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arXiv 0708.0982astro-ph
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Subaru/XMM-Newton深场中z~0.5的低功率射电星系环境

Low-power radio galaxy environments in the Subaru/XMM-Newton Deep Field at z~0.5

J. E. Geach, C. Simpson, S. Rawlings, A. M. Read, M. Watson

摘要:

我们介绍了在Subaru/XMM-Newton Deep Field中选取的四个z~0.5的低功率(L_1.4 GHz < 10^25 W/Hz)射电星系的直接(Mpc尺度)环境中星系的多目标光谱。利用这些谱计算了射电星系群的速度色散和中心红移,并结合XMM-Newton(0.3-10 keV)X射线观测研究了L_X-sigma_v和T_X-sigma_v的标度关系。所有的射电星系都居住在中等丰富的星系群中--介于贫星系群和富星系群之间的中间环境,具有非常相似的X射线特性。我们集中讨论我们最好的统计例子,我们解释为一个低功率(FRI)源在一个子组内触发,这反过来又与附近的星系群相互作用,包含系统的大部分X射线发射-一个基本的场景,可以与高(z>4)和低(z<0.1)红移的更强大的射电源进行比较。这表明由星系团合并引发的星系-星系相互作用可能在射电星系的生命周期中起着重要的作用。

英文摘要:

We present multi-object spectroscopy of galaxies in the immediate (Mpc-scale) environments of four low-power (L_1.4 GHz < 10^25 W/Hz) radio galaxies at z~0.5, selected from the Subaru/XMM-Newton Deep Field. We use the spectra to calculate velocity dispersions and central redshifts of the groups the radio galaxies inhabit, and combined with XMM-Newton (0.3-10 keV) X-ray observations investigate the L_X--sigma_v and T_X--sigma_v scaling relationships. All the radio galaxies reside in moderately rich groups -- intermediate environments between poor groups and rich clusters, with remarkably similar X-ray properties. We concentrate our discussion on our best statistical example that we interpret as a low-power (FRI) source triggered within a sub-group, which in turn is interacting with a nearby group of galaxies, containing the bulk of the X-ray emission for the system -- a basic scenario which can be compared to more powerful radio sources at both high (z>4) and low (z<0.1) redshifts. This suggests that galaxy-galaxy interactions triggered by group mergers may play an important role in the life-cycle of radio galaxies at all epochs and luminosities.

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