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首页> 外文期刊>The Astrophysical journal >A CANDIDATE OF A TYPE 2 QUASI-STELLAR OBJECT AT z = 0.9: LARGE X-RAY ABSORPTION WIT A STRONG BROAD Hα EMISSION LINE
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A CANDIDATE OF A TYPE 2 QUASI-STELLAR OBJECT AT z = 0.9: LARGE X-RAY ABSORPTION WIT A STRONG BROAD Hα EMISSION LINE

机译：z = 0.9时的2型准恒星物体的候选者：大型X射线吸收率长于一条坚固的宽Hα发射线

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摘要

Deep hard X-ray and near-infrared observations of a type 2 radio-quiet quasi-stellar object (QSO) candidate at z = 0.9, AX J08494 + 4454, are reported. The 0.5-10 keV Chandra X-Ray Observatory spectrum of AX J08494 + 4454 is hard and is explained well with a power-law continuum absorbed by a hydrogen column density of (2.3 +- 1.1) x 10~(23) cm~(-2). The 2-10 keV luminosity of the object is estimated to be 7.2_(-2.0)~(+3.6) x 10~(44) ergs s~(-1), after correcting the absorption, and reaches hard X-ray luminosities of QSOs. The large X-ray absorption and the large intrinsic luminosity support the original identification of AX J08494 + 4454 as a type 2 radio-quiet QSO. Nevertheless, the deep Subaru/IRCS J-band spectro-scopic observation suggests the presence of a strong broad Hα emission line from AX J08494 + 4454. If real, the broad Hα emission line has a velocity width of 9400 +- 1000 km s~(-1), which corresponds to a typical broad Balmer line velocity width of a luminous QSO. The existence of the strong broad Ha line means that the object is not a type 2 QSO but a luminous cousin of a Seyfert 1.9 galaxy in the source-frame optical spectrum. The Balmer decrement of broad lines and the broad Hα emission to the hard X-ray luminosity ratio suggest that the nucleus is affected by dust extinction with an A_V of 1-3 mag in the optical wavelength. Optical colors and faint optical magnitudes of AX J08494 + 4454 are consistent with the model. The estimated amount of dust extinction is much smaller than that expected from the X-ray column density (A_V = 130 +- 60 mag).
机译：据报道，在z = 0.9（AX J08494 + 4454）时，对第2类放射性静准星体（QSO）候选物进行了深硬X射线和近红外观测。 AX J08494 + 4454的0.5-10 keV Chandra X射线天文台光谱很硬，并且可以通过（2.3 +-1.1）x 10〜（23）cm〜（ -2）。校正吸收后，物体的2-10 keV光度估计为7.2 _（-2.0）〜（+3.6）x 10〜（44）ers s〜（-1），并达到硬X射线光度QSO。较大的X射线吸收和较大的固有发光度支持AX J08494 + 4454作为2型无线电静音QSO的原始标识。尽管如此，对Subaru / IRCS J波段的深光谱观察表明，存在来自AX J08494 + 4454的强宽Hα发射谱线。如果真实存在，则宽Hα发射谱线的速度宽度为9400 +-1000 km s〜 （-1），它对应于发光QSO的典型宽Balmer线速度宽度。强Ha宽线条的存在意味着该对象不是源框架光谱中的Seyfert 1.9星系的近亲，不是2型QSO。宽线的巴尔默减量和宽的Hα发射与硬X射线光度比表明，原子核受到消光尘埃的影响，该消光尘埃的光波长为1-3 mag。 AX J08494 + 4454的光学颜色和微弱的光学幅度与该型号一致。估计的粉尘消灭量比X射线柱密度所预期的要小得多（A_V = 130 + -60 mag）。

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