无线电-FIR相关性的近距离观察：解开恒星形成和AGN活动的贡献
A closer view of the radio-FIR correlation: disentangling the contributions of star formation and AGN activity
摘要：
我们扩展了统一无线电目录，一个由各种（NVSS，FIRST，WENSS，GB 6）无线电调查和SDSS检测到的源目录，通过将其与IRAS点和微弱源目录相匹配，将其扩展到IR波长。通过拟合每个NVSS选择的星系的NUV-NIR光谱能量分布（SED）与恒星星族合成模型，我们添加到目录恒星形成率，恒星质量和衰减。我们进一步添加有关NVSS选择的星系可用SDSS光谱的光发射线属性的信息。使用NVSS 20 cm（F_{1.4GHz} ge 2.5 mJy）选定样品，与SDSS光谱匹配（“主”星系和类星体）星表和红外天文卫星数据（0.04<z le 0.2）我们对各种类型星系的射电FIR相关性进行了深入分析，这些星系分为i）类星体，ii）恒星形成，iii）复合，iv）Seyfert，v）LINER和vi）使用标准光学光谱诊断工具的吸收线星系。我们利用基于SED的恒星形成率来独立地量化我们星系中的无线电和FIR发射源。我们的研究结果表明，塞弗特星系的FIR/无线电比低于，但仍然在分散的，规范值由于额外的（可能活动星系核）的贡献，他们的无线电连续辐射。此外，红外线检测到的吸收和LINER星系的平均强烈主导AGN活动在他们的FIR和无线电发射，但他们的平均FIR/无线电比是一致的，预期的恒星形成星系。总之，我们发现，在我们的NVSS-IRAS-SDSS样本中，大多数包含活动星系核的星系的FIR/射电通量比与定义射电FIR相关的恒星形成星系的FIR/射电通量比无法区分。因此，试图从恒星形成星系中分离出活动星系核，仅仅通过它们的远红外辐射/射电通量比，只能分离出一小部分活动星系核，比如射电大声的类星体。
英文摘要：
We extend the Unified Radio Catalog, a catalog of sources detected by various (NVSS, FIRST, WENSS, GB6) radio surveys, and SDSS, to IR wavelengths by matching it to the IRAS Point and Faint Source catalogs. By fitting each NVSS-selected galaxy's NUV-NIR spectral energy distribution (SED) with stellar population synthesis models we add to the catalog star formation rates, stellar masses, and attenuations.We further add information about optical emission line properties for NVSS-selected galaxies with available SDSS spectroscopy. Using an NVSS 20cm (F_{1.4GHz} ge 2.5mJy) selected sample, matched to the SDSS spectroscopic ("main" galaxy and quasar) catalogs and IRAS data (0.04<z le 0.2) we perform an in depth analysis of the radio-FIR correlation for various types of galaxies, separated into i) quasars, ii) star forming, iii) composite, iv) Seyfert, v) LINER and vi) absorption line galaxies using the standard optical spectroscopic diagnostic tools. We utilize SED-based star formation rates to independently quantify the source of radio and FIR emission in our galaxies. Our results show that Seyfert galaxies have FIR/radio ratios lower than, but still within the scatter of, the canonical value due to an additional (likely AGN) contribution to their radio continuum emission. Furthermore, IR-detected absorption and LINER galaxies are on average strongly dominated by AGN activity in both their FIR and radio emission; however their average FIR/radio ratio is consistent with that expected for star forming galaxies. In summary, we find that most AGN-containing galaxies in our NVSS-IRAS-SDSS sample have FIR/radio flux ratios indistinguishable from those of the star-forming galaxies that define the radio-FIR correlation. Thus, attempts to separate AGNs from star-forming galaxies by their FIR/radio flux ratios alone can separate only a small fraction of the AGNs, such as the radio-loud quasars.
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