论文标题

分子吸收线对hyda-a的AGN的调查

A molecular absorption line survey toward the AGN of Hydra-A

论文作者

Rose, Tom, Edge, A. C., Combes, F., Hamer, S., McNamara, B. R., Russell, H., Gaspari, M., Salomé, P., Sarazin, C., Tremblay, G. R., Baum, S. A., Bremer, M. N., Donahue, M., Fabian, A. C., Ferland, G., Nesvadba, N., O'Dea, C., Oonk, J. B. R., Peck, A. B.

论文摘要

我们提出了Atacama大型毫米/亚毫米阵列的观测值,最明亮的星系hydra-A,附近的($ z = 0.054 $)巨型椭圆星系,带有功能强大且扩展的无线电喷气机。观察结果揭示了CO(1-0),CO(2-1),$^{13} $ CO(2-1),CN(2-1),SIO(5-4),HCO $^{+} $(1-0),HCO $ $^{+} {+} $(2-1)$(2-1),HCN(1-0),HCN(1-0),HCN(1-1),HNC(2-1),HNC(1-0),和(1-0),和(1-0),和(1-0),和(1-0)和H $ _ {2} $ CO(3-2)吸收线,针对星系的明亮而紧凑的活性银核。这些吸收特征是由于至少12个单独的分子云,它们靠近星系中心,相对于其衰退速度,速度约为$ -50 $ -50 $至$+10 $ km/s,正值对应于向内运动。吸收曲线是最亮的簇星系中块状星体介质的证据,该星系星系由具有相似的柱密度,速度分散体和激发温度的云层组成,与在银河系中的几个KPC处发现的云层组成。我们还显示了在两年的时间范围内的$ \ sim 10 $ km/s宽部分的宽部分,很可能是由于连续源热点的相对论动作引起的,从而改变了吸收云的背景。

We present Atacama Large Millimeter/submillimeter Array observations of the brightest cluster galaxy Hydra-A, a nearby ($z=0.054$) giant elliptical galaxy with powerful and extended radio jets. The observations reveal CO(1-0), CO(2-1), $^{13}$CO(2-1), CN(2-1), SiO(5-4), HCO$^{+}$(1-0), HCO$^{+}$(2-1), HCN(1-0), HCN(2-1), HNC(1-0) and H$_{2}$CO(3-2) absorption lines against the galaxy's bright and compact active galactic nucleus. These absorption features are due to at least 12 individual molecular clouds which lie close to the centre of the galaxy and have velocities of approximately $-50$ to $+10$ km/s relative to its recession velocity, where positive values correspond to inward motion. The absorption profiles are evidence of a clumpy interstellar medium within brightest cluster galaxies composed of clouds with similar column densities, velocity dispersions and excitation temperatures to those found at radii of several kpc in the Milky Way. We also show potential variation in a $\sim 10$ km/s wide section of the absorption profile over a two year timescale, most likely caused by relativistic motions in the hot spots of the continuum source which change the background illumination of the absorbing clouds.

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