斯巴鲁-XMM-牛顿深度勘测(SXDS)VIII .:X射线源的多波长鉴别、光学/近红外光谱特性和光度红移
The Subaru-XMM-Newton Deep Survey (SXDS) VIII.: Multi-wavelength Identification, Optical/NIR Spectroscopic Properties, and Photometric Redshifts of X-ray Sources
摘要:
本文报道了利用Subaru-XMM-Newton深度调查(SXDS)中发现的X射线源的多波长识别。我们利用覆盖了远紫外到中红外波长范围的深度成像数据,通过对R波段、3.6微米、近紫外、近红外、近红外和远红外波段的探测数据应用似然比方法来选择每个X射线源的主要对应源。和24微米源星表以及在1.4GHz射电和i '波段变率巡天中选出的活动星系核候选者的匹配星表。一旦除去银河系恒星、附近星系中的超亮X射线源和星系团的候选者,样本中就有896个活动星系核候选者。我们利用光学和近红外多目标光谱仪对活动星系核进行了光谱观测,发现了65%的活动星系核候选者的X射线光谱。对于其余的X射线活动星系核候选者,我们用15个波段的光度数据估算了它们的光度红移。利用大样本的X射线选择活动星系核的多波长光度数据,我们估算了窄线活动星系核的宿主星系的恒星质量M*。恒星质量的分布在z=0.1到4.0之间是非常恒定的。M* 与2- 10 keV光度的关系可用黑洞质量与M* 关系的强宇宙学演化来解释。我们还评估了X射线活动星系核的紫外-中红外光谱能量分布(SED)的散射作为X射线亮度和吸收到核的函数。散射进行了比较与星系的红移和恒星质量分布与X射线活动星系核相匹配。被遮蔽的X射线活动星系核的紫外-近红外辐射强度与匹配样品中的星系相似。在近红外-中红外波段,X射线活动星系核的中位散射强度较红,但匹配样本中X射线活动星系核的散射强度与星系的散射强度大致重叠。
英文摘要:
We report the multi-wavelength identification of the X-ray sources found in the Subaru-XMM-Newton Deep Survey (SXDS) using deep imaging data covering the wavelength range between the far-UV to the mid-IR. We select a primary counterpart of each X-ray source by applying the likelihood ratio method to R-band, 3.6micron, near-UV, and 24micron source catalogs as well as matching catalogs of AGN candidates selected in 1.4GHz radio and i'-band variability surveys. Once candidates of Galactic stars, ultra-luminous X-ray sources in a nearby galaxy, and clusters of galaxies are removed there are 896 AGN candidates in the sample. We conduct spectroscopic observations of the primary counterparts with multi-object spectrographs in the optical and NIR; 65\% of the X-ray AGN candidates are spectroscopically-identified. For the remaining X-ray AGN candidates, we evaluate their photometric redshift with photometric data in 15 bands. Utilising the multi-wavelength photometric data of the large sample of X-ray selected AGNs, we evaluate the stellar masses, M*, of the host galaxies of the narrow-line AGNs. The distribution of the stellar mass is remarkably constant from z=0.1 to 4.0. The relation between M* and 2--10 keV luminosity can be explained with strong cosmological evolution of the relationship between the black hole mass and M*. We also evaluate the scatter of the UV-MIR spectral energy distribution (SED) of the X-ray AGNs as a function of X-ray luminosity and absorption to the nucleus. The scatter is compared with galaxies which have redshift and stellar mass distribution matched with the X-ray AGN. The UV-NIR SEDs of obscured X-ray AGNs are similar to those of the galaxies in the matched sample. In the NIR-MIR range, the median SEDs of X-ray AGNs are redder, but the scatter of the SEDs of the X-ray AGN broadly overlaps that of the galaxies in the matched sample.
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