深度光学成像对RGB 0136+391和PKS 0735+178的红移约束
Redshift constraints for RGB 0136+391 and PKS 0735+178 from deep optical imaging
摘要：
我们提出了深I波段成像的两个BL撕裂对象，RGB 0136+391和PKS 0735+178，在一个时代的光学核是在一个微弱的状态，在这两个目标。在PKS 0735+178中，我们发现了一个明显超过点源的过剩，如果用de Vaucouleurs模型拟合，它对应于一个I = 18.64 ± 0.11和r_eff = 1.8 ± 0.4角秒的星系。将这个星系解释为PKS 0735+178的宿主星系，我们使用宿主星系作为“标准烛光”得出z = 0.45 +- 0.06。我们还讨论了PKS 0735+178的即时光学环境和Mg II吸收体在z = 0.424的身份。尽管最佳选择的时期和深度成像，我们发现RGB 0136+391的表面亮度轮廓与点源一致。通过模拟确定宿主星系亮度的下限，我们得出该目标的z > 0.40。
英文摘要：
We present the results of deep I-band imaging of two BL Lacerate objects, RGB 0136+391 and PKS 0735+178, during an epoch when the optical nucleus was in a faint state in both targets. In PKS 0735+178 we find a significant excess over a point source, which, if fitted by the de Vaucouleurs model, corresponds to a galaxy with I = 18.64 +- 0.11 and r_eff = 1.8 +- 0.4 arcsec. Interpreting this galaxy as the host galaxy of PKS 0735+178 we derive z = 0.45 +- 0.06 using the host galaxy as a "standard candle". We also discuss the immediate optical environment of PKS 0735+178 and the identity of the MgII absorber at z = 0.424. Despite of the optimally chosen epoch and deep imaging we find the surface brightness profile of RGB 0136+391 to be consistent with a point source. By determining a lower limit for the host galaxy brightness by simulations, we derive z > 0.40 for this target.
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