INTEGRAL/IBIS深河外巡天：M81、LMC和3C 273/Coma场
INTEGRAL/IBIS deep extragalactic survey: M81, LMC and 3C 273/Coma fields
摘要：
我们提出了三个河外场，M81（9.7 Ms的曝光），LMC（6.8 Ms）和3C 273/后发座（9.3 Ms），在硬X射线（17-60 keV）能量带与IBIS望远镜板载的INTEGRAL天文台，基于12年的观测结果（2003-2015）。组合测量达到0.18 mCrab的$4σ$峰值灵敏度（2.6 $\times$ 10 $^{-12}$ erg s $^{-1}$ cm $^{-2}$），并且在4900 deg $^{2}$的10%和90%的其全面积上的灵敏度分别好于0.25和0.87 mCrab。我们在$S/N>4σ$上共探测到147个源，其中37个源是首次在硬X射线中观测到的。调查主要是河外源，主要是活动星系核（AGN）。已识别源的样本包含98个活动星系核（包括64个Seyfert星系，7个LINER，3个XBONG，16个耀变体和8个光学类别不清楚的AGN），两个星系团（Coma和Abell 3266），位于大麦哲伦星云和小麦哲伦星云的17个天体（13个高质量和2个低质量X射线双星和2个X射线双星），3个银河系激变变星，1个超亮X射线源（ULX，M82 X-1）和一个混合源（SWIFT J1105.7+5854）。25个放射源的性质仍然不明，因此，调查目前已完成83%的鉴定工作。我们建立了活动星系核数-流量关系（$\log{N}$ - $\log{S}$），计算了整个巡天和三个河外星系场中的活动星系核数密度。
英文摘要：
We present results of deep surveys of three extragalactic fields, M81 (exposure of 9.7 Ms), LMC (6.8 Ms) and 3C 273/Coma (9.3 Ms), in the hard X-ray (17-60 keV) energy band with the IBIS telescope onboard the INTEGRAL observatory, based on 12 years of observations (2003-2015). The combined survey reaches a $4σ$ peak sensitivity of 0.18 mCrab (2.6$\times$10$^{-12}$ erg s$^{-1}$ cm$^{-2}$) and sensitivity better than 0.25 and 0.87 mCrab over 10% and 90% of its full area of 4900 deg$^{2}$, respectively. We have detected in total 147 sources at $S/N>4σ$, including 37 sources observed in hard X-rays for the first time. The survey is dominated by extragalactic sources, mostly by active galactic nuclei (AGN). The sample of identified sources contains 98 AGN (including 64 Seyfert galaxies, 7 LINERs, 3 XBONGs, 16 blazars and 8 AGN of unclear optical class), two galaxy clusters (Coma and Abell 3266), 17 objects located in the Large and Small Magellanic Clouds (13 high- and 2 low-mass X-ray binaries and 2 X-ray pulsars), three Galactic cataclysmic variables, one ultraluminous X-ray source (ULX, M82 X-1) and one blended source (SWIFT J1105.7+5854). The nature of 25 sources remains unknown, so that the surveys identification is currently complete at 83%. We have constructed AGN number-flux relations ($\log{N}$-$\log{S}$) and calculated AGN number densities in the local Universe for the entire survey and for each of the three extragalactic fields.
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