Mapping the ionised gas around the luminous QSO HE 1029-1401: evidence for minor merger events?

Mapping the ionised gas around the luminous QSO HE 1029-1401: evidence for minor merger events?
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绘制发光 QSO HE 1029-1401 周围的电离气体图:小型合并事件的证据?

DOI:
10.1051/0004-6361/201014559
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发表时间:
2010
影响因子:
6.5
通讯作者:
Wisotzki
Wisotzki
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Husemann;Sánchez;Wisotzki

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我们展示了南方天空 HE 1029-1401 上最亮的无线电静默 QSO 的 VIMOS 积分场光谱,红移为 z= 0.086。宽带成像的标准分解技术已扩展到积分场数据,以便消除 QSO 和主体发射的混合。我们对恒星连续体进行了初步分析,发现了年轻的恒星种群(<100 Myr)或嵌入古老恒星种群(10 Gyr)中的无特征连续体,这是大质量椭圆星系的典型特征。恒星速度色散σ*= 320±90 km s-1和估计的黑洞质量日志(MBH/) = 8.7±0.3与误差范围内的局部MBH-σ*关系一致。我们首次绘制了 HE 1029-1401 周围的二维电离气体分布和气体速度场图。虽然恒星宿主形态是纯椭圆形的,但我们发现从 QSO 到 16 kpc 的电离气体具有高度结构化的分布。该气体仅由 QSO 辐射高度电离,并且其金属丰度明显低于宿主恒星质量的预期,表明该气体的外部起源很可能是由于小型合并所致。我们在 QSO 周围发现了一个旋转气体盘,在中心 3 kpc 内发现了一个以色散为主的非旋转气体成分。在较大距离处,速度场受到严重干扰,这可以解释为过去小型合并事件的另一个特征。或者,电离气体中看到的弧状结构也可能表明存在大规模膨胀气泡,该气泡以活性核为中心,并可能由活性核驱动。
We present VIMOS integral field spectroscopy of the brightest radio-quiet QSO on the southern sky HE 1029-1401 at a redshift ofz= 0.086. Standard decomposition techniques for broad-band imaging are extended to integral field data in order to deblend the QSO and host emission. We perform a tentative analysis of the stellar continuum, finding a young stellar population (<100 Myr) or a featureless continuum embedded in an old stellar population (10 Gyr) typical for a massive elliptical galaxy. The stellar velocity dispersion ofσ*= 320±90 km s-1and the estimated black hole mass log(MBH/) = 8.7±0.3 are consistent with the localMBH–σ*relation within the errors. For the first time, we map the two-dimensional ionised gas distribution and the gas velocity field around HE 1029-1401. While the stellar host morphology is purely elliptical, we find a highly structured distribution of ionised gas out to 16 kpc from the QSO. The gas is highly ionised solely by the QSO radiation and has a significantly lower metallicity than would be expected for the stellar mass of the host, indicating an external origin of the gas most likely due to minor mergers. We find a rotating gas disc around the QSO and a dispersion-dominated non-rotating gas component within the central 3 kpc. At larger distances the velocity field is heavily disturbed, which could be interpreted as another signature of past minor merger events. Alternatively, the arc-like structure seen in the ionised gas might also be indicative of a large-scale expanding bubble, centred on and possibly driven by the active nucleus.
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