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首页> 外文期刊>The Astrophysical journal >THE NATURE OF OPTICAL FEATURES IN THE INNER REGION OF THE 3C 48 HOST GALAXY
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THE NATURE OF OPTICAL FEATURES IN THE INNER REGION OF THE 3C 48 HOST GALAXY

机译：3C 48主机银河内部区域的光学特性

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摘要

The well-known quasar 3C 48 is the most powerful compact steep-spectrum radio-loud QSO at low redshifts. It also has two unusual optical features within the radius of the radio jet (～1″): (1) an anomalous, high-velocity narrow-line component, and (2) a bright continuum peak (3C 48A) ～1″ northeast of the quasar. Both of these optical features have been conjectured to be related to the radio jet. We have obtained Gemini North GMOS integral field unit (IFU) spectroscopy of the central region around 3C 48. We use the unique features of the IFU data to remove unresolved emission at the position of the quasar. The resolved emission at the wavelength of the high-velocity component is peaked approx < 0.25″ north of the quasar, at the same position angle as the base of the radio jet. These observations appear to confirm that this high-velocity gas is connected with the radio jet. However, most of the emission comes from a region where the jet is still well collimated, rather than from the regions where the radio maps indicate strong disruption. We also present the results of HST STIS spectroscopy of 3C 48A. We show that 3C 48A is dominated by stars with a luminosity-weighted age of ～1.4 x 10~8 yr, substantially older than any reasonable estimate for the age of the radio source. Thus, 3C 48A almost certainly cannot be attributed to jet-induced star formation. The host galaxy of 3C 48 is clearly the result of a merger, and 3C 48A seems much more likely to be the distorted nucleus of the merging partner in which star formation was induced during the previous close passage.
机译：著名的类星体3C 48是低红移下功能最强大的紧凑型陡峭频谱无线电QSO。在无线电射流的半径内（〜1”），它还具有两个不寻常的光学特征：（1）异常的高速窄线分量;（2）东北的一个明亮的连续峰（3C 48A）〜1”。类星体。这些光学特征都被推测与无线电射流有关。我们已经获得了3C 48周围中央区域的Gemini North GMOS积分场单元（IFU）光谱。我们使用IFU数据的独特功能来去除类星体位置处的未解析发射。在与无线电射流的基部相同的位置角处，在高速分量波长处解析的发射峰在类星体以北约<0.25“处达到峰值。这些观察结果似乎证实了这种高速气体与射流相连。但是，大多数发射来自射流仍保持良好准直的区域，而不是来自无线电地图显示强烈干扰的区域。我们还介绍了3C 48A的HST STIS光谱学结果。我们显示3C 48A由光度加权年龄为〜1.4 x 10〜8年的恒星控制，这比任何合理的无线电源年龄估计都大。因此，几乎可以肯定地将3C 48A归因于喷射诱发的恒星形成。 3C 48的宿主星系显然是合并的结果，而3C 48A似乎更可能是合并伙伴的扭曲核，在先前的近距离通过过程中诱导了恒星形成。

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