arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.06466astro-ph.GA
收藏

Herschel探测到的强透镜尘埃恒星形成星系样品的远红外/射电相关

The far-infrared/radio correlation for a sample of strongly lensed dusty star-forming galaxies detected by Herschel

M. Giulietti, M. Massardi, A. Lapi, M. Bonato, A. F. M. Enia, M. Negrello, Q. D'Amato, M. Behiri, G. De Zotti

摘要:

我们研究了$28$明亮高红移($1 \lesssim z \lesssim 4$)恒星形成星系的样本的无线电远红外(FIR)相关性,这些星系是从赫歇尔-阿特拉斯场的FIR中选出的,作为强引力透镜的候选者。无线电信息来自$2.1$ GHz的高灵敏度专用ATCA观测,或来自与$1.4$ GHz的FIRST调查的交叉匹配。通过利用透镜放大可能增强的源亮度,我们确定了一个弱的演变与红移出$z\lesssim 4$的前红外-射电光度比$q_{\rm FIR}$。我们还发现,$q_{\rm FIR}$参数作为无线电功率$L_{1.4\,\rm GHz}$的函数显示出明显的下降趋势,类似于文献中发现的光学/无线电选择的透镜类星体所观察到的,但覆盖了$q_{\rm FIR}-L_{1.4\,\rm GHz}$图中的互补区域。我们解释这样的行为的框架内的原位星系形成的情况下,作为一个过渡的结果,从早期的尘埃遮蔽的恒星形成阶段(主要是由我们的FIR选择精确定位)到一个晚期的射电响亮的类星体阶段(优先采样的光学/无线电选择)。

英文摘要:

We investigate the radio-far infrared (FIR) correlation for a sample of $28$ bright high-redshift ($1 \lesssim z \lesssim 4$) star-forming galaxies selected in the FIR from the Herschel-ATLAS fields as candidates to be strongly gravitationally lensed. The radio information comes either from high sensitivity dedicated ATCA observations at $2.1$ GHz or from cross-matches with the FIRST survey at $1.4$ GHz. By taking advantage of source brightness possibly enhanced by lensing magnification, we identify a weak evolution with redshift out to $z\lesssim 4$ of the FIR-to-radio luminosity ratio $q_{\rm FIR}$. We also find that the $q_{\rm FIR}$ parameter as a function of the radio power $L_{1.4\,\rm GHz}$ displays a clear decreasing trend, similarly to what is observed for optically/radio selected lensed quasars found in literature, yet covering a complementary region in the $q_{\rm FIR}-L_{1.4\,\rm GHz}$ diagram. We interpret such a behavior in the framework of an in-situ galaxy formation scenario, as a result of the transition from an early dust-obscured star-forming phase (mainly pinpointed by our FIR selection) to a late radio-loud quasar phase (preferentially sampled by the optical/radio selection).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑