Imprints of quasar duty cycle on the 21-cm signal from the Epoch of Reionization

被引：18

作者：

Bolgar, Florian ^{[1
]}

Eames, Evan ^{[1
]}

Hottier, Clement ^{[2
]}

Semelin, Benoit ^{[1
]}

机构：

[1] PSL Res Univ, Sorbonne Univ, Observ Paris, LERMA,CNRS, F-75014 Paris, France

[2] Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 478卷 / 04期

关键词：

radiative transfer; methods: numerical; dark ages; reionization; first stars; ACTIVE GALACTIC NUCLEI; HIGH-REDSHIFT UNIVERSE; 21 CM SIGNAL; SIMILAR-TO; 4; LUMINOSITY FUNCTION; BLACK-HOLE; COSMIC REIONIZATION; RADIATIVE-TRANSFER; EDDINGTON RATIOS; POWER SPECTRUM;

D O I：

10.1093/mnras/sty1293

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Quasars contribute to the 21-cm signal from the epoch of reionization (EoR) primarily through their ionizing ultraviolet (UV) and X-ray emission. However, their radio continuum and Lyman-band emission also regulate the 21-cm signal in their direct environment, potentially leaving the imprint of their duty cycle. We develop a model for the radio and UV luminosity functions of quasars from the EoR, and constrain it using recent observations. Our model is consistent with the recent discovery of the quasar J1342+0928 at redshift similar to 7.5, and also predicts only a few quasars suitable for 21-cm forest observations (similar to 10 mJy) in the sky. We exhibit a new effect on the 21-cm signal observed against the cosmic microwave background: A radio-loud quasar can leave the imprint of its duty cycle on the 21-cm tomography. We apply this effect in a cosmological simulation and conclude that the effect of typical radio-loud quasars is most likely negligible in an Square Kilometer Array (SKA) field of view. For a similar to 10-mJy quasar the effect is stronger though hardly observable at SKA resolution. Then we study the contribution of the Lyman-band (Ly alpha to Ly beta) emission of quasars to the Wouthuisen-Field coupling. The collective effect of quasars on the 21-cm power spectrum is larger than the thermal noise at low k, though featureless. However, a distinctive pattern around the brightest quasars in an SKA field of view may be observable in the tomography, encoding the duration of their duty cycle. This pattern has a high signal-to-noise ratio for the brightest quasar in a typical SKA shallow survey.

引用

页码：5573 / 5587

页数：15

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