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首页> 外文期刊>The Astrophysical journal >LOCALIZING INTEGRAL SOURCES WITH CHANDRA: X-RAY AND MULTI-WAVELENGTH IDENTIFICATIONS AND ENERGY SPECTRA
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LOCALIZING INTEGRAL SOURCES WITH CHANDRA: X-RAY AND MULTI-WAVELENGTH IDENTIFICATIONS AND ENERGY SPECTRA

机译:使用CHANDRA定位积分源:X射线和多波长识别和能量谱

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摘要

We report on Chandra observations of 18 hard X-ray (20?keV) sources discovered with the INTEGRAL satellite near the Galactic plane. For 14 of the INTEGRAL sources, we have uncovered one or two potential Chandra counterparts per source. These provide soft X-ray (0.3-10?keV) spectra and subarcsecond localizations, which we use to identify counterparts at other wavelengths, providing information about the nature of each source. Despite the fact that all of the sources are within 5° of the plane, four of the IGR sources are active galactic nuclei (AGNs; IGR?J01545+6437, IGR?J15391-5307, IGR?J15415-5029, and IGR?J21565+5948) and four others are likely AGNs (IGR?J03103+5706, IGR?J09189-4418, IGR?J16413-4046, and IGR?J16560-4958) based on each of them having a strong IR excess and/or extended optical or near-IR emission. We compare the X-ray and near-IR fluxes of this group of sources to those of AGNs selected by their 2-10?keV emission in previous studies and find that these IGR?AGNs are in the range of typical values. There is evidence in favor of four of the sources being Galactic (IGR?J12489-6243, IGR?J15293-5609, IGR?J16173-5023, and IGR?J16206-5253), but only IGR?J15293-5609 is confirmed as a Galactic source as it has a unique Chandra counterpart and a parallax measurement from previous optical observations that puts its distance at 1.56 ± 0.12?kpc. The 0.3-10?keV luminosity for this source is (1.4+1.0 – 0.4) × 1032?erg?s–1, and its optical/IR spectral energy distribution is well described by a blackbody with a temperature of 4200-7000?K and a radius of 12.0-16.4 R ☉. These values suggest that IGR?J15293-5609 is a symbiotic binary with an early K-type giant and a white dwarf accretor. We also obtained likely Chandra identifications for IGR?J13402-6428 and IGR?J15368-5102, but follow-up observations are required to constrain their source types.
机译:我们报告钱德拉观察到银河系平面附近的INTEGRAL卫星发现的18个硬X射线(> 20?keV)源的情况。对于14个INTEGRAL来源,我们每个来源都发现了一两个潜在的Chandra对应物。这些提供了软X射线(0.3-10?keV)光谱和亚秒级的定位,我们可以用来识别其他波长的对应物,从而提供有关每个光源性质的信息。尽管所有辐射源均位于飞机平面的5°以内,但其中四个IGR辐射源是活跃的银河核(AGN; IGR?J01545 + 6437,IGR?J15391-5307,IGR?J15415-5029和IGR?J21565 +5948)和其他四个可能的AGN(IGR?J03103 + 5706,IGR?J09189-4418,IGR?J16413-4046和IGR?J16560-4958),因为它们每个都有强烈的IR过量和/或扩展光学或近红外发射。我们将这组放射源的X射线和近红外通量与2-10?keV发射所选择的AGN的X射线和近红外通量进行比较,发现这些IGR?AGN在典型值范围内。有证据表明有四个来源是银河系(IGR?J12489-6243,IGR?J15293-5609,IGR?J16173-5023和IGR?J16206-5253),但只有IGR?J15293-5609被确认为银河源具有独特的Chandra对应物和先前光学观测的视差测量结果,其距离为1.56±0.12?kpc。此光源的0.3-10?keV发光度为(1.4 + 1.0 – 0.4)×1032?erg?s-1,其光学/红外光谱能量分布由温度为4200-7000?K的黑体很好地描述。半径为12.0-16.4 R☉。这些值表明IGR?J15293-5609是一种共生双星,具有早期的K型巨人和白矮星。我们还获得了可能用于IGR?J13402-6428和IGR?J15368-5102的钱德拉(Chandra)鉴定,但需要后续观察来限制其来源类型。

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