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arXiv 2407.04825astro-ph.GAastro-ph.CO
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星系族以及红外与射电光度相关性的红移依赖性

Galaxy populations and redshift dependence of the correlation between infrared and radio luminosity

G. De Zotti, M. Bonato, M. Giulietti, M. Massardi, M. Negrello, H. S. B. Algera, J. Delhaize

AI总结:

本研究将恒星形成星系分为三类,发现每类的红外-射电相关参数q_IR平均值几乎不随红移变化,整体红移差异源于不同红移占主导的星系族不同,还解释了q_IR与恒星质量的关联及高红移透镜星系的高q_IR现象。

摘要:

我们认为,近邻与高红移恒星形成星系之间的红外-射电光度比差异,反映了不同红移区间占主导的恒星形成星系族的不同物理条件——包括磁场构型。我们基于参考模型,参照恒星族的年龄定义了三类星系:“普通”晚型星系主导近邻宇宙的恒星形成;“星暴”星系在更高红移(直至z~1.5)占据主导;而“原椭球星系”在高红移占主导。对COSMOS天区数据的重新分析结合文献结果表明,对每一族群而言,数据都与参数q_IR(用于量化红外-射电相关性)的几乎不随红移变化的平均值相一致。不过,我们发现在z>~3.5时平均q_IR存在上升的迹象,这与相对论电子通过宇宙微波背景的逆康普顿散射冷却导致的同步辐射变暗的预测相符。典型恒星质量从普通星系、星暴星系到原椭球星系依次增加,这解释了已报道的平均q_IR对恒星质量的依赖性。在500微米波段选出的高红移强透镜尘埃星系所具有的更高q_IR值,可能由微分放大效应解释。

英文摘要:

We argue that the difference in infrared-to-radio luminosity ratio between local and high-redshift star-forming galaxies reflects {the alternative physical conditions} -- including magnetic field configurations -- of the dominant population of star-forming galaxies in different redshift ranges. We define three galactic types, based on our reference model, with reference to ages of stellar populations. ``Normal'' late-type galaxies dominate the star formation in the nearby Universe; ``starburst'' galaxies take over at higher redshifts, up to z ~1.5; while ``protospheroidal'' galaxies dominate at high redshift. A reanalysis of data from the COSMOS field combined with literature results shows that, for each population, the data are consistent with an almost redshift-independent mean value of the parameter q_IR, which quantifies the infrared-radio correlation. However, we find a hint of an upturn of the mean q_IR at z>~3.5 consistent with the predicted dimming of synchrotron emission due to cooling of relativistic electrons by inverse Compton scattering off the cosmic microwave background. The typical stellar masses increase from normal, to starburst, and to protospheroidal galaxies, accounting for the reported dependence of the mean q_IR on stellar mass. Higher values of q_IR found for high-z strongly lensed dusty galaxies selected at 500 micron might be explained by differential magnification.

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。

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