论文标题
使用深度UGMRT无线电连续观测来检测尘埃刺激的星系中的无线电agn
Detection of radio-AGN in dust-obscured galaxies using deep uGMRT radio continuum observations
论文作者
论文摘要
无线电观察结果对粉尘的无敏化，已被利用，以揭示居住在具有较大灰尘含量的星系中的活性银河核（AGN）的种群。 In this paper, we investigate the radio characteristics of 321 dust-obscured galaxies (DOGs; S$_{\rm 24 μm}$/S$_{\rm r band}$ $\geq$1000) by using mainly deep band-3 (250$-$550 MHz) observations from the upgraded Giant Metrewave Radio Telescope (uGMRT) and 1.5 GHz Jansky非常大的阵列（JVLA）观察。我们发现，对于我们的狗样本，深度（中值噪声-RMS $ = $ 30 $ $ $ jy beam $^{ - 1} $）400 MHz Band-3 UGMRT观测值在用JVLA获得的那些（Lofar）（Lofar）（Lofar）无线电观察中获得最高的检测率（28％），并观察$ {$ {我们的样品来源的无线电特性，$ {\ it。 $ \ times $ 10 $^{23} $ w hz $^{ - 1} $），建议它们主要由紧凑型$ - $ - $ - $ - $ - $ - $ - $ - $ - $ - $ - 光谱（PS）（PS）来源，代表在尘埃环境中AGN-jet活动的早期阶段。有了堆叠，我们发现存在微弱的无线电发射（s $ _ {\ rm 400 mHz} $ = 72.9 $ $ $ $ jy beam $^{ - 1} $和s $ _ {\ rm 1.5 ghz} $ = 29 $ = 29 $ $ jy beam $ jy beam $^ - 1} $ flosign-noise $ note x yim xire x yim xir-noise $ 20）我们的研究表明，在几十$ $ $ -z $狗中的几十$ $ jy级别的微弱发射可以用作使用方千仪阵列（SKA）及其探路者计划的更深型无线电连续体调查的测试床。
Radio observations being insensitive to the dust-obscuration, have been exploited to unveil the population of Active Galactic Nuclei (AGN) residing in galaxies with large dust content. In this paper, we investigate the radio characteristics of 321 dust-obscured galaxies (DOGs; S$_{\rm 24 μm}$/S$_{\rm r band}$ $\geq$1000) by using mainly deep band-3 (250$-$550 MHz) observations from the upgraded Giant Metrewave Radio Telescope (uGMRT) and 1.5 GHz Jansky Very Large Array (JVLA) observations. We find that, for our sample of DOGs, deep (median noise-rms $=$ 30 $μ$Jy beam$^{-1}$) 400 MHz band-3 uGMRT observations yield the highest detection rate (28 per cent) among those obtained with the JVLA, and the LOw Frequency ARray (LOFAR) radio observations and the ${\it XMM-N}$ X-ray observations. The radio characteristics of our sample sources, ${\it i.e.,}$ linear extent ($<$40 kpc at $z$ $<$1.2), bimodal spectral index ($α_{\rm 400 MHz}^{\rm 1.5 GHz}$) distribution and the radio luminosities (L$_{\rm 1.5 GHz}$ $>$5.0 $\times$ 10$^{23}$ W Hz$^{-1}$), suggest them to be mainly consist of Compact$-$Steep$-$Spectrum (CSS) or Peaked-Spectrum (PS) sources representing an early phase of the AGN-jet activity in dust-obscured environments. With stacking we find the existence of faint radio emission (S$_{\rm 400 MHz}$ = 72.9 $μ$Jy beam$^{-1}$ and S$_{\rm 1.5 GHz}$ = 29 $μ$Jy beam$^{-1}$ with signal-to-noise ratio $\sim$ 20) in otherwise radio-undetected DOGs. Our study revealing the faint emission at a few tens of $μ$Jy level in high$-z$ DOGs can be used as a test-bed for the deeper radio continuum surveys planned with the Square-Kilometer Array (SKA) and its pathfinders.
