论文标题
用Murchison Widefield阵列获得的无线电连续体的星系恒星形成率的估计
Estimation of the Star Formation Rate of Galaxies with Radio Continuum Obtained with Murchison Widefield Array
论文作者
论文摘要
我们研究了从{\ sl Herschel}参考调查中提取的星形星系的综合低频和红外（IR）排放之间的相关性。通过利用默奇森广场阵列（MWA）经营的银河外层次全屋MWA（GLEAM）调查，我们检查了该相关性如何在20个闪光窄带（$ 72 \ mbox { - } 231 \; [\ Mbox {MHz}] $。这些检查对于确保无线电发光度作为SFR指标的可靠性很重要。在这项研究中，我们着重于18个星形的星系，其无线电发射可通过GLEAM调查检测到。这些星系表明，单个幂律足以表征闪光频带上的远红外与Radio相关性，最高$ 1.5 \; [\ mbox {ghz}] $。因此，该波长范围内的无线电连续体可以用作良好的无尘埃SFR估计器。这对于将来与其他估计值独立研究宇宙SFR的调查尤其重要，因为可以从$ z = 0 $到高红移（$ z \ sim 5 \ sim 5 \ mbox { - } 10 $）以连贯的方式检测到无线电连续体。
We investigate the correlation between the integrated low-frequency and infrared (IR) emissions of star-forming galaxies extracted from the {\sl Herschel} Reference Survey. By taking advantage of the GaLactic Extragalactic All-sky MWA (GLEAM) survey operated by the Murchison Widefield Array (MWA) we examine how this correlation varies at a function of frequency across the 20 GLEAM narrow bands at $72\mbox{--}231\; [\mbox{MHz}]$. These examinations are important for ensuring the reliability of the radio luminosity as a SFR indicator. In this study, we focus on 18 star-forming galaxies whose radio emission is detected by the GLEAM survey. These galaxies show that a single power-law is sufficient to characterise the far-infrared-to-radio correlation across the GLEAM frequency bands and up to $1.5\; [\mbox{GHz}]$. Thus, the radio continuum in this wavelength range can serve as a good dust extinction-free SFR estimator. This is particularly important for future investigation of the cosmic SFR independently from other estimators, since the radio continuum can be detected from $z=0$ to high redshifts ($z \sim 5\mbox{--}10$) in a coherent manner.
