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The Spiral Host Galaxy of the Double Radio Source 0313?192*

机译:双无线电源的螺旋宿主星系0313?192 *

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We present new Hubble Space Telescope (HST), Gemini South, and Chandra observations of the radio galaxy 0313-192, which hosts a 350 kpc double source and jets, even though previous data have suggested that it is a spiral galaxy. We measure the bulge scale and the luminosity, radial, and vertical profiles of disk starlight and consider the distributions of H II regions and absorbing dust. In each case the HST data confirm its classification as an edge-on spiral galaxy, the only such system known to produce such an extended radio source of this kind. The Gemini near-IR images and Chandra spectral fit reveal a strongly obscured central active galactic nucleus (AGN), seen through the entire interstellar medium path length of the disk and showing X-ray evidence of additional absorption from warm or dense material close to the central object. We consider several possible mechanisms for producing such a rare combination of AGN and host properties, some combination of which may be at work. These include an unusually luminous bulge (suggesting a black hole of mass ~8 × 108 M⊙), the orientation of the jets near the pole of the gas-rich disk, and some evidence of a weak gravitational interaction that has warped the disk and could have enhanced fueling of the central engine. We detect an X-ray counterpart of the kiloparsec-scale radio jet emerging to the south; jet/counterjet limits on both radio and X-ray regimes allow them to be symmetric if seen more than 15° from the plane of the sky, still consistent with the jet axes being within ~30° of the poles of the gas-rich galaxy disk. A linear or disklike emission-line structure is seen around the nucleus, inclined by ~20° to the stellar disk but nearly perpendicular to the jets; this may represent the aftermath of a galaxy encounter, in which gas is photoionized by a direct view of the nuclear continuum.
机译:我们提供了新的哈勃太空望远镜(HST),双子座南和钱德拉对射电星系0313-192的观测,该星系拥有350 kpc双源和射流,即使先前的数据表明它是旋涡星系。我们测量了圆盘星光的凸出比例和光度,径向和垂直剖面,并考虑了H II区的分布和吸收灰尘。在每种情况下,HST数据都将其分类为边缘螺旋星系,这是唯一已知的产生此类扩展无线电源的系统。双子座的近红外图像和钱德拉光谱拟合显示,在整个盘状星际介质的整个路径长度上观察到的中央活跃银河核(AGN)都被强烈遮盖,并显示了X射线证据,表明靠近该区域的温暖或稠密物质有额外的吸收。中心对象。我们考虑了产生这种罕见的AGN和宿主特性组合的几种可能的机制,其中某些组合可能正在起作用。其中包括异常发光的隆起(建议黑洞的质量为〜8×108M⊙),靠近富气磁盘极点的射流方向以及一些弱的引力相互作用使磁盘弯曲的证据。可能会增加中央发动机的加油量。我们检测到出现在南部的千帕级无线电射流的X射线对应物;射电/反射流限制在射电和X射线范围内都可以使它们对称(如果与天空平面的夹角超过15°,则仍与射流轴位于富含气体的星系的极点之间约30°以内)一致磁盘。在原子核周围可见线性或盘状发射线结构,相对于恒星盘倾斜约20°,但几乎垂直于射流。这可能代表了星系相遇的后果,其中气体通过直接观察核连续体而被光电离。

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