THE NuSTAR EXTRAGALACTIC SURVEYS: OVERVIEW AND CATALOG FROM THE COSMOS FIELD
THE NuSTAR EXTRAGALACTIC SURVEYS: OVERVIEW AND CATALOG FROM THE COSMOS FIELD
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DOI：
10.1088/0004-637x/808/2/185
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发表时间：
2015-08
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通讯作者：
F. Civano;F. Civano;F. Civano;R. Hickox;S. Puccetti;A. Comastri;J. Mullaney;L. Zappacosta;S. LaMassa;J. Aird;J. Aird;D. Alexander;D. Ballantyne;F. Bauer;F. Bauer;F. Bauer;W. Brandt;S. Boggs;F. Christensen;W. Craig;W. Craig;A. Del-Moro;M. Elvis;K. Forster;P. Gandhi;P. Gandhi;B. Grefenstette;C. Hailey;F. Harrison;G. Lansbury;B. Luo;B. Luo;K. Madsen;C. Saez;D. Stern;E. Treister;M. Urry;D. Wik;Will Zhang
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作者：
F. Civano;F. Civano;F. Civano;R. Hickox;S. Puccetti;A. Comastri;J. Mullaney;L. Zappacosta;S. LaMassa;J. Aird;J. Aird;D. Alexander;D. Ballantyne;F. Bauer;F. Bauer;F. Bauer;W. Brandt;S. Boggs;F. Christensen;W. Craig;W. Craig;A. Del-Moro;M. Elvis;K. Forster;P. Gandhi;P. Gandhi;B. Grefenstette;C. Hailey;F. Harrison;G. Lansbury;B. Luo;B. Luo;K. Madsen;C. Saez;D. Stern;E. Treister;M. Urry;D. Wik;Will Zhang
为了提供对10千电子伏以上的X射线背景峰值的贡献源的普查，核光谱望远镜阵列（努斯塔）正在使用三层“婚礼蛋糕”方法进行河外勘测。我们提出了努斯塔调查的COSMOS领域，中等灵敏度，中等面积层，覆盖1.7度2和重叠的钱德拉和XMM-牛顿数据。这项调查包括121个观察，总暴露量为103 ms。为了充分利用这些数据，我们开发了一种新的检测策略，通过广泛的模拟进行了仔细测试。在20%的完整性下，测量灵敏度分别为5.9、2.9和6.4 × 10−14 erg cm − 2 s − 1？分别在3-24、3-8和8-24 keV波段。通过结合检测在3个波段，我们有一个样本的91个努斯塔源1042-1045.5尔格s-1？>光度和红移z = 0.04-2.5。在8-24 keV波段检测到32个源，其通量比Swift-BAT检测到的源弱100倍。在91个探测中，除了4个以外，所有的都与钱德拉和/或XMM-牛顿点相对应。一个源与扩展的较低能量X射线源相关联。我们提出了X射线（硬度比和光度）和光学X射线特性。观测到的候选康普顿厚度的活动星系核的硬度比测量的分数在13%-20%之间。我们讨论了努斯塔J100259+0220.6（ID 330）在z = 0.044处的光谱性质，在整个样品中具有最高的硬度比。测得的柱密度超过1024 cm−2，意味着源的厚度是康普顿厚度。在没有>10 keV数据的情况下，该源先前未被识别为这样。
To provide the census of the sources contributing to the X-ray background peak above 10 keV, Nuclear Spectroscopic Telescope Array (NuSTAR) is performing extragalactic surveys using a three-tier “wedding cake” approach. We present the NuSTAR survey of the COSMOS field, the medium sensitivity, and medium area tier, covering 1.7 deg2 and overlapping with both Chandra and XMM-Newton data. This survey consists of 121 observations for a total exposure of ∼3 Ms. To fully exploit these data, we developed a new detection strategy, carefully tested through extensive simulations. The survey sensitivity at 20% completeness is 5.9, 2.9, and 6.4 × 10−14 erg cm − 2 s − 1 ?> in the 3–24, 3–8, and 8–24 keV bands, respectively. By combining detections in 3 bands, we have a sample of 91 NuSTAR sources with 1042–1045.5 erg s − 1 ?> luminosities and redshift z = 0.04–2.5. Thirty-two sources are detected in the 8–24 keV band with fluxes ∼100 times fainter than sources detected by Swift-BAT. Of the 91 detections, all but 4 are associated with a Chandra and/or XMM-Newton point-like counterpart. One source is associated with an extended lower energy X-ray source. We present the X-ray (hardness ratio and luminosity) and optical-to-X-ray properties. The observed fraction of candidate Compton-thick active galactic nuclei measured from the hardness ratio is between 13%–20%. We discuss the spectral properties of NuSTAR J100259+0220.6 (ID 330) at z = 0.044, with the highest hardness ratio in the entire sample. The measured column density exceeds 1024 cm−2, implying the source is Compton-thick. This source was not previously recognized as such without the >10 keV data.