Detailed study of the Bootes field using 300-500 MHz uGMRT observations: source properties and radio-infrared correlations

被引：1

作者：

Sinha, Akriti ^{[1
]}

Datta, Abhirup ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Astron Astrophys & Space Engn, Indore 453552, India

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 525卷 / 04期

关键词：

galaxies: active; galaxies: ISM; infrared: galaxies; radio continuum: galaxies; GAMMA-RAY EMISSION; DIFFUSIVE SHOCK ACCELERATION; HIGH-ENERGY NEUTRINO; COSMIC-RAYS; PARTICLE-ACCELERATION; ORIGIN; RADIATION; SPECTRUM; COCOON; FERMI;

D O I：

10.1093/mnras/stad2544

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The dominant source of radio continuum emissions at low frequencies is synchrotron radiation, which originates from star-forming regions in disc galaxies and from powerful jets produced by active galactic nuclei (AGNs). We studied the Bootes field using the upgraded Giant Meterwave Radio Telescope at 400 MHz, achieving a central minimum off-source rms noise of 35 mu Jy beam(-1) and a catalogue of 3782 sources in similar to 6 deg(2) of the sky. The resulting catalogue was compared to other radio frequency catalogues, and the corrected normalized differential source counts were derived. We use standard multiwavelength techniques to classify the sources in star-forming galaxies (SFGs), radio-loud AGNs, and radio-quiet (RQ) AGNs that confirm a boost in the SFG and RQ AGN populations at lower flux levels. For the first time, we investigated the properties of the radio-infrared (IR) relations at 400 MHz in this field. The L-400MHz-L-TIR relations for SFGs were found to show a strong correlation with non-linear slope values of 1.10 +/- 0.01, and variation of q(TIR) with z is given as q(TIR) = (2.19 +/- 0.07) (1 + z)(-0.15 +/- 0.08). This indicates that the non-linearity of the radio-IR relations can be attributed to the mild variation of q(TIR) values with z. The derived relationships exhibit similar behaviour when applied to Low-Frequency Array at 150 MHz and also at 1.4 GHz. This emphasizes the fact that other parameters like magnetic field evolution with z or the number densities of cosmic ray electrons can play a vital role in the mild evolution of q values.

引用

页码：5311 / 5327

页数：17

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