论文标题
来自星系视差的哈勃常数的直接几何测量：Vera C. Rubin天文台和Nancy Grace Roman Space望远镜的预测
Direct geometrical measurement of the Hubble constant from galaxy parallax: predictions for the Vera C. Rubin Observatory and Nancy Grace Roman Space Telescope
论文作者
论文摘要
我们调查了由于地球框架（宇宙世俗视差）的运动引起的星系视差转移的统计检测，Vera C. rubin C. Rubin观察者的时空和时间（LSST）或Nancy Grace Roman Roman Roman Space望远镜（NGRST）可以进行。我们进行模拟的星系调查，从大型N体模拟中扩展到红移Z = 0.06，并包括来自LSST和NGRST科学要求，红移错误和特殊速度的天文误差。我们在基准情况下包括最亮星系的光谱红移（r <18）。对于各种假定的调查参数和分析技术，我们使用这些目录来对视差与红移进行测量。我们发现，为了进行竞争性测量，有必要为星系适当运动的特殊速度成分进行建模和校正。还必须将扩展源的天文统治推向新的制度，并结合来自已解决星系的不同元素的信息。在附录中，我们描述了一些对星系图像登记的简单测试，这些测试产生了相对有希望的结果。对于我们的基准调查参数，我们预测，LSST的直接几何测量H0的直接几何测量值为2.8％，而NGRST的RMS误差为2.8％。
We investigate the possibility that a statistical detection of the galaxy parallax shift due to the Earth's motion with respect to the CMB frame (cosmic secular parallax) could be made by the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) or by the Nancy Grace Roman Space Telescope (NGRST), and used to measure the Hubble constant. We make mock galaxy surveys which extend to redshift z=0.06 from a large N-body simulation, and include astrometric errors from the LSST and NGRST science requirements, redshift errors and peculiar velocities. We include spectroscopic redshifts for the brightest galaxies (r < 18) in the fiducial case. We use these catalogues to make measurements of parallax versus redshift,for various assumed survey parameters and analysis techniques. We find that in order to make a competitive measurement it will be necessary to model and correct for the peculiar velocity component of galaxy proper motions. It will also be necessary to push astrometry of extended sources into a new regime, and combine information from the different elements of resolved galaxies. In an appendix we describe some simple tests of galaxy image registration which yield relatively promising results. For our fiducial survey parameters, we predict an rms error on the direct geometrical measurement of H0 of 2.8% for LSST and 0.8% for NGRST.
