bar RM vertical bar enhancement of similar to 1100 rad m(-2), a bright knot of Lya emission, and a deviation of the radio jet provide direct evidence for vigorous jet-gas interaction. We detect a large-scale RM gradient totaling similar to 1000 s rad m(-2) across the width of the jet, suggesting a net clockwise (as viewed from the active galactic nuclei) toroidal magnetic field component exists at tens-of-kiloparsec scales, which we speculate may be associated with the operation of a Poynting-Robertson cosmic battery. We conclude the RMs are mainly generated in a sheath of hot gas around the radio jet, rather than the ambient foreground protocluster gas. The estimated magnetic field strength decreases by successive orders of magnitude going from the jet hotspots (similar to 90 mu G) to the jet sheath (similar to 10 mu G) to the ambient intracluster medium (similar to 1 mu G). Synthesizing our results, we propose that the Spiderweb radio galaxy is actively magnetizing its surrounding protocluster environment, with possible implications for theories of the origin and evolution of cosmic magnetic fields.

引用

页数：13

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