The 2-24 μm source counts from the AKARI North Ecliptic Pole survey

The 2-24 μm source counts from the AKARI North Ecliptic Pole survey
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AKARI 黄道北极调查的 2-24 μm 源计数

DOI:
10.1093/mnras/stu1617
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发表时间:
2014
影响因子:
4.8
通讯作者:
T.
T.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Murata;K.; Pearson;C. P.; Goto;T.; Kim;S. J.; Matsuhara;H.; Wada;T.

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本文根据AKARI北黄道极观测资料,给出了2-24 μ米范围内九个带的星系数统计。这些数字来自NEP深度调查和NEP全范围调查,调查范围分别为0.5度和5.8度。为了产生可靠的数字计数,从最近更新的图像中提取了来源。通过蒙特卡罗模拟对观测震级和本征震级的完整性和差异进行了修正。用光学数据估计的恒星分数减去恒星计数。得到的源计数降至80% %的完备性限制;在2.4、3.2、4.1、7、9、11、15、18和24个μm波段中,分别为0.18、0.16、0.10、0.05、0.06、0.10、0.15、0.16和0.44mJy。在所有波段的亮面,计数分布是平坦的,与欧几里得宇宙一致,而在暗面,计数偏离,表明遥远宇宙的星系群正在演化。这些结果与之前类似波段的星系计数基本一致。我们还将我们的计算结果与进化模型进行了比较,发现它们非常吻合。通过将模型整合到80% 的完整性限制,我们计算出AKARINEP调查旋转了20%-50%的宇宙红外背景,具体取决于波段。
We present herein galaxy number counts of the nine bands in the 2–24 μm range on the basis of theAKARINorth Ecliptic Pole (NEP) surveys. The number counts are derived from NEP-deep and NEP-wide surveys, which cover areas of 0.5 and 5.8 deg2, respectively. To produce reliable number counts, the sources were extracted from recently updated images. Completeness and difference between observed and intrinsic magnitudes were corrected by Monte Carlo simulation. Stellar counts were subtracted by using the stellar fraction estimated from optical data. The resultant source counts are given down to the 80 per cent completeness limit; 0.18, 0.16, 0.10, 0.05, 0.06, 0.10, 0.15, 0.16 and 0.44 mJy in the 2.4, 3.2, 4.1, 7, 9, 11, 15, 18 and 24 μm bands, respectively. On the bright side of all bands, the count distribution is flat, consistent with the Euclidean universe, while on the faint side, the counts deviate, suggesting that the galaxy population of the distant universe is evolving. These results are generally consistent with previous galaxy counts in similar wavebands. We also compare our counts with evolutionary models and find them in good agreement. By integrating the models down to the 80 per cent completeness limits, we calculate that theAKARINEP survey revolves 20–50 per cent of the cosmic infrared background, depending on the wavebands.
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