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X-Ray Emission from the Nucleus of the Dwarf Elliptical Galaxy NGC 3226

机译:矮椭圆形星系NGC 3226的X射线发射

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We present the first high-resolution X-ray image of the dwarf elliptical galaxy NGC 3226. The data were obtained during an observation of the nearby Seyfert Galaxy NGC 3227 using the Chandra X-Ray Observatory. We detect a point X-ray source spatially consistent with the optical nucleus of NGC 3226 and a recently detected, compact, flat-spectrum radio source. The X-ray spectrum can be measured up to ~10 keV and is consistent with a power law with a photon index 1.7 Γ 2.2 or thermal bremsstrahlung emission with 4 keV kT 10 keV. In both cases, the luminosity in the 2-10 keV band 1040 h ergs s-1. We find marginal evidence that the nucleus varies within the observation. These characteristics support evidence from other wave bands that NGC 3226 harbors a low-luminosity active nucleus. We also comment on two previously unknown, fainter X-ray sources 15'' from the nucleus of NGC 3226. Their proximity to the nucleus (with projected distances of 1.3 h kpc) suggests both are within NGC 3226 and thus have luminosities (approximately a few times 1038 to a few times 1039 ergs s-1) consistent with black hole binary systems.
机译:我们展示了矮椭圆形星系NGC 3226的第一张高分辨率X射线图像。数据是使用钱德拉X射线天文台对附近的塞弗特银河NGC 3227进行观测的过程中获得的。我们检测到空间上与NGC 3226的光核一致的点X射线源,以及最近检测到的紧凑型,扁平频谱的无线电源。 X射线光谱可以测量到大约10 keV,并且与光子指数1.7Γ2.2的幂定律或4 keV kT 10 keV的热致辐射发射一致。在这两种情况下,2-10 keV波段1040 h的发光度均为s-1。我们发现边缘核在观察范围内变化。这些特性支持了其他波段的证据,即NGC 3226具有低发光活性核。我们还对来自NGC 3226原子核的两个先前未知的微弱X射线源15英寸进行了评论。它们与原子核的接近度(预计距离为1.3 h kpc)表明两者都在NGC 3226内,因此具有光度(大约a 1038到1039 ergs s-1的几次)与黑洞二进制系统一致。

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