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arXiv 1409.2499astro-ph.GA
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Herschel-ATLAS远红外射电关联的温度依赖性

The temperature dependence of the far-infrared-radio correlation in the Herschel-ATLAS

D. J. B. Smith, M. J. Jarvis, M. J. Hardcastle, M. Vaccari, N. Bourne, L. Dunne, E. Ibar, N. Maddox, M. Prescott, C. Vlahakis, S. Eales, S. J. Maddox, M. W. L. … 展开作者

D. J. B. Smith, M. J. Jarvis, M. J. Hardcastle, M. Vaccari, N. Bourne, L. Dunne, E. Ibar, N. Maddox, M. Prescott, C. Vlahakis, S. Eales, S. J. Maddox, M. W. L. Smith, E. Valiante, G. de Zotti

摘要:

我们使用10,387个来自Herschel天体物理太赫兹大区域巡天(H-ATLAS)的星系来探测恒星形成星系的远红外无线电相关性(FIRC)作为红移,波长和有效尘埃温度的函数。我们选择的250 μ m样本中的所有源都有光谱红移,以及从二十厘米射电天空的微弱图像(FIRST)测量的1.4 GHz通量密度估计。这使得我们不仅可以研究单个源,还可以使用中值叠加技术研究250 μm选定总体的平均特性。我们发现,在H-ATLAS和FIRST数据中的$\geq 5σ$处检测到的单个源具有与先前的FIRC研究一致的对数通量比(即FIRC $q_λ$参数)。相比之下,堆叠值显示更大的$q_λ$,表明250μm选定光源的远红外通量密度/亮度高于之前分析中观察到的值。此外,我们发现证据表明,250 μm的源与温暖的尘埃SED有一个更大的1.4 GHz的亮度比我们的样品中的冷源。虽然我们没有发现单色FIRC的红移演化的证据,我们的分析揭示了显着的温度依赖性。虽然FIRC在100 μm处随温度变化相当恒定,但随着我们探测更长的PACS和SPIRE波长,我们发现与温度的负相关性增加。这些结果可能有重要的影响,使用单色尘埃光度作为恒星形成星系的恒星形成率指标,并在未来,使用无线电数据来确定星系恒星形成率。

英文摘要:

We use 10,387 galaxies from the Herschel Astrophysical TeraHertz Large Area Survey (H-ATLAS) to probe the far-infrared radio correlation (FIRC) of star forming galaxies as a function of redshift, wavelength, and effective dust temperature. All of the sources in our 250 μm-selected sample have spectroscopic redshifts, as well as 1.4 GHz flux density estimates measured from the Faint Images of the Radio Sky at Twenty centimetres (FIRST) survey. This enables us to study not only individual sources, but also the average properties of the 250 μm selected population using median stacking techniques. We find that individual sources detected at $\geq 5σ$ in both the H-ATLAS and FIRST data have logarithmic flux ratios (i.e. FIRC $q_λ$ parameters) consistent with previous studies of the FIRC. In contrast, the stacked values show larger $q_λ$, suggesting excess far-IR flux density/luminosity in 250μm selected sources above what has been seen in previous analyses. In addition, we find evidence that 250 μm sources with warm dust SEDs have a larger 1.4 GHz luminosity than the cooler sources in our sample. Though we find no evidence for redshift evolution of the monochromatic FIRC, our analysis reveals significant temperature dependence. Whilst the FIRC is reasonably constant with temperature at 100 μm, we find increasing inverse correlation with temperature as we probe longer PACS and SPIRE wavelengths. These results may have important implications for the use of monochromatic dust luminosity as a star formation rate indicator in star-forming galaxies, and in the future, for using radio data to determine galaxy star formation rates.

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