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arXiv 1109.0627astro-ph.CO
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蝎虎座BL天体1 ES 0647+250的宿主星系及其成像红移

The host galaxy of the BL Lacertae object 1ES 0647+250 and its imaging redshift

J. K. Kotilainen, T. Hyvönen, R. Falomo, A. Treves, M. Uslenghi

摘要:

由于没有光谱红移是可用于显着的BL Lac对象1 ES 0647+250,我们的目标是从它的宿主galaxy.We获得了深,高分辨率的近红外H波段图像的BL Lacertae对象1 ES 0647+250的属性,它的距离的估计。我们能够在近红外波段探测到下面的宿主星系。宿主星系的H波段星等为16.9+-0.2,有效半径为1.6+-0.3弧秒。使用Sbarufatti等人(2005)的成像红移方法,我们估计红移z = 0.41+-0.06。这一红移与Meisner & Romani(2010)先前报道的光学i '带的成像红移估计值(z = 0.45+-0.08)以及先前报道的红移下限一致。它也符合其伽马射线发射的限制。在近红外成像搜索,即使是中等大小的望远镜,在未知的红移BL Lac对象的宿主星系,鼓励,以及光谱1 ES 0647+250与大型望远镜,以确定其光谱红移。

英文摘要:

Since no spectroscopic redshift is available for the remarkable BL Lac object 1ES 0647+250, we aim to derive an estimate of its distance from the properties of its host galaxy.We obtained a deep, high-resolution near-infrared H-band image of the BL Lacertae object 1ES 0647+250. We are able to detect the underlying host galaxy in the near-infrared. The host galaxy has an H-band magnitude of 16.9+-0.2 and an effective radius of 1.6+-0.3 arcsec. Using the imaging redshift method by Sbarufatti et al. (2005), we estimate a redshift z = 0.41+-0.06. This redshift is consistent with the previously reported imaging redshift estimate from the optical i'-band, z = 0.45+-0.08 by Meisner & Romani (2010), and with previously reported lower limits for the redshift. It is also in agreement with constraints from its gamma-ray emission. Imaging searches in the near-infrared, even with moderately sized telescopes, for the host galaxies of BL Lac objects at unknown redshift, are encouraged, as well as optical spectroscopy of 1ES 0647+250 with large telescopes to determine its spectroscopic redshift.

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