The LOFAR Two-metre Sky Survey: Deep Fields data release 1. V. Survey description, source classifications, and host galaxy properties
The LOFAR Two-metre Sky Survey: Deep Fields data release 1. V. Survey description, source classifications, and host galaxy properties
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LOFAR 两米巡天：深场数据发布 1. V. 巡天描述、源分类和宿主星系属性
DOI：
10.1093/mnras/stad1308
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发表时间：
2023
影响因子：
4.8
通讯作者：
Best P
中科院分区：
文献类型：
--
作者：
Best P
≈80 000射电源的源分类、恒星质量和恒星形成率来自低频阵列两米天文测量(LOTSS)深场的第一次数据发布，这是有史以来进行的最广泛的深度射电测量。利用从紫外线到远红外的深多波长数据，使用四种不同的光谱能量分布(SED)程序对所有LOTSS深宿主星系进行了光谱能量分布(SED)拟合，其中两种程序包括模拟活动星系核(AGN)的贡献。通过比较这四个代码的结果，确定了拥有辐射活动星系核的星系，并得出了每个星系的恒星质量和恒星形成率的优化一致估计。然后识别出射电辐射超过恒星形成时预期射电辐射的星系，并将LoTSS深源分为四类：恒星形成星系、射电安静活动星系核和射电响亮高激发和低激发活动星系核。95%的 源可以被可靠地归类，其中超过三分之二是恒星形成星系，从附近宇宙中的正常星系到z>；4的高度恒星爆发系统。恒星形成星系在≈1 mJy的150 MHz通量密度以下成为主要群体，占S150 MHz 100∼100μJy源的90%。无线电安静的AGN占总人口的10%≈ 。将结果与SKADS和T-RECS无线电天空模拟的预测结果进行了比较，并对模拟的改进提出了建议。
Source classifications, stellar masses, and star-formation rates are presented for ≈80 000 radio sources from the first data release of the Low Frequency Array Two-metre Sky Survey (LoTSS) Deep Fields, which represents the widest deep radio survey ever undertaken. Using deep multi-wavelength data spanning from the ultraviolet to the far-infrared, spectral energy distribution (SED) fitting is carried out for all of the LoTSS Deep host galaxies using four different SED codes, two of which include modelling of the contributions from an active galactic nucleus (AGN). Comparing the results of the four codes, galaxies that host a radiative AGN are identified, and an optimized consensus estimate of the stellar mass and star-formation rate for each galaxy is derived. Those galaxies with an excess of radio emission over that expected from star formation are then identified, and the LoTSS Deep sources are divided into four classes: star-forming galaxies, radio-quiet AGN, and radio-loud high-excitation and low-excitation AGN. Ninety-five per cent of the sources can be reliably classified, of which more than two-thirds are star-forming galaxies, ranging from normal galaxies in the nearby Universe to highly-starbursting systems atz> 4. Star-forming galaxies become the dominant population below 150-MHz flux densities of ≈1 mJy, accounting for 90 per cent of sources atS150MHz∼ 100μJy. Radio-quiet AGN comprise ≈10 per cent of the overall population. Results are compared against the predictions of the SKADS and T-RECS radio sky simulations, and improvements to the simulations are suggested.