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arXiv 0807.0203astro-ph
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S5 0716+714星系的探测

Detection of the host galaxy of S5 0716+714

K. Nilsson, T. Pursimo, A. Sillanpää, L. O. Takalo, E. Lindfors

摘要:

我们已经获得了BL Lacertae对象S5 0716+714的深i波段图像,而目标处于低光学状态。由于星系核的微弱,我们能够探测到其下的宿主星系。主星系的I波段星等为17.5 ± 0.5,有效半径为(2.7 ± 0.8)角秒。使用宿主星系作为“标准烛光”,我们得出S5 0716+714的宿主星系z = 0.31 +- 0.08(1 sigma误差)。这个红移与光谱学测定的3个靠近S5 0716+714的星系的红移z = 0.26一致。z = 0.31时的有效半径为12 +- 4 kpc,这与BL Lac宿主星系的数值一致。在相同时期期间获取的光谱不显示可识别的谱线。

英文摘要:

We have acquired a deep i-band image of the BL Lacertae object S5 0716+714 while the target was in an low optical state. Due to the faintness of the nucleus, we were able to detect the underlying host galaxy. The host galaxy is measured to have an I-band magnitude of 17.5 +- 0.5 and an effective radius of (2.7 +- 0.8) arcsec. Using the host galaxy as a ``standard candle'', we derive z = 0.31 +- 0.08 (1 sigma error) for the host galaxy of S5 0716+714. This redshift is consistent with the redshift z = 0.26 determined by spectroscopy for 3 galaxies close to S5 0716+714. The effective radius at z = 0.31 would be 12 +- 4 kpc, which is consistent with values obtained for BL Lac host galaxies. An optical spectrum acquired during the same epoch shows no identifiable spectral lines.

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