A molecular absorption line survey towards the AGN of Hydra-A
A molecular absorption line survey towards the AGN of Hydra-A
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DOI：
10.1093/mnras/staa1474
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发表时间：
2020-05
影响因子：
4.8
通讯作者：
T. Rose;A. Edge;F. Combes;S. Hamer;B. McNamara;H. Russell;M. Gaspari;P. Salom'e;C. Sarazin;G. Tremblay;S. Baum;M. Bremer;M. Donahue;A. Fabian;G. Ferland;N. Nesvadba;C. O’Dea;J. Oonk;A. Peck
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文献类型：
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作者：
T. Rose;A. Edge;F. Combes;S. Hamer;B. McNamara;H. Russell;M. Gaspari;P. Salom'e;C. Sarazin;G. Tremblay;S. Baum;M. Bremer;M. Donahue;A. Fabian;G. Ferland;N. Nesvadba;C. O’Dea;J. Oonk;A. Peck
我们目前阿塔卡马大毫米/亚毫米阵列观测最明亮的集群星系Hydra-A，附近（z = 0.054）巨大的椭圆星系与强大的和扩展的无线电射流。观测结果显示，该星系明亮致密的活动星系核有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）和H2 CO（3-2）的吸收线。这些吸收特征是由于至少12个独立的分子云靠近星系中心，相对于其后退速度，其速度约为−50至+10 km s−1，其中正值对应于向内运动。的吸收剖面是一个cluerous星际介质内最明亮的星系团的云组成的云具有类似的柱密度，速度色散，和激发温度的证据，在银河系中的几个千秒差距的半径。我们还显示了在2年时间尺度内，吸收轮廓的10 km s−1宽部分的潜在变化，最有可能是由连续源热点的相对论运动引起的，这些运动改变了吸收云的背景照明。
We present Atacama Large Millimetre/submillimetre 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), 13CO(2–1), CN(2–1), SiO(5–4), HCO+(1–0), HCO+(2–1), HCN(1–0), HCN(2–1), HNC(1–0), and H2CO(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 that lie close to the centre of the galaxy and have velocities of approximately −50 to +10 km s−1 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 ∼10 km s−1 wide section of the absorption profile over a 2 yr time-scale, most likely caused by relativistic motions in the hot spots of the continuum source that change the background illumination of the absorbing clouds.