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arXiv 0903.2233astro-ph.CO
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一个新的视类星体对:Q2225-403A,B

A new apparent quasar pair: Q2225-403A,B

R. Decarli, A. Treves, R. Falomo

摘要:

我们报告了一个先前未知的类星体的偶然发现,距离Q2225-403(z=2.410)10.5”。对MgII_2798的宽发射线和周围FeII多重谱线的观测表明,类星体的伴星位于z=0.932。Q2225-403的光谱显示了许多吸收线,最值得注意的是在与伴星相同红移处的MgII线,这表明我们正在探测距离更近的类星体约80 kpc的晕内的气体。从高分辨率的近红外图像中,我们能够分辨出这两个类星体的宿主星系。根据2dF巡天中已知的类星体表面密度,我们估计找到这样一对紧密的类星体的概率<1%。

英文摘要:

We report the serendipitous discovery of a previously unknown quasar at 10.5" from Q2225-403 (z=2.410). The observation of the broad emission line of MgII_2798 and of the surrounding FeII multiplets indicates that the companion quasar is at z=0.932. The spectrum of Q2225-403 shows a number of absorption lines, the most noteworthy is the MgII line at the same redshift of the companion, suggesting that we are probing the gas within the halo ~80 kpc from the closer quasar. From high resolution NIR images we were able to resolve the host galaxies of the two quasars. Basing on the known surface density of quasars in the 2dF survey we estimate that the probability of finding such a close pair is < ~1 per cent.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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